vm/math.p8: complete the sin and cos routines

Fixed by reintroducing splitting of comparison expression in if statements by using a temporary variable and/or register to precompute left/right values.

.idea/libraries/io_kotest_assertions_core_jvm.xml

@@ -1,21 +1,21 @@
 <component name="libraryTable">
   <library name="io.kotest.assertions.core.jvm" type="repository">
-    <properties maven-id="io.kotest:kotest-assertions-core-jvm:5.2.3" />
+    <properties maven-id="io.kotest:kotest-assertions-core-jvm:5.3.2" />
     <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/5.2.3/kotest-assertions-core-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/5.3.2/kotest-assertions-core-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.10/kotlin-stdlib-jdk8-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.21/kotlin-stdlib-jdk8-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.10/kotlin-stdlib-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.21/kotlin-stdlib-1.6.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.10/kotlin-stdlib-jdk7-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.21/kotlin-stdlib-jdk7-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.2.3/kotest-assertions-shared-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.3.2/kotest-assertions-shared-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.11/java-diff-utils-4.11.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.6.1/kotlinx-coroutines-jdk8-1.6.1.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.10/kotlin-reflect-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.21/kotlin-reflect-1.6.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.6.1/kotlinx-coroutines-core-jvm-1.6.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.6.0/kotlin-stdlib-common-1.6.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.2.3/kotest-common-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.3.2/kotest-common-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.2.3/kotest-assertions-api-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.3.2/kotest-assertions-api-jvm-5.3.2.jar!/" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />

.idea/libraries/io_kotest_property_jvm.xml

@@ -1,20 +1,20 @@
 <component name="libraryTable">
   <library name="io.kotest.property.jvm" type="repository">
-    <properties maven-id="io.kotest:kotest-property-jvm:5.2.3" />
+    <properties maven-id="io.kotest:kotest-property-jvm:5.3.2" />
     <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-property-jvm/5.2.3/kotest-property-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-property-jvm/5.3.2/kotest-property-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/com/github/curious-odd-man/rgxgen/1.3/rgxgen-1.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.10/kotlin-stdlib-jdk8-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.21/kotlin-stdlib-jdk8-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.10/kotlin-stdlib-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.21/kotlin-stdlib-1.6.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.10/kotlin-stdlib-jdk7-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.21/kotlin-stdlib-jdk7-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.2.3/kotest-common-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.3.2/kotest-common-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.2.3/kotest-assertions-shared-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.3.2/kotest-assertions-shared-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.2.3/kotest-assertions-api-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.3.2/kotest-assertions-api-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.6.1/kotlinx-coroutines-jdk8-1.6.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.11/java-diff-utils-4.11.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.10/kotlin-reflect-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.21/kotlin-reflect-1.6.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.6.1/kotlinx-coroutines-core-jvm-1.6.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.6.0/kotlin-stdlib-common-1.6.0.jar!/" />
     </CLASSES>

.idea/libraries/io_kotest_runner_junit5_jvm.xml

@@ -1,38 +1,38 @@
 <component name="libraryTable">
   <library name="io.kotest.runner.junit5.jvm" type="repository">
-    <properties maven-id="io.kotest:kotest-runner-junit5-jvm:5.2.3" />
+    <properties maven-id="io.kotest:kotest-runner-junit5-jvm:5.3.2" />
     <CLASSES>
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-runner-junit5-jvm/5.2.3/kotest-runner-junit5-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-runner-junit5-jvm/5.3.2/kotest-runner-junit5-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-api-jvm/5.2.3/kotest-framework-api-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-api-jvm/5.3.2/kotest-framework-api-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.2.3/kotest-assertions-shared-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/5.3.2/kotest-assertions-shared-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.11/java-diff-utils-4.11.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-test-jvm/1.6.1/kotlinx-coroutines-test-jvm-1.6.1.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.2.3/kotest-common-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/5.3.2/kotest-common-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-engine-jvm/5.2.3/kotest-framework-engine-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-engine-jvm/5.3.2/kotest-framework-engine-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/github/classgraph/classgraph/4.8.138/classgraph-4.8.138.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/github/classgraph/classgraph/4.8.146/classgraph-4.8.146.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/com/github/ajalt/mordant/1.2.1/mordant-1.2.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/com/github/ajalt/colormath/1.2.0/colormath-1.2.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-debug/1.6.1/kotlinx-coroutines-debug-1.6.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/net/java/dev/jna/jna/5.9.0/jna-5.9.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/net/java/dev/jna/jna-platform/5.9.0/jna-platform-5.9.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-discovery-jvm/5.2.3/kotest-framework-discovery-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-discovery-jvm/5.3.2/kotest-framework-discovery-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/5.2.3/kotest-assertions-core-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/5.3.2/kotest-assertions-core-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.6.1/kotlinx-coroutines-jdk8-1.6.1.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.2.3/kotest-assertions-api-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/5.3.2/kotest-assertions-api-jvm-5.3.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-extensions-jvm/5.2.3/kotest-extensions-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-extensions-jvm/5.3.2/kotest-extensions-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/commons-io/commons-io/2.11.0/commons-io-2.11.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk/1.12.2/mockk-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk/1.12.3/mockk-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl-jvm/1.12.2/mockk-dsl-jvm-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-common/1.12.3/mockk-common-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl/1.12.2/mockk-dsl-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl/1.12.3/mockk-dsl-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-common/1.12.2/mockk-common-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl-jvm/1.12.3/mockk-dsl-jvm-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-jvm/1.12.2/mockk-agent-jvm-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-jvm/1.12.3/mockk-agent-jvm-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-api/1.12.2/mockk-agent-api-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-api/1.12.3/mockk-agent-api-1.12.3.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-common/1.12.2/mockk-agent-common-1.12.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-common/1.12.3/mockk-agent-common-1.12.3.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/objenesis/objenesis/3.1/objenesis-3.1.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy/1.12.5/byte-buddy-1.12.5.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy/1.12.6/byte-buddy-1.12.6.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy-agent/1.12.5/byte-buddy-agent-1.12.5.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy-agent/1.12.6/byte-buddy-agent-1.12.6.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-concurrency-jvm/5.2.3/kotest-framework-concurrency-jvm-5.2.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-concurrency-jvm/5.3.2/kotest-framework-concurrency-jvm-5.3.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.6.1/kotlinx-coroutines-core-jvm-1.6.1.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.6.0/kotlin-stdlib-common-1.6.0.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.7.2/junit-platform-engine-1.7.2.jar!/" />
@@ -41,11 +41,11 @@
       <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-suite-api/1.7.2/junit-platform-suite-api-1.7.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-launcher/1.7.2/junit-platform-launcher-1.7.2.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.7.2/junit-jupiter-api-5.7.2.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.10/kotlin-stdlib-jdk8-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.6.21/kotlin-stdlib-jdk8-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.10/kotlin-stdlib-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.6.21/kotlin-stdlib-1.6.21.jar!/" />
       <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.10/kotlin-stdlib-jdk7-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.6.21/kotlin-stdlib-jdk7-1.6.21.jar!/" />
-      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.10/kotlin-reflect-1.6.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.6.21/kotlin-reflect-1.6.21.jar!/" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />

.idea/misc.xml

@@ -19,7 +19,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <type id="Python" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

.idea/modules.xml

@@ -2,10 +2,10 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/codeAst/codeAst.iml" filepath="$PROJECT_DIR$/codeAst/codeAst.iml" />
       <module fileurl="file://$PROJECT_DIR$/codeCore/codeCore.iml" filepath="$PROJECT_DIR$/codeCore/codeCore.iml" />
       <module fileurl="file://$PROJECT_DIR$/codeGenCpu6502/codeGenCpu6502.iml" filepath="$PROJECT_DIR$/codeGenCpu6502/codeGenCpu6502.iml" />
       <module fileurl="file://$PROJECT_DIR$/codeGenExperimental/codeGenExperimental.iml" filepath="$PROJECT_DIR$/codeGenExperimental/codeGenExperimental.iml" />
+      <module fileurl="file://$PROJECT_DIR$/codeGenIntermediate/codeGenIntermediate.iml" filepath="$PROJECT_DIR$/codeGenIntermediate/codeGenIntermediate.iml" />
       <module fileurl="file://$PROJECT_DIR$/codeGenVirtual/codeGenVirtual.iml" filepath="$PROJECT_DIR$/codeGenVirtual/codeGenVirtual.iml" />
       <module fileurl="file://$PROJECT_DIR$/codeOptimizers/codeOptimizers.iml" filepath="$PROJECT_DIR$/codeOptimizers/codeOptimizers.iml" />
       <module fileurl="file://$PROJECT_DIR$/compiler/compiler.iml" filepath="$PROJECT_DIR$/compiler/compiler.iml" />
@@ -14,6 +14,7 @@
       <module fileurl="file://$PROJECT_DIR$/docs/docs.iml" filepath="$PROJECT_DIR$/docs/docs.iml" />
       <module fileurl="file://$PROJECT_DIR$/examples/examples.iml" filepath="$PROJECT_DIR$/examples/examples.iml" />
       <module fileurl="file://$PROJECT_DIR$/httpCompilerService/httpCompilerService.iml" filepath="$PROJECT_DIR$/httpCompilerService/httpCompilerService.iml" />
+      <module fileurl="file://$PROJECT_DIR$/intermediate/intermediate.iml" filepath="$PROJECT_DIR$/intermediate/intermediate.iml" />
       <module fileurl="file://$PROJECT_DIR$/parser/parser.iml" filepath="$PROJECT_DIR$/parser/parser.iml" />
       <module fileurl="file://$PROJECT_DIR$/virtualmachine/virtualmachine.iml" filepath="$PROJECT_DIR$/virtualmachine/virtualmachine.iml" />
     </modules>

codeCore/src/prog8/code/SymbolTable.kt

@@ -5,7 +5,7 @@ import prog8.code.core.*
 
 /**
  * Tree structure containing all symbol definitions in the program
- * (blocks, subroutines, variables (all types) and labels).
+ * (blocks, subroutines, variables (all types), memoryslabs, and labels).
  */
 class SymbolTable : StNode("", StNodeType.GLOBAL, Position.DUMMY) {
     fun print() = printIndented(0)
@@ -40,6 +40,24 @@ class SymbolTable : StNode("", StNodeType.GLOBAL, Position.DUMMY) {
         vars
     }
 
+    val allMemMappedVariables: Collection<StMemVar> by lazy {
+        val vars = mutableListOf<StMemVar>()
+        fun collect(node: StNode) {
+            for(child in node.children) {
+                if(child.value.type== StNodeType.MEMVAR)
+                    vars.add(child.value as StMemVar)
+                else
+                    collect(child.value)
+            }
+        }
+        collect(this)
+        vars
+    }
+
+    val allMemorySlabs: Collection<StMemorySlab> by lazy {
+        children.mapNotNull { if (it.value.type == StNodeType.MEMORYSLAB) it.value as StMemorySlab else null }
+    }
+
     override fun lookup(scopedName: List<String>) = flat[scopedName]
 }
 
@@ -54,7 +72,8 @@ enum class StNodeType {
     STATICVAR,
     MEMVAR,
     CONSTANT,
-    BUILTINFUNC
+    BUILTINFUNC,
+    MEMORYSLAB
 }
 
 
@@ -128,6 +147,7 @@ open class StNode(val name: String,
             StNodeType.LABEL -> print("(L) ")
             StNodeType.STATICVAR -> print("(V) ")
             StNodeType.MEMVAR -> print("(M) ")
+            StNodeType.MEMORYSLAB -> print("(MS) ")
             StNodeType.CONSTANT -> print("(C) ")
             StNodeType.BUILTINFUNC -> print("(F) ")
             StNodeType.ROMSUB -> print("(R) ")
@@ -149,26 +169,26 @@ open class StNode(val name: String,
 
 class StStaticVariable(name: String,
                        val dt: DataType,
-                       val initialNumericValue: Double?,
+                       val onetimeInitializationNumericValue: Double?,      // regular (every-run-time) initialization is done via regular assignments
-                       val initialStringValue: StString?,
+                       val onetimeInitializationStringValue: StString?,
-                       val initialArrayValue: StArray?,
+                       val onetimeInitializationArrayValue: StArray?,
                        val length: Int?,             // for arrays: the number of elements, for strings: number of characters *including* the terminating 0-byte
                        val zpwish: ZeropageWish,
                        position: Position) : StNode(name, StNodeType.STATICVAR, position) {
 
     init {
         if(length!=null) {
-            require(initialNumericValue == null)
+            require(onetimeInitializationNumericValue == null)
-            if(initialArrayValue!=null)
+            if(onetimeInitializationArrayValue!=null)
-                require(length == initialArrayValue.size)
+                require(length == onetimeInitializationArrayValue.size)
         }
-        if(initialNumericValue!=null)
+        if(onetimeInitializationNumericValue!=null)
             require(dt in NumericDatatypes)
-        if(initialArrayValue!=null)
+        if(onetimeInitializationArrayValue!=null)
             require(dt in ArrayDatatypes)
-        if(initialStringValue!=null) {
+        if(onetimeInitializationStringValue!=null) {
             require(dt == DataType.STR)
-            require(length == initialStringValue.first.length+1)
+            require(length == onetimeInitializationStringValue.first.length+1)
         }
     }
 
@@ -186,15 +206,31 @@ class StConstant(name: String, val dt: DataType, val value: Double, position: Po
 }
 
 
-class StMemVar(name: String, val dt: DataType, val address: UInt, position: Position) :
+class StMemVar(name: String,
+               val dt: DataType,
+               val address: UInt,
+               val length: Int?,             // for arrays: the number of elements, for strings: number of characters *including* the terminating 0-byte
+               position: Position) :
     StNode(name, StNodeType.MEMVAR, position) {
     override fun printProperties() {
         print("$name  dt=$dt address=${address.toHex()}")
     }
 }
 
+class StMemorySlab(
+    name: String,
+    val size: UInt,
+    val align: UInt,
+    val allocatedAddress: UInt? = null,     // this is used (for now) in the VM code generator. TODO remove this once no longer used
+    position: Position
+):
+    StNode(name, StNodeType.MEMORYSLAB, position) {
+    override fun printProperties() {
+        print("$name  size=$size  align=$align  address=$allocatedAddress")
+    }
+}
 
-class StSub(name: String, val parameters: List<StSubroutineParameter>, position: Position) :
+class StSub(name: String, val parameters: List<StSubroutineParameter>, val returnType: DataType?, position: Position) :
         StNode(name, StNodeType.SUBROUTINE, position) {
     override fun printProperties() {
         print(name)
@@ -202,7 +238,11 @@ class StSub(name: String, val parameters: List<StSubroutineParameter>, position:
 }
 
 
-class StRomSub(name: String, val address: UInt, parameters: List<StSubroutineParameter>, position: Position) :
+class StRomSub(name: String,
+               val address: UInt,
+               val parameters: List<StRomSubParameter>,
+               val returns: List<RegisterOrStatusflag>,
+               position: Position) :
     StNode(name, StNodeType.ROMSUB, position) {
     override fun printProperties() {
         print("$name  address=${address.toHex()}")
@@ -211,6 +251,7 @@ class StRomSub(name: String, val address: UInt, parameters: List<StSubroutinePar
 
 
 class StSubroutineParameter(val name: String, val type: DataType)
+class StRomSubParameter(val register: RegisterOrStatusflag, val type: DataType)
 class StArrayElement(val number: Double?, val addressOf: List<String>?)
 
 typealias StString = Pair<String, Encoding>

codeCore/src/prog8/code/ast/AstBase.kt

@@ -3,7 +3,7 @@ package prog8.code.ast
 import prog8.code.core.*
 import java.nio.file.Path
 
-// New (work-in-progress) simplified AST for the code generator.
+// New simplified AST for the code generator.
 
 
 sealed class PtNode(val position: Position) {

codeCore/src/prog8/code/ast/AstExpressions.kt

@@ -8,6 +8,21 @@ import kotlin.math.round
 
 
 sealed class PtExpression(val type: DataType, position: Position) : PtNode(position) {
+
+    init {
+        if(type==DataType.BOOL)
+            throw IllegalArgumentException("bool should have become ubyte @$position")
+        if(type==DataType.UNDEFINED) {
+            @Suppress("LeakingThis")
+            when(this) {
+                is PtBuiltinFunctionCall -> { /* void function call */ }
+                is PtFunctionCall -> { /* void function call */ }
+                is PtIdentifier -> { /* non-variable identifier */ }
+                else -> throw IllegalArgumentException("type should be known @$position")
+            }
+        }
+    }
+
     override fun printProperties() {
         print(type)
     }
@@ -73,6 +88,7 @@ class PtBuiltinFunctionCall(val name: String,
 
 
 class PtBinaryExpression(val operator: String, type: DataType, position: Position): PtExpression(type, position) {
+    // note: "and", "or", "xor" do not occur anymore as operators. They've been replaced int the ast by their bitwise versions &, |, ^.
     val left: PtExpression
         get() = children[0] as PtExpression
     val right: PtExpression
@@ -126,10 +142,12 @@ class PtMemoryByte(position: Position) : PtExpression(DataType.UBYTE, position)
 class PtNumber(type: DataType, val number: Double, position: Position) : PtExpression(type, position) {
 
     init {
+        if(type==DataType.BOOL)
+            throw IllegalArgumentException("bool should have become ubyte @$position")
         if(type!=DataType.FLOAT) {
             val rounded = round(number)
             if (rounded != number)
-                throw IllegalArgumentException("refused rounding of float to avoid loss of precision")
+                throw IllegalArgumentException("refused rounding of float to avoid loss of precision @$position")
         }
     }
 
@@ -153,6 +171,12 @@ class PtPrefix(val operator: String, type: DataType, position: Position): PtExpr
     val value: PtExpression
         get() = children.single() as PtExpression
 
+    init {
+        // note: the "not" operator may no longer occur in the ast; not x should have been replaced with x==0
+        if(operator !in setOf("+", "-", "~"))
+            throw IllegalArgumentException("invalid prefix operator: $operator")
+    }
+
     override fun printProperties() {
         print(operator)
     }

codeCore/src/prog8/code/ast/AstStatements.kt

@@ -8,6 +8,7 @@ class PtAsmSub(
     val address: UInt?,
     val clobbers: Set<CpuRegister>,
     val parameters: List<Pair<PtSubroutineParameter, RegisterOrStatusflag>>,
+    val returnTypes: List<DataType>,    // TODO join with register as Pairs ?
     val retvalRegisters: List<RegisterOrStatusflag>,
     val inline: Boolean,
     position: Position

codeCore/src/prog8/code/core/CompilationOptions.kt

@@ -20,5 +20,8 @@ class CompilationOptions(val output: OutputType,
                          var asmQuiet: Boolean = false,
                          var asmListfile: Boolean = false,
                          var experimentalCodegen: Boolean = false,
-                         var outputDir: Path = Path("")
+                         var keepIR: Boolean = false,
+                         var evalStackBaseAddress: UInt? = null,
+                         var outputDir: Path = Path(""),
+                         var symbolDefs: Map<String, String> = emptyMap()
 )

codeCore/src/prog8/code/core/Enumerations.kt

@@ -6,12 +6,14 @@ enum class DataType {
     UWORD,              // pass by value
     WORD,               // pass by value
     FLOAT,              // pass by value
+    BOOL,               // pass by value
     STR,                // pass by reference
     ARRAY_UB,           // pass by reference
     ARRAY_B,            // pass by reference
     ARRAY_UW,           // pass by reference
     ARRAY_W,            // pass by reference
     ARRAY_F,            // pass by reference
+    ARRAY_BOOL,         // pass by reference
     UNDEFINED;
 
     /**
@@ -19,11 +21,12 @@ enum class DataType {
      */
     infix fun isAssignableTo(targetType: DataType) =
         when(this) {
-            UBYTE -> targetType.oneOf(UBYTE, WORD, UWORD, FLOAT)
+            BOOL -> targetType.oneOf(BOOL, BYTE, UBYTE, WORD, UWORD, FLOAT)
+            UBYTE -> targetType.oneOf(UBYTE, WORD, UWORD, FLOAT, BOOL)
             BYTE -> targetType.oneOf(BYTE, WORD, FLOAT)
             UWORD -> targetType.oneOf(UWORD, FLOAT)
             WORD -> targetType.oneOf(WORD, FLOAT)
-            FLOAT -> targetType == FLOAT
+            FLOAT -> targetType.oneOf(FLOAT)
             STR -> targetType.oneOf(STR, UWORD)
             in ArrayDatatypes -> targetType == this
             else -> false
@@ -109,18 +112,20 @@ enum class BranchCondition {
 }
 
 
-val ByteDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE)
+val ByteDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.BOOL)
 val WordDatatypes = arrayOf(DataType.UWORD, DataType.WORD)
-val IntegerDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD)
+val IntegerDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD, DataType.BOOL)
-val NumericDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD, DataType.FLOAT)
+val IntegerDatatypesNoBool = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD)
+val NumericDatatypes = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD, DataType.FLOAT, DataType.BOOL)
+val NumericDatatypesNoBool = arrayOf(DataType.UBYTE, DataType.BYTE, DataType.UWORD, DataType.WORD, DataType.FLOAT)
 val SignedDatatypes =  arrayOf(DataType.BYTE, DataType.WORD, DataType.FLOAT)
-val ArrayDatatypes = arrayOf(DataType.ARRAY_UB, DataType.ARRAY_B, DataType.ARRAY_UW, DataType.ARRAY_W, DataType.ARRAY_F)
+val ArrayDatatypes = arrayOf(DataType.ARRAY_UB, DataType.ARRAY_B, DataType.ARRAY_UW, DataType.ARRAY_W, DataType.ARRAY_F, DataType.ARRAY_BOOL)
 val StringlyDatatypes = arrayOf(DataType.STR, DataType.ARRAY_UB, DataType.ARRAY_B, DataType.UWORD)
 val IterableDatatypes = arrayOf(
     DataType.STR,
     DataType.ARRAY_UB, DataType.ARRAY_B,
     DataType.ARRAY_UW, DataType.ARRAY_W,
-    DataType.ARRAY_F
+    DataType.ARRAY_F, DataType.ARRAY_BOOL
 )
 val PassByValueDatatypes = NumericDatatypes
 val PassByReferenceDatatypes = IterableDatatypes
@@ -130,14 +135,16 @@ val ArrayToElementTypes = mapOf(
     DataType.ARRAY_UB to DataType.UBYTE,
     DataType.ARRAY_W to DataType.WORD,
     DataType.ARRAY_UW to DataType.UWORD,
-    DataType.ARRAY_F to DataType.FLOAT
+    DataType.ARRAY_F to DataType.FLOAT,
+    DataType.ARRAY_BOOL to DataType.BOOL
 )
 val ElementToArrayTypes = mapOf(
     DataType.BYTE to DataType.ARRAY_B,
     DataType.UBYTE to DataType.ARRAY_UB,
     DataType.WORD to DataType.ARRAY_W,
     DataType.UWORD to DataType.ARRAY_UW,
-    DataType.FLOAT to DataType.ARRAY_F
+    DataType.FLOAT to DataType.ARRAY_F,
+    DataType.BOOL to DataType.ARRAY_BOOL
 )
 val Cx16VirtualRegisters = arrayOf(
     RegisterOrPair.R0, RegisterOrPair.R1, RegisterOrPair.R2, RegisterOrPair.R3,

codeCore/src/prog8/code/core/IMachineDefinition.kt

@@ -3,11 +3,6 @@ package prog8.code.core
 import java.nio.file.Path
 
 
-interface IMachineFloat {
-    fun toDouble(): Double
-    fun makeFloatFillAsm(): String
-}
-
 enum class CpuType {
     CPU6502,
     CPU65c02,
@@ -18,8 +13,8 @@ interface IMachineDefinition {
     val FLOAT_MAX_NEGATIVE: Double
     val FLOAT_MAX_POSITIVE: Double
     val FLOAT_MEM_SIZE: Int
-    val ESTACK_LO: UInt
+    var ESTACK_LO: UInt
-    val ESTACK_HI: UInt
+    var ESTACK_HI: UInt
     val PROGRAM_LOAD_ADDRESS : UInt
 
     val opcodeNames: Set<String>
@@ -27,9 +22,14 @@ interface IMachineDefinition {
     val cpu: CpuType
 
     fun initializeZeropage(compilerOptions: CompilationOptions)
-    fun getFloat(num: Number): IMachineFloat
+    fun getFloatAsmBytes(num: Number): String
 
     fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String>
     fun launchEmulator(selectedEmulator: Int, programNameWithPath: Path)
     fun isIOAddress(address: UInt): Boolean
+    fun overrideEvalStack(evalStackBaseAddress: UInt) {
+        require(evalStackBaseAddress and 255u == 0u)
+        ESTACK_LO = evalStackBaseAddress
+        ESTACK_HI = evalStackBaseAddress + 256u
+    }
 }

codeCore/src/prog8/code/core/Operators.kt

@@ -1,10 +1,11 @@
 package prog8.code.core
 
-val AssociativeOperators = setOf("+", "*", "&", "|", "^", "or", "and", "xor", "==", "!=")
+val AssociativeOperators = setOf("+", "*", "&", "|", "^", "==", "!=")
 val ComparisonOperators = setOf("==", "!=", "<", ">", "<=", ">=")
-val AugmentAssignmentOperators = setOf("+", "-", "/", "*", "&", "|", "^", "<<", ">>", "%", "and", "or", "xor")
 val LogicalOperators = setOf("and", "or", "xor", "not")
-val BitwiseOperators = setOf("&", "|", "^")
+val AugmentAssignmentOperators = setOf("+", "-", "/", "*", "&", "|", "^", "<<", ">>", "%", "and", "or", "xor")
+val BitwiseOperators = setOf("&", "|", "^", "~")
+// val InvalidOperatorsForBoolean = setOf("+", "-", "*", "/", "%", "<<", ">>") + BitwiseOperators
 
 fun invertedComparisonOperator(operator: String) =
     when (operator) {

codeCore/src/prog8/code/core/Zeropage.kt

@@ -117,4 +117,6 @@ abstract class Zeropage(protected val options: CompilationOptions) {
         require(size>0)
         return free.containsAll((address until address+size.toUInt()).toList())
     }
+
+    abstract fun allocateCx16VirtualRegisters()
 }

codeCore/src/prog8/code/target/atari/AtariMachineDefinition.kt

@@ -15,12 +15,12 @@ class AtariMachineDefinition: IMachineDefinition {
     override val PROGRAM_LOAD_ADDRESS = 0x2000u
 
     // the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
-    override val ESTACK_LO = 0x1a00u     //  $1a00-$1aff inclusive      // TODO
+    override var ESTACK_LO = 0x1a00u     //  $1a00-$1aff inclusive      // TODO
-    override val ESTACK_HI = 0x1b00u     //  $1b00-$1bff inclusive      // TODO
+    override var ESTACK_HI = 0x1b00u     //  $1b00-$1bff inclusive      // TODO
 
     override lateinit var zeropage: Zeropage
 
-    override fun getFloat(num: Number) = TODO("float from number")
+    override fun getFloatAsmBytes(num: Number) = TODO("float asm bytes from number")
 
     override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
         return if (compilerOptions.output == OutputType.XEX)

codeCore/src/prog8/code/target/atari/AtariZeropage.kt

@@ -12,7 +12,6 @@ class AtariZeropage(options: CompilationOptions) : Zeropage(options) {
     override val SCRATCH_W1 = 0xcdu      // temp storage 1 for a word  $cd+$ce
     override val SCRATCH_W2 = 0xcfu      // temp storage 2 for a word  $cf+$d0        TODO is $d0 okay to use?
 
-
     init {
         if (options.floats && options.zeropage !in arrayOf(
                 ZeropageType.FLOATSAFE,
@@ -40,6 +39,14 @@ class AtariZeropage(options: CompilationOptions) : Zeropage(options) {
             }
         }
 
+        val distictFree = free.distinct()
+        free.clear()
+        free.addAll(distictFree)
+
         removeReservedFromFreePool()
     }
+
+    override fun allocateCx16VirtualRegisters() {
+        TODO("Not known if atari can put the virtual regs in ZP")
+    }
 }

codeCore/src/prog8/code/target/c128/C128MachineDefinition.kt

@@ -16,12 +16,12 @@ class C128MachineDefinition: IMachineDefinition {
     override val PROGRAM_LOAD_ADDRESS = 0x1c01u
 
     // the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
-    override val ESTACK_LO = 0x1a00u     //  $1a00-$1aff inclusive
+    override var ESTACK_LO = 0x1a00u     //  $1a00-$1aff inclusive
-    override val ESTACK_HI = 0x1b00u     //  $1b00-$1bff inclusive
+    override var ESTACK_HI = 0x1b00u     //  $1b00-$1bff inclusive
 
     override lateinit var zeropage: Zeropage
 
-    override fun getFloat(num: Number) = Mflpt5.fromNumber(num)
+    override fun getFloatAsmBytes(num: Number) = Mflpt5.fromNumber(num).makeFloatFillAsm()
 
     override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
         return if (compilerOptions.launcher == CbmPrgLauncherType.BASIC || compilerOptions.output == OutputType.PRG)

codeCore/src/prog8/code/target/c128/C128Zeropage.kt

@@ -38,6 +38,14 @@ class C128Zeropage(options: CompilationOptions) : Zeropage(options) {
             }
         }
 
+        val distictFree = free.distinct()
+        free.clear()
+        free.addAll(distictFree)
+
         removeReservedFromFreePool()
     }
+
+    override fun allocateCx16VirtualRegisters() {
+        TODO("Not known if C128 can put the virtual regs in ZP")
+    }
 }

codeCore/src/prog8/code/target/c64/C64MachineDefinition.kt

@@ -16,12 +16,12 @@ class C64MachineDefinition: IMachineDefinition {
     override val PROGRAM_LOAD_ADDRESS = 0x0801u
 
     // the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
-    override val ESTACK_LO = 0xce00u     //  $ce00-$ceff inclusive
+    override var ESTACK_LO = 0xce00u     //  $ce00-$ceff inclusive
-    override val ESTACK_HI = 0xcf00u     //  $ce00-$ceff inclusive
+    override var ESTACK_HI = 0xcf00u     //  $ce00-$ceff inclusive
 
     override lateinit var zeropage: Zeropage
 
-    override fun getFloat(num: Number) = Mflpt5.fromNumber(num)
+    override fun getFloatAsmBytes(num: Number) = Mflpt5.fromNumber(num).makeFloatFillAsm()
 
     override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
         return if (compilerOptions.launcher == CbmPrgLauncherType.BASIC || compilerOptions.output == OutputType.PRG)

codeCore/src/prog8/code/target/c64/C64Zeropage.kt

@@ -1,9 +1,6 @@
 package prog8.code.target.c64
 
-import prog8.code.core.CompilationOptions
+import prog8.code.core.*
-import prog8.code.core.InternalCompilerException
-import prog8.code.core.Zeropage
-import prog8.code.core.ZeropageType
 
 
 class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
@@ -29,10 +26,9 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
         } else {
             if (options.zeropage == ZeropageType.KERNALSAFE || options.zeropage == ZeropageType.FLOATSAFE) {
                 free.addAll(listOf(
-                        0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
+                        0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-                        0x16, 0x17, 0x18, 0x19, 0x1a,
+                        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-                        0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21,
+                        0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
-                        0x22, 0x23, 0x24, 0x25,
                         0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
                         0x47, 0x48, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x51, 0x52, 0x53,
                         0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
@@ -48,8 +44,8 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
             if (options.zeropage == ZeropageType.FLOATSAFE) {
                 // remove the zeropage locations used for floating point operations from the free list
                 free.removeAll(listOf(
-                        0x22, 0x23, 0x24, 0x25,
+                        0x03, 0x04, 0x10, 0x11, 0x12,
-                        0x10, 0x11, 0x12, 0x26, 0x27, 0x28, 0x29, 0x2a,
+                        0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
                         0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
                         0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
                         0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72,
@@ -60,7 +56,7 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
             if(options.zeropage!= ZeropageType.DONTUSE) {
                 // add the free Zp addresses
                 // these are valid for the C-64 but allow BASIC to keep running fully *as long as you don't use tape I/O*
-                free.addAll(listOf(0x04, 0x05, 0x06, 0x0a, 0x0e,
+                free.addAll(listOf(0x02, 0x03, 0x04, 0x05, 0x06, 0x0a, 0x0e,
                         0x92, 0x96, 0x9b, 0x9c, 0x9e, 0x9f, 0xa5, 0xa6,
                         0xb0, 0xb1, 0xbe, 0xbf, 0xf9).map{it.toUInt()})
             } else {
@@ -69,6 +65,32 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
             }
         }
 
+        val distictFree = free.distinct()
+        free.clear()
+        free.addAll(distictFree)
+
         removeReservedFromFreePool()
+
+        if(options.zeropage==ZeropageType.FULL || options.zeropage==ZeropageType.KERNALSAFE) {
+            // in these cases there is enough space on the zero page to stick the cx16 virtual registers in there as well.
+            allocateCx16VirtualRegisters()
+        }
+    }
+
+    override fun allocateCx16VirtualRegisters() {
+        // Note: the 16 virtual registers R0-R15 are not regular allocated variables, they're *memory mapped* elsewhere to fixed addresses.
+        // However, to be able for the compiler to "see" them as zero page variables, we have to register them here as well.
+        // This is important because the compiler sometimes treats ZP variables more efficiently (for example if it's a pointer)
+        // The base addres is $04.  Unfortunately it cannot be the same as on the Commander X16 ($02).
+        for(reg in 0..15) {
+            allocatedVariables[listOf("cx16", "r${reg}")]   = ZpAllocation((4+reg*2).toUInt(), DataType.UWORD, 2)       // cx16.r0 .. cx16.r15
+            allocatedVariables[listOf("cx16", "r${reg}s")]  = ZpAllocation((4+reg*2).toUInt(), DataType.WORD, 2)        // cx16.r0s .. cx16.r15s
+            allocatedVariables[listOf("cx16", "r${reg}L")]  = ZpAllocation((4+reg*2).toUInt(), DataType.UBYTE, 1)       // cx16.r0L .. cx16.r15L
+            allocatedVariables[listOf("cx16", "r${reg}H")]  = ZpAllocation((5+reg*2).toUInt(), DataType.UBYTE, 1)       // cx16.r0H .. cx16.r15H
+            allocatedVariables[listOf("cx16", "r${reg}sL")] = ZpAllocation((4+reg*2).toUInt(), DataType.BYTE, 1)        // cx16.r0sL .. cx16.r15sL
+            allocatedVariables[listOf("cx16", "r${reg}sH")] = ZpAllocation((5+reg*2).toUInt(), DataType.BYTE, 1)        // cx16.r0sH .. cx16.r15sH
+            free.remove((4+reg*2).toUInt())
+            free.remove((5+reg*2).toUInt())
+        }
     }
 }

codeCore/src/prog8/code/target/cbm/Mflpt5.kt

@@ -1,12 +1,11 @@
 package prog8.code.target.cbm
 
-import prog8.code.core.IMachineFloat
 import prog8.code.core.InternalCompilerException
 import kotlin.math.absoluteValue
 import kotlin.math.pow
 
 
-data class Mflpt5(val b0: UByte, val b1: UByte, val b2: UByte, val b3: UByte, val b4: UByte): IMachineFloat {
+data class Mflpt5(val b0: UByte, val b1: UByte, val b2: UByte, val b3: UByte, val b4: UByte) {
 
     companion object {
         const val FLOAT_MAX_POSITIVE = 1.7014118345e+38         // bytes: 255,127,255,255,255
@@ -58,7 +57,7 @@ data class Mflpt5(val b0: UByte, val b1: UByte, val b2: UByte, val b3: UByte, va
         }
     }
 
-    override fun toDouble(): Double {
+    fun toDouble(): Double {
         if (this == zero) return 0.0
         val exp = b0.toInt() - 128
         val sign = (b1.toInt() and 0x80) > 0
@@ -67,7 +66,7 @@ data class Mflpt5(val b0: UByte, val b1: UByte, val b2: UByte, val b3: UByte, va
         return if (sign) -result else result
     }
 
-    override fun makeFloatFillAsm(): String {
+    fun makeFloatFillAsm(): String {
         val b0 = "$" + b0.toString(16).padStart(2, '0')
         val b1 = "$" + b1.toString(16).padStart(2, '0')
         val b2 = "$" + b2.toString(16).padStart(2, '0')

codeCore/src/prog8/code/target/cx16/CX16MachineDefinition.kt

@@ -15,12 +15,12 @@ class CX16MachineDefinition: IMachineDefinition {
     override val PROGRAM_LOAD_ADDRESS = 0x0801u
 
     // the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
-    override val ESTACK_LO = 0x0400u        //  $0400-$04ff inclusive
+    override var ESTACK_LO = 0x0400u        //  $0400-$04ff inclusive
-    override val ESTACK_HI = 0x0500u        //  $0500-$05ff inclusive
+    override var ESTACK_HI = 0x0500u        //  $0500-$05ff inclusive
 
     override lateinit var zeropage: Zeropage
 
-    override fun getFloat(num: Number) = Mflpt5.fromNumber(num)
+    override fun getFloatAsmBytes(num: Number) = Mflpt5.fromNumber(num).makeFloatFillAsm()
     override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
         return if (compilerOptions.launcher == CbmPrgLauncherType.BASIC || compilerOptions.output == OutputType.PRG)
             listOf("syslib")

codeCore/src/prog8/code/target/cx16/CX16Zeropage.kt

@@ -43,10 +43,20 @@ class CX16Zeropage(options: CompilationOptions) : Zeropage(options) {
                 else -> throw InternalCompilerException("for this machine target, zero page type 'floatsafe' is not available. ${options.zeropage}")
             }
 
+            val distictFree = free.distinct()
+            free.clear()
+            free.addAll(distictFree)
+
             removeReservedFromFreePool()
 
-            // note: the 16 virtual registers R0-R15 are not regular allocated variables, they're *memory mapped* elsewhere to fixed addresses.
+            allocateCx16VirtualRegisters()
-            // however, to be able for the compiler to "see" them as zero page variables, we have to register them here as well.
+        }
+    }
+
+    override fun allocateCx16VirtualRegisters() {
+        // Note: the 16 virtual registers R0-R15 are not regular allocated variables, they're *memory mapped* elsewhere to fixed addresses.
+        // However, to be able for the compiler to "see" them as zero page variables, we have to register them here as well.
+        // This is important because the compiler sometimes treats ZP variables more efficiently (for example if it's a pointer)
         for(reg in 0..15) {
             allocatedVariables[listOf("cx16", "r${reg}")]   = ZpAllocation((2+reg*2).toUInt(), DataType.UWORD, 2)       // cx16.r0 .. cx16.r15
             allocatedVariables[listOf("cx16", "r${reg}s")]  = ZpAllocation((2+reg*2).toUInt(), DataType.WORD, 2)        // cx16.r0s .. cx16.r15s
@@ -57,4 +67,3 @@ class CX16Zeropage(options: CompilationOptions) : Zeropage(options) {
         }
     }
 }
-}

codeCore/src/prog8/code/target/virtual/VirtualMachineDefinition.kt

@@ -6,6 +6,8 @@ import prog8.code.core.IMachineDefinition
 import prog8.code.core.Zeropage
 import java.io.File
 import java.nio.file.Path
+import kotlin.io.path.name
+import kotlin.io.path.readText
 
 
 class VirtualMachineDefinition: IMachineDefinition {
@@ -17,12 +19,12 @@ class VirtualMachineDefinition: IMachineDefinition {
     override val FLOAT_MEM_SIZE = 4             // 32-bits floating point
     override val PROGRAM_LOAD_ADDRESS = 0u      // not actually used
 
-    override val ESTACK_LO = 0u                 // not actually used
+    override var ESTACK_LO = 0u                 // not actually used
-    override val ESTACK_HI = 0u                 // not actually used
+    override var ESTACK_HI = 0u                 // not actually used
 
     override lateinit var zeropage: Zeropage     // not actually used
 
-    override fun getFloat(num: Number) = TODO("float from number")
+    override fun getFloatAsmBytes(num: Number) = TODO("float asm bytes from number")
 
     override fun importLibs(compilerOptions: CompilationOptions, compilationTargetName: String): List<String> {
         return listOf("syslib")
@@ -32,9 +34,16 @@ class VirtualMachineDefinition: IMachineDefinition {
         println("\nStarting Virtual Machine...")
         // to not have external module dependencies we launch the virtual machine via reflection
         val vm = Class.forName("prog8.vm.VmRunner").getDeclaredConstructor().newInstance() as IVirtualMachineRunner
-        val source = File("$programNameWithPath.p8virt").readText()
+        val filename = programNameWithPath.name
+        if(filename.endsWith(".p8virt")) {
+            vm.runProgram(programNameWithPath.readText(), true)
+        } else if(File("$filename.p8virt").isFile) {
+            val source = File("$filename.p8virt").readText()
             vm.runProgram(source, true)
         }
+        else
+            throw IllegalArgumentException("vm can only run .p8virt or .p8ir files")
+    }
 
     override fun isIOAddress(address: UInt): Boolean = false
 

codeGenCpu6502/build.gradle

@@ -24,7 +24,6 @@ compileTestKotlin {
 }
 
 dependencies {
-    implementation project(':codeAst')
     implementation project(':codeCore')
     implementation project(':compilerAst')
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"

codeGenCpu6502/codeGenCpu6502.iml

@@ -9,7 +9,6 @@
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
-    <orderEntry type="module" module-name="codeAst" />
     <orderEntry type="module" module-name="codeCore" />
     <orderEntry type="module" module-name="compilerAst" />
     <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />

codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt

@@ -8,6 +8,7 @@ import prog8.ast.Program
 import prog8.ast.base.FatalAstException
 import prog8.ast.expressions.*
 import prog8.ast.statements.*
+import prog8.code.StMemorySlab
 import prog8.code.SymbolTable
 import prog8.code.core.*
 import prog8.codegen.cpu6502.assignment.*
@@ -18,7 +19,6 @@ import kotlin.io.path.Path
 import kotlin.io.path.writeLines
 
 
-internal const val generatedLabelPrefix = "prog8_label_"
 internal const val subroutineFloatEvalResultVar1 = "prog8_float_eval_result1"
 internal const val subroutineFloatEvalResultVar2 = "prog8_float_eval_result2"
 
@@ -73,13 +73,6 @@ class AsmGen(internal val program: Program,
 
     internal fun isTargetCpu(cpu: CpuType) = options.compTarget.machine.cpu == cpu
 
-    private var generatedLabelSequenceNumber: Int = 0
-
-    internal fun makeLabel(postfix: String): String {
-        generatedLabelSequenceNumber++
-        return "${generatedLabelPrefix}${generatedLabelSequenceNumber}_$postfix"
-    }
-
     internal fun outputSourceLine(node: Node) {
         out(" ;\tsrc line: ${node.position.file}:${node.position.line}")
     }
@@ -319,13 +312,12 @@ class AsmGen(internal val program: Program,
             is Subroutine -> programGen.translateSubroutine(stmt)
             is InlineAssembly -> translate(stmt)
             is BuiltinFunctionCallStatement -> builtinFunctionsAsmGen.translateFunctioncallStatement(stmt)
-            is FunctionCallStatement -> functioncallAsmGen.translateFunctionCallStatement(stmt)         // TODO try to remove this last usage of FunctionCallStatement node in the codegen.
+            is FunctionCallStatement -> functioncallAsmGen.translateFunctionCallStatement(stmt)
             is Assignment -> assignmentAsmGen.translate(stmt)
             is Jump -> {
                 val (asmLabel, indirect) = getJumpTarget(stmt)
                 jmp(asmLabel, indirect)
             }
-            is GoSub -> translate(stmt)
             is PostIncrDecr -> postincrdecrAsmGen.translate(stmt)
             is Label -> translate(stmt)
             is ConditionalBranch -> translate(stmt)
@@ -449,15 +441,9 @@ class AsmGen(internal val program: Program,
     internal fun saveXbeforeCall(functionCall: IFunctionCall)  =
             functioncallAsmGen.saveXbeforeCall(functionCall)
 
-    internal fun saveXbeforeCall(gosub: GoSub)  =
-            functioncallAsmGen.saveXbeforeCall(gosub)
-
     internal fun restoreXafterCall(functionCall: IFunctionCall) =
             functioncallAsmGen.restoreXafterCall(functionCall)
 
-    internal fun restoreXafterCall(gosub: GoSub) =
-            functioncallAsmGen.restoreXafterCall(gosub)
-
     internal fun translateNormalAssignment(assign: AsmAssignment) =
             assignmentAsmGen.translateNormalAssignment(assign)
 
@@ -543,7 +529,7 @@ class AsmGen(internal val program: Program,
             if(jump is Jump) {
                 translateCompareAndJumpIfTrue(booleanCondition, jump)
             } else {
-                val endLabel = makeLabel("if_end")
+                val endLabel = program.makeLabel("if_end")
                 translateCompareAndJumpIfFalse(booleanCondition, endLabel)
                 translate(stmt.truepart)
                 out(endLabel)
@@ -551,8 +537,8 @@ class AsmGen(internal val program: Program,
         }
         else {
             // both true and else parts
-            val elseLabel = makeLabel("if_else")
+            val elseLabel = program.makeLabel("if_else")
-            val endLabel = makeLabel("if_end")
+            val endLabel = program.makeLabel("if_end")
             translateCompareAndJumpIfFalse(booleanCondition, elseLabel)
             translate(stmt.truepart)
             jmp(endLabel)
@@ -568,7 +554,7 @@ class AsmGen(internal val program: Program,
     }
 
     private fun translate(stmt: RepeatLoop) {
-        val endLabel = makeLabel("repeatend")
+        val endLabel = program.makeLabel("repeatend")
         loopEndLabels.push(endLabel)
 
         when (stmt.iterations) {
@@ -621,7 +607,7 @@ class AsmGen(internal val program: Program,
 
     private fun repeatWordCount(count: Int, stmt: RepeatLoop) {
         require(count in 257..65535)
-        val repeatLabel = makeLabel("repeat")
+        val repeatLabel = program.makeLabel("repeat")
         if(isTargetCpu(CpuType.CPU65c02)) {
             val counterVar = createRepeatCounterVar(DataType.UWORD, true, stmt)
             out("""
@@ -662,7 +648,7 @@ $repeatLabel""")
     private fun repeatWordCountInAY(endLabel: String, stmt: RepeatLoop) {
         // note: A/Y must have been loaded with the number of iterations!
         // no need to explicitly test for 0 iterations as this is done in the countdown logic below
-        val repeatLabel = makeLabel("repeat")
+        val repeatLabel = program.makeLabel("repeat")
         val counterVar = createRepeatCounterVar(DataType.UWORD, false, stmt)
         out("""
                 sta  $counterVar
@@ -683,7 +669,7 @@ $repeatLabel    lda  $counterVar
 
     private fun repeatByteCount(count: Int, stmt: RepeatLoop) {
         require(count in 2..256)
-        val repeatLabel = makeLabel("repeat")
+        val repeatLabel = program.makeLabel("repeat")
         if(isTargetCpu(CpuType.CPU65c02)) {
             val counterVar = createRepeatCounterVar(DataType.UBYTE, true, stmt)
             out("  lda  #${count and 255} |  sta  $counterVar")
@@ -701,7 +687,7 @@ $repeatLabel    lda  $counterVar
 
     private fun repeatCountInY(stmt: RepeatLoop, endLabel: String) {
         // note: Y must just have been loaded with the (variable) number of loops to be performed!
-        val repeatLabel = makeLabel("repeat")
+        val repeatLabel = program.makeLabel("repeat")
         if(isTargetCpu(CpuType.CPU65c02)) {
             val counterVar = createRepeatCounterVar(DataType.UBYTE, true, stmt)
             out("  beq  $endLabel |  sty  $counterVar")
@@ -738,7 +724,7 @@ $repeatLabel    lda  $counterVar
             }
         }
 
-        val counterVar = makeLabel("counter")
+        val counterVar = program.makeLabel("counter")
         when(dt) {
             DataType.UBYTE, DataType.UWORD -> {
                 val result = zeropage.allocate(listOf(counterVar), dt, null, stmt.position, errors)
@@ -753,7 +739,7 @@ $repeatLabel    lda  $counterVar
     }
 
     private fun translate(stmt: When) {
-        val endLabel = makeLabel("choice_end")
+        val endLabel = program.makeLabel("choice_end")
         val choiceBlocks = mutableListOf<Pair<String, AnonymousScope>>()
         val conditionDt = stmt.condition.inferType(program)
         if(!conditionDt.isKnown)
@@ -764,7 +750,7 @@ $repeatLabel    lda  $counterVar
             assignExpressionToRegister(stmt.condition, RegisterOrPair.AY)
 
         for(choice in stmt.choices) {
-            val choiceLabel = makeLabel("choice")
+            val choiceLabel = program.makeLabel("choice")
             if(choice.values==null) {
                 // the else choice
                 translate(choice.statements)
@@ -828,14 +814,14 @@ $repeatLabel    lda  $counterVar
         } else {
             if(stmt.elsepart.isEmpty()) {
                 val instruction = branchInstruction(stmt.condition, true)
-                val elseLabel = makeLabel("branch_else")
+                val elseLabel = program.makeLabel("branch_else")
                 out("  $instruction  $elseLabel")
                 translate(stmt.truepart)
                 out(elseLabel)
             } else {
                 val instruction = branchInstruction(stmt.condition, true)
-                val elseLabel = makeLabel("branch_else")
+                val elseLabel = program.makeLabel("branch_else")
-                val endLabel = makeLabel("branch_end")
+                val endLabel = program.makeLabel("branch_end")
                 out("  $instruction  $elseLabel")
                 translate(stmt.truepart)
                 jmp(endLabel)
@@ -880,18 +866,6 @@ $repeatLabel    lda  $counterVar
         }
     }
 
-    private fun translate(gosub: GoSub) {
-        val tgt = gosub.identifier.targetSubroutine(program)
-        if(tgt!=null && tgt.isAsmSubroutine) {
-            // no need to rescue X , this has been taken care of already
-            out("  jsr  ${getJumpTarget(gosub)}")
-        } else {
-            saveXbeforeCall(gosub)
-            out("  jsr  ${getJumpTarget(gosub)}")
-            restoreXafterCall(gosub)
-        }
-    }
-
     private fun getJumpTarget(jump: Jump): Pair<String, Boolean> {
         val ident = jump.identifier
         val label = jump.generatedLabel
@@ -911,8 +885,6 @@ $repeatLabel    lda  $counterVar
         }
     }
 
-    private fun getJumpTarget(gosub: GoSub): String = asmSymbolName(gosub.identifier)
-
     private fun translate(ret: Return, withRts: Boolean=true) {
         ret.value?.let { returnvalue ->
             val sub = ret.definingSubroutine!!
@@ -1173,14 +1145,14 @@ $repeatLabel    lda  $counterVar
             return testVariableZeroAndJump(left, dt, operator, jumpIfFalseLabel)
 
         when(dt) {
-            DataType.UBYTE, DataType.UWORD -> {
+            DataType.BOOL, DataType.UBYTE, DataType.UWORD -> {
                 if(operator=="<") {
                     out("  jmp  $jumpIfFalseLabel")
                     return
                 } else if(operator==">=") {
                     return
                 }
-                if(dt==DataType.UBYTE) {
+                if(dt==DataType.UBYTE || dt==DataType.BOOL) {
                     assignExpressionToRegister(left, RegisterOrPair.A, false)
                     if (left is IFunctionCall && !left.isSimple)
                         out("  cmp  #0")
@@ -1260,7 +1232,7 @@ $repeatLabel    lda  $counterVar
         // optimized code if the expression is just an identifier (variable)
         val varname = asmVariableName(variable)
         when(dt) {
-            DataType.UBYTE -> when(operator) {
+            DataType.UBYTE, DataType.BOOL -> when(operator) {
                 "==" -> out("  lda  $varname |  bne  $jumpIfFalseLabel")
                 "!=" -> out("  lda  $varname |  beq  $jumpIfFalseLabel")
                 ">"  -> out("  lda  $varname |  beq  $jumpIfFalseLabel")
@@ -2882,7 +2854,7 @@ $repeatLabel    lda  $counterVar
                 }
             }
         } else {
-            val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, program, this, target.datatype, scope, variableAsmName = asmVariableName(target.name))
+            val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, this, target.datatype, scope, variableAsmName = asmVariableName(target.scopedName))
             if (dt in ByteDatatypes) {
                 out("  pla")
                 assignRegister(RegisterOrPair.A, tgt)
@@ -2925,6 +2897,12 @@ $repeatLabel    lda  $counterVar
         else
             extra
     }
+
+    fun addMemorySlab(name: String, size: UInt, align: UInt, position: Position): String {
+        val prefixedName = "prog8_memoryslab_$name"
+        symbolTable.add(StMemorySlab(prefixedName, size, align, null, position))
+        return prefixedName
+    }
 }
 
 

codeGenCpu6502/src/prog8/codegen/cpu6502/AsmOptimizer.kt

@@ -59,7 +59,14 @@ internal fun optimizeAssembly(lines: MutableList<String>, machine: IMachineDefin
         numberOfOptimizations++
     }
 
-    // TODO more assembly optimizations
+    mods = optimizeSamePointerIndexing(linesByFourteen, machine, program)
+    if(mods.isNotEmpty()) {
+        apply(mods, lines)
+        linesByFourteen = getLinesBy(lines, 14)
+        numberOfOptimizations++
+    }
+
+    // TODO more assembly peephole optimizations
 
     return numberOfOptimizations
 }
@@ -320,6 +327,48 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
     return mods
 }
 
+private fun optimizeSamePointerIndexing(linesByFourteen: List<List<IndexedValue<String>>>, machine: IMachineDefinition, program: Program): List<Modification> {
+
+    // Optimize same pointer indexing where for instance we load and store to the same ptr index in Y
+    // if Y isn't modified in between we can omit the second LDY:
+    //    ldy  #0
+    //    lda  (ptr),y
+    //    ora  #3       ; <-- instruction(s) that don't modify Y
+    //    ldy  #0       ; <-- can be removed
+    //    sta  (ptr),y
+
+    val mods = mutableListOf<Modification>()
+    for (lines in linesByFourteen) {
+        val first = lines[0].value.trimStart()
+        val second = lines[1].value.trimStart()
+        val third = lines[2].value.trimStart()
+        val fourth = lines[3].value.trimStart()
+        val fifth = lines[4].value.trimStart()
+        val sixth = lines[5].value.trimStart()
+
+        if(first.startsWith("ldy") && second.startsWith("lda") && fourth.startsWith("ldy") && fifth.startsWith("sta")) {
+            val firstvalue = first.substring(4)
+            val secondvalue = second.substring(4)
+            val fourthvalue = fourth.substring(4)
+            val fifthvalue = fifth.substring(4)
+            if("y" !in third && firstvalue==fourthvalue && secondvalue==fifthvalue && secondvalue.endsWith(",y") && fifthvalue.endsWith(",y")) {
+                mods.add(Modification(lines[3].index, true, null))
+            }
+        }
+        if(first.startsWith("ldy") && second.startsWith("lda") && fifth.startsWith("ldy") && sixth.startsWith("sta")) {
+            val firstvalue = first.substring(4)
+            val secondvalue = second.substring(4)
+            val fifthvalue = fifth.substring(4)
+            val sixthvalue = sixth.substring(4)
+            if("y" !in third && "y" !in fourth && firstvalue==fifthvalue && secondvalue==sixthvalue && secondvalue.endsWith(",y") && sixthvalue.endsWith(",y")) {
+                mods.add(Modification(lines[4].index, true, null))
+            }
+        }
+    }
+
+    return mods
+}
+
 private fun optimizeStoreLoadSame(linesByFour: List<List<IndexedValue<String>>>, machine: IMachineDefinition, program: Program): List<Modification> {
     // sta X + lda X,  sty X + ldy X,   stx X + ldx X  -> the second instruction can OFTEN be eliminated
     val mods = mutableListOf<Modification>()

codeGenCpu6502/src/prog8/codegen/cpu6502/AssemblyProgram.kt

@@ -3,6 +3,7 @@ package prog8.codegen.cpu6502
 import com.github.michaelbull.result.Ok
 import com.github.michaelbull.result.Result
 import com.github.michaelbull.result.mapError
+import prog8.ast.generatedLabelPrefix
 import prog8.code.core.*
 import java.io.File
 import java.nio.file.Path

codeGenCpu6502/src/prog8/codegen/cpu6502/BuiltinFunctionsAsmGen.kt

@@ -44,7 +44,6 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
             "abs" -> funcAbs(fcall, func, resultToStack, resultRegister, sscope)
             "any", "all" -> funcAnyAll(fcall, func, resultToStack, resultRegister, sscope)
             "sgn" -> funcSgn(fcall, func, resultToStack, resultRegister, sscope)
-            "boolean" -> funcBoolean(fcall, resultToStack, resultRegister, sscope)
             "rnd", "rndw" -> funcRnd(func, resultToStack, resultRegister, sscope)
             "sqrt16" -> funcSqrt16(fcall, func, resultToStack, resultRegister, sscope)
             "rol" -> funcRol(fcall)
@@ -140,20 +139,19 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
             throw AssemblyError("callfar only works on cx16 target at this time")
 
         val bank = fcall.args[0].constValue(program)?.number?.toInt()
-        val address = fcall.args[1].constValue(program)?.number?.toInt()
+        val address = fcall.args[1].constValue(program)?.number?.toInt() ?: 0
-        if(bank==null || address==null)
-            throw AssemblyError("callfar (jsrfar) requires constant arguments")
-
-        if(address !in 0xa000..0xbfff)
-            throw AssemblyError("callfar done on address outside of cx16 banked ram")
-        if(bank==0)
-            throw AssemblyError("callfar done on bank 0 which is reserved for the kernal")
-
         val argAddrArg = fcall.args[2]
+        if(bank==null)
+            throw AssemblyError("callfar (jsrfar) bank has to be a constant")
+        if(fcall.args[1].constValue(program) == null) {
+            assignAsmGen.assignExpressionToRegister(fcall.args[1], RegisterOrPair.AY, false)
+            asmgen.out("  sta  (+)+0 |  sty  (+)+1  ; store jsrfar address word")
+        }
+
         if(argAddrArg.constValue(program)?.number == 0.0) {
             asmgen.out("""
                 jsr  cx16.jsrfar
-                .word  ${address.toHex()}
++               .word  ${address.toHex()}
                 .byte  ${bank.toHex()}""")
         } else {
             when(argAddrArg) {
@@ -163,7 +161,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                     asmgen.out("""
                         lda  ${asmgen.asmVariableName(argAddrArg.identifier)}
                         jsr  cx16.jsrfar
-                        .word  ${address.toHex()}
++                       .word  ${address.toHex()}
                         .byte  ${bank.toHex()}
                         sta  ${asmgen.asmVariableName(argAddrArg.identifier)}""")
                 }
@@ -171,7 +169,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                     asmgen.out("""
                         lda  ${argAddrArg.number.toHex()}
                         jsr  cx16.jsrfar
-                        .word  ${address.toHex()}
++                       .word  ${address.toHex()}
                         .byte  ${bank.toHex()}
                         sta  ${argAddrArg.number.toHex()}""")
                 }
@@ -313,22 +311,17 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
         require(name.all { it.isLetterOrDigit() || it=='_' }) {"memory name should be a valid symbol name"}
         val size = (fcall.args[1] as NumericLiteral).number.toUInt()
         val align = (fcall.args[2] as NumericLiteral).number.toUInt()
-
+        val prefixedName = asmgen.addMemorySlab(name, size, align, fcall.position)
-        val existing = allocations.getMemorySlab(name)
+        val slabname = IdentifierReference(listOf("prog8_slabs", prefixedName), fcall.position)
-        if(existing!=null && (existing.first!=size || existing.second!=align))
-            throw AssemblyError("memory slab '$name' already exists with a different size or alignment at ${fcall.position}")
-
-        val slabname = IdentifierReference(listOf("prog8_slabs", name), fcall.position)
         slabname.linkParents(fcall)
         val src = AsmAssignSource(SourceStorageKind.EXPRESSION, program, asmgen, DataType.UWORD, expression = AddressOf(slabname, fcall.position))
         val target =
             if(resultToStack)
-                AsmAssignTarget(TargetStorageKind.STACK, program, asmgen, DataType.UWORD, null)
+                AsmAssignTarget(TargetStorageKind.STACK,  asmgen, DataType.UWORD, null)
             else
-                AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, null, program, asmgen)
+                AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, null, asmgen)
         val assign = AsmAssignment(src, target, false, program.memsizer, fcall.position)
         asmgen.translateNormalAssignment(assign)
-        allocations.allocateMemorySlab(name, size, align)
     }
 
     private fun funcSqrt16(fcall: IFunctionCall, func: FSignature, resultToStack: Boolean, resultRegister: RegisterOrPair?, scope: Subroutine?) {
@@ -337,7 +330,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
             asmgen.out("  jsr  prog8_lib.func_sqrt16_stack")
         else {
             asmgen.out("  jsr  prog8_lib.func_sqrt16_into_A")
-            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, program, asmgen), CpuRegister.A)
+            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, asmgen), CpuRegister.A)
         }
     }
 
@@ -650,7 +643,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                 DataType.FLOAT -> asmgen.out("  jsr  floats.func_sign_f_into_A")
                 else -> throw AssemblyError("weird type $dt")
             }
-            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, program, asmgen), CpuRegister.A)
+            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, asmgen), CpuRegister.A)
         }
     }
 
@@ -671,7 +664,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                 DataType.ARRAY_F -> asmgen.out("  jsr  floats.func_${function.name}_f_into_A |  ldy  #0")
                 else -> throw AssemblyError("weird type $dt")
             }
-            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, program, asmgen), CpuRegister.A)
+            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, asmgen), CpuRegister.A)
         }
     }
 
@@ -694,32 +687,10 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                 DataType.WORD -> asmgen.out("  jsr  prog8_lib.abs_w_into_AY")
                 else -> throw AssemblyError("weird type")
             }
-            assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, scope, program, asmgen), RegisterOrPair.AY)
+            assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, scope, asmgen), RegisterOrPair.AY)
         }
     }
 
-    private fun funcBoolean(fcall: IFunctionCall, resultToStack: Boolean, resultRegister: RegisterOrPair?, scope: Subroutine?) {
-        when (val dt = fcall.args.single().inferType(program).getOr(DataType.UNDEFINED)) {
-            in ByteDatatypes -> {
-                assignAsmGen.assignExpressionToRegister(fcall.args.single(), RegisterOrPair.A, dt==DataType.BYTE)
-            }
-            in WordDatatypes -> {
-                assignAsmGen.assignExpressionToRegister(fcall.args.single(), RegisterOrPair.AY, dt==DataType.WORD)
-                asmgen.out("  sty  P8ZP_SCRATCH_B1 |  ora  P8ZP_SCRATCH_B1")
-            }
-            DataType.FLOAT -> {
-                assignAsmGen.assignExpressionToRegister(fcall.args.single(), RegisterOrPair.FAC1, true)
-                asmgen.out("  jsr  floats.SIGN")
-            }
-            else -> throw AssemblyError("weird type")
-        }
-
-        if(resultToStack)
-            asmgen.out("  sta  P8ESTACK_LO,x |  dex")
-        else if(resultRegister!=null)
-            assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister, false, scope, program, asmgen), CpuRegister.A)
-    }
-
     private fun funcRnd(func: FSignature, resultToStack: Boolean, resultRegister: RegisterOrPair?, scope: Subroutine?) {
         when(func.name) {
             "rnd" -> {
@@ -727,7 +698,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                     asmgen.out("  jsr  prog8_lib.func_rnd_stack")
                 else {
                     asmgen.out("  jsr  math.randbyte")
-                    assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, program, asmgen), CpuRegister.A)
+                    assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, asmgen), CpuRegister.A)
                 }
             }
             "rndw" -> {
@@ -735,7 +706,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                     asmgen.out("  jsr  prog8_lib.func_rndw_stack")
                 else {
                     asmgen.out("  jsr  math.randword")
-                    assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, scope, program, asmgen), RegisterOrPair.AY)
+                    assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, scope, asmgen), RegisterOrPair.AY)
                 }
             }
             else -> throw AssemblyError("wrong func")
@@ -889,9 +860,9 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                 val mr0 = fcall.args[0] as? DirectMemoryRead
                 val mr1 = fcall.args[1] as? DirectMemoryRead
                 if (mr0 != null)
-                    needAsave =  mr0.addressExpression !is NumericLiteral && mr0.addressExpression !is IdentifierReference
+                    needAsave =  mr0.addressExpression !is NumericLiteral
                 if (mr1 != null)
-                    needAsave = needAsave or (mr1.addressExpression !is NumericLiteral && mr1.addressExpression !is IdentifierReference)
+                    needAsave = needAsave or (mr1.addressExpression !is NumericLiteral)
             }
             when(reg) {
                 RegisterOrPair.AX -> {
@@ -1108,7 +1079,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                             AsmAssignSource.fromAstSource(value, program, asmgen)
                         }
                     }
-                    val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, conv.dt, null, variableAsmName = varname)
+                    val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, conv.dt, null, variableAsmName = varname)
                     val assign = AsmAssignment(src, tgt, false, program.memsizer, value.position)
                     asmgen.translateNormalAssignment(assign)
                 }
@@ -1124,7 +1095,7 @@ internal class BuiltinFunctionsAsmGen(private val program: Program,
                             AsmAssignSource.fromAstSource(value, program, asmgen)
                         }
                     }
-                    val tgt = AsmAssignTarget.fromRegisters(conv.reg!!, false, null, program, asmgen)
+                    val tgt = AsmAssignTarget.fromRegisters(conv.reg!!, false, null, asmgen)
                     val assign = AsmAssignment(src, tgt, false, program.memsizer, value.position)
                     asmgen.translateNormalAssignment(assign)
                 }

codeGenCpu6502/src/prog8/codegen/cpu6502/ExpressionsAsmGen.kt

@@ -136,7 +136,7 @@ internal class ExpressionsAsmGen(private val program: Program,
     private fun translateExpression(typecast: TypecastExpression) {
         translateExpressionInternal(typecast.expression)
         when(typecast.expression.inferType(program).getOr(DataType.UNDEFINED)) {
-            DataType.UBYTE -> {
+            DataType.UBYTE, DataType.BOOL -> {
                 when(typecast.type) {
                     DataType.UBYTE, DataType.BYTE -> {}
                     DataType.UWORD, DataType.WORD -> {
@@ -520,11 +520,36 @@ internal class ExpressionsAsmGen(private val program: Program,
                     if(rightVal!=null && rightVal==2) {
                         translateExpressionInternal(expr.left)
                         when (leftDt) {
-                            DataType.UBYTE -> asmgen.out("  lsr  P8ESTACK_LO+1,x")
+                            DataType.UBYTE -> {
-                            DataType.BYTE -> asmgen.out("  lda  P8ESTACK_LO+1,x |  asl  a |  ror  P8ESTACK_LO+1,x")
+                                asmgen.out("  lsr  P8ESTACK_LO+1,x")
-                            DataType.UWORD -> asmgen.out("  lsr  P8ESTACK_HI+1,x |  ror  P8ESTACK_LO+1,x")
+                            }
-                            DataType.WORD -> asmgen.out("  lda  P8ESTACK_HI+1,x |  asl  a |  ror  P8ESTACK_HI+1,x |  ror  P8ESTACK_LO+1,x")
+                            DataType.UWORD -> {
-                            else -> throw AssemblyError("wrong dt")
+                                asmgen.out("  lsr  P8ESTACK_HI+1,x |  ror  P8ESTACK_LO+1,x")
+                            }
+                            DataType.BYTE -> {
+                                // signed divide using shift needs adjusting of negative value to get correct rounding towards zero
+                                asmgen.out("""
+                                    lda  P8ESTACK_LO+1,x
+                                    bpl  +
+                                    inc  P8ESTACK_LO+1,x
+                                    lda  P8ESTACK_LO+1,x
++                                   asl  a
+                                    ror  P8ESTACK_LO+1,x""")
+                            }
+                            DataType.WORD -> {
+                                // signed divide using shift needs adjusting of negative value to get correct rounding towards zero
+                                asmgen.out("""
+                                    lda  P8ESTACK_HI+1,x
+                                    bpl  ++
+                                    inc  P8ESTACK_LO+1,x
+                                    bne  +
+                                    inc  P8ESTACK_HI+1,x
++                                   lda  P8ESTACK_HI+1,x
++                                   asl  a
+                                    ror  P8ESTACK_HI+1,x
+                                    ror  P8ESTACK_LO+1,x""")
+                            }
+                            else -> throw AssemblyError("weird dt")
                         }
                         return
                     }
@@ -532,8 +557,8 @@ internal class ExpressionsAsmGen(private val program: Program,
             }
             in ComparisonOperators -> {
                 if(leftDt in NumericDatatypes && rightDt in NumericDatatypes) {
-                    val rightVal = expr.right.constValue(program)?.number?.toInt()
+                    val rightVal = expr.right.constValue(program)?.number
-                    if(rightVal==0)
+                    if(rightVal==0.0)
                         return translateComparisonWithZero(expr.left, leftDt, expr.operator)
                 }
             }
@@ -560,6 +585,42 @@ internal class ExpressionsAsmGen(private val program: Program,
     }
 
     private fun translateComparisonWithZero(expr: Expression, dt: DataType, operator: String) {
+        if(expr.isSimple) {
+            if(operator=="!=") {
+                when (dt) {
+                    in ByteDatatypes -> {
+                        asmgen.assignExpressionToRegister(expr, RegisterOrPair.A, dt == DataType.BYTE)
+                        asmgen.out("""
+                            beq  +
+                            lda  #1
++                           sta  P8ESTACK_LO,x
+                            dex""")
+                        return
+                    }
+                    in WordDatatypes -> {
+                        asmgen.assignExpressionToRegister(expr, RegisterOrPair.AY, dt == DataType.WORD)
+                        asmgen.out("""
+                            sty  P8ZP_SCRATCH_B1 
+                            ora  P8ZP_SCRATCH_B1
+                            beq  +
+                            lda  #1
++                           sta  P8ESTACK_LO,x
+                            dex""")
+                        return
+                    }
+                    DataType.FLOAT -> {
+                        asmgen.assignExpressionToRegister(expr, RegisterOrPair.FAC1, true)
+                        asmgen.out("""
+                            jsr  floats.SIGN
+                            sta  P8ESTACK_LO,x
+                            dex""")
+                        return
+                    }
+                    else -> {}
+                }
+            }
+            /* operator == is not worth it to special case, the code is mostly larger */
+        }
         translateExpressionInternal(expr)
         when(operator) {
             "==" -> {
@@ -664,22 +725,6 @@ internal class ExpressionsAsmGen(private val program: Program,
                     else -> throw AssemblyError("weird type")
                 }
             }
-            "not" -> {
-                when(type) {
-                    // if reg==0 ->
-                    /*
-        lda  P8ESTACK_LO+1,x
-		beq  +
-		lda  #1
-+		eor  #1
-		sta  P8ESTACK_LO+1,x
-		rts
-                     */
-                    in ByteDatatypes -> asmgen.out("  jsr  prog8_lib.not_byte")
-                    in WordDatatypes -> asmgen.out("  jsr  prog8_lib.not_word")
-                    else -> throw AssemblyError("weird type")
-                }
-            }
             else -> throw AssemblyError("invalid prefix operator ${expr.operator}")
         }
     }
@@ -784,9 +829,6 @@ internal class ExpressionsAsmGen(private val program: Program,
             "&" -> asmgen.out("  jsr  prog8_lib.bitand_b")
             "^" -> asmgen.out("  jsr  prog8_lib.bitxor_b")
             "|" -> asmgen.out("  jsr  prog8_lib.bitor_b")
-            "and" -> asmgen.out("  jsr  prog8_lib.and_b")
-            "or" -> asmgen.out("  jsr  prog8_lib.or_b")
-            "xor" -> asmgen.out("  jsr  prog8_lib.xor_b")
             else -> throw AssemblyError("invalid operator $operator")
         }
     }
@@ -818,9 +860,6 @@ internal class ExpressionsAsmGen(private val program: Program,
             "&" -> asmgen.out("  jsr  prog8_lib.bitand_w")
             "^" -> asmgen.out("  jsr  prog8_lib.bitxor_w")
             "|" -> asmgen.out("  jsr  prog8_lib.bitor_w")
-            "and" -> asmgen.out("  jsr  prog8_lib.and_w")
-            "or" -> asmgen.out("  jsr  prog8_lib.or_w")
-            "xor" -> asmgen.out("  jsr  prog8_lib.xor_w")
             else -> throw AssemblyError("invalid operator $operator")
         }
     }
@@ -837,7 +876,7 @@ internal class ExpressionsAsmGen(private val program: Program,
             ">=" -> asmgen.out("  jsr  floats.greatereq_f")
             "==" -> asmgen.out("  jsr  floats.equal_f")
             "!=" -> asmgen.out("  jsr  floats.notequal_f")
-            "%", "<<", ">>", "&", "^", "|", "and", "or", "xor" -> throw AssemblyError("requires integer datatype")
+            "%", "<<", ">>", "&", "^", "|" -> throw AssemblyError("requires integer datatype")
             else -> throw AssemblyError("invalid operator $operator")
         }
     }

codeGenCpu6502/src/prog8/codegen/cpu6502/ForLoopsAsmGen.kt

@@ -31,10 +31,10 @@ internal class ForLoopsAsmGen(private val program: Program, private val asmgen:
     }
 
     private fun translateForOverNonconstRange(stmt: ForLoop, iterableDt: DataType, range: RangeExpression) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
-        val modifiedLabel = asmgen.makeLabel("for_modified")
+        val modifiedLabel = program.makeLabel("for_modified")
-        val modifiedLabel2 = asmgen.makeLabel("for_modifiedb")
+        val modifiedLabel2 = program.makeLabel("for_modifiedb")
         asmgen.loopEndLabels.push(endLabel)
         val stepsize=range.step.constValue(program)!!.number.toInt()
 
@@ -238,8 +238,8 @@ $endLabel""")
     }
 
     private fun translateForOverIterableVar(stmt: ForLoop, iterableDt: DataType, ident: IdentifierReference) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         val iterableName = asmgen.asmVariableName(ident)
         val decl = ident.targetVarDecl(program)!!
@@ -263,7 +263,7 @@ $endLabel""")
             }
             DataType.ARRAY_UB, DataType.ARRAY_B -> {
                 val length = decl.arraysize!!.constIndex()!!
-                val indexVar = asmgen.makeLabel("for_index")
+                val indexVar = program.makeLabel("for_index")
                 asmgen.out("""
                     ldy  #0
 $loopLabel          sty  $indexVar
@@ -299,7 +299,7 @@ $loopLabel          sty  $indexVar
             }
             DataType.ARRAY_W, DataType.ARRAY_UW -> {
                 val length = decl.arraysize!!.constIndex()!! * 2
-                val indexVar = asmgen.makeLabel("for_index")
+                val indexVar = program.makeLabel("for_index")
                 val loopvarName = asmgen.asmVariableName(stmt.loopVar)
                 asmgen.out("""
                     ldy  #0
@@ -359,8 +359,8 @@ $loopLabel          sty  $indexVar
         }
 
         // not one of the easy cases, generate more complex code...
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         when(iterableDt) {
             DataType.ARRAY_B, DataType.ARRAY_UB -> {
@@ -471,8 +471,8 @@ $loopLabel""")
     }
 
     private fun translateForSimpleByteRangeAsc(stmt: ForLoop, range: IntProgression) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         val varname = asmgen.asmVariableName(stmt.loopVar)
         asmgen.out("""
@@ -497,8 +497,8 @@ $endLabel""")
     }
 
     private fun translateForSimpleByteRangeDesc(stmt: ForLoop, range: IntProgression) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         val varname = asmgen.asmVariableName(stmt.loopVar)
         asmgen.out("""
@@ -534,8 +534,8 @@ $endLabel""")
     }
 
     private fun translateForSimpleWordRangeAsc(stmt: ForLoop, range: IntProgression) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         val varname = asmgen.asmVariableName(stmt.loopVar)
         asmgen.out("""
@@ -561,8 +561,8 @@ $loopLabel""")
     }
 
     private fun translateForSimpleWordRangeDesc(stmt: ForLoop, range: IntProgression) {
-        val loopLabel = asmgen.makeLabel("for_loop")
+        val loopLabel = program.makeLabel("for_loop")
-        val endLabel = asmgen.makeLabel("for_end")
+        val endLabel = program.makeLabel("for_end")
         asmgen.loopEndLabels.push(endLabel)
         val varname = asmgen.asmVariableName(stmt.loopVar)
         asmgen.out("""

codeGenCpu6502/src/prog8/codegen/cpu6502/FunctionCallAsmGen.kt

@@ -3,8 +3,14 @@ package prog8.codegen.cpu6502
 import prog8.ast.IFunctionCall
 import prog8.ast.Node
 import prog8.ast.Program
-import prog8.ast.expressions.*
+import prog8.ast.expressions.AddressOf
-import prog8.ast.statements.*
+import prog8.ast.expressions.Expression
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.NumericLiteral
+import prog8.ast.statements.FunctionCallStatement
+import prog8.ast.statements.InlineAssembly
+import prog8.ast.statements.Subroutine
+import prog8.ast.statements.SubroutineParameter
 import prog8.code.core.*
 import prog8.codegen.cpu6502.assignment.AsmAssignSource
 import prog8.codegen.cpu6502.assignment.AsmAssignTarget
@@ -32,17 +38,6 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         }
     }
 
-    internal fun saveXbeforeCall(gosub: GoSub) {
-        val sub = gosub.identifier.targetSubroutine(program)
-        if(sub?.shouldSaveX()==true) {
-            val regSaveOnStack = sub.asmAddress==null       // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
-            if(regSaveOnStack)
-                asmgen.saveRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnEntry)
-            else
-                asmgen.saveRegisterLocal(CpuRegister.X, gosub.definingSubroutine!!)
-        }
-    }
-
     internal fun restoreXafterCall(stmt: IFunctionCall) {
         val sub = stmt.target.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${stmt.target}")
         if(sub.shouldSaveX()) {
@@ -54,17 +49,6 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         }
     }
 
-    internal fun restoreXafterCall(gosub: GoSub) {
-        val sub = gosub.identifier.targetSubroutine(program)
-        if(sub?.shouldSaveX()==true) {
-            val regSaveOnStack = sub.asmAddress==null       // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
-            if(regSaveOnStack)
-                asmgen.restoreRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnReturn)
-            else
-                asmgen.restoreRegisterLocal(CpuRegister.X)
-        }
-    }
-
     internal fun optimizeIntArgsViaRegisters(sub: Subroutine) =
         (sub.parameters.size==1 && sub.parameters[0].type in IntegerDatatypes)
                 || (sub.parameters.size==2 && sub.parameters[0].type in ByteDatatypes && sub.parameters[1].type in ByteDatatypes)
@@ -78,11 +62,6 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         val sub = call.target.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${call.target}")
         val subAsmName = asmgen.asmSymbolName(call.target)
 
-        if(!isExpression && !sub.isAsmSubroutine) {
-            if(!optimizeIntArgsViaRegisters(sub))
-                throw AssemblyError("functioncall statements to non-asmsub should have been replaced by GoSub $call")
-        }
-
         if(sub.isAsmSubroutine) {
             argumentsViaRegisters(sub, call)
             if (sub.inline && asmgen.options.optimize) {
@@ -156,7 +135,7 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
         }
         argOrder.forEach {
             val param = callee.parameters[it]
-            val targetVar = callee.searchAsmParameter(param.name)!!
+            val targetVar = callee.searchParameter(param.name)!!
             asmgen.popCpuStack(param.type, targetVar, (call as Node).definingSubroutine)
         }
     }
@@ -231,10 +210,10 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
             } else {
                 val target: AsmAssignTarget =
                     if(parameter.value.type in ByteDatatypes && (register==RegisterOrPair.AX || register == RegisterOrPair.AY || register==RegisterOrPair.XY || register in Cx16VirtualRegisters))
-                        AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, parameter.value.type, sub, register = register)
+                        AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, parameter.value.type, sub, register = register)
                     else {
                         val signed = parameter.value.type == DataType.BYTE || parameter.value.type == DataType.WORD
-                        AsmAssignTarget.fromRegisters(register, signed, sub, program, asmgen)
+                        AsmAssignTarget.fromRegisters(register, signed, sub, asmgen)
                     }
                 val src = if(valueDt in PassByReferenceDatatypes) {
                     if(value is IdentifierReference) {

codeGenCpu6502/src/prog8/codegen/cpu6502/ProgramAndVarsGen.kt

@@ -44,6 +44,15 @@ internal class ProgramAndVarsGen(
 
         if(errors.noErrors())  {
             program.allBlocks.forEach { block2asm(it) }
+
+            // the global list of all floating point constants for the whole program
+            asmgen.out("; global float constants")
+            for (flt in allocator.globalFloatConsts) {
+                val floatFill = compTarget.machine.getFloatAsmBytes(flt.key)
+                val floatvalue = flt.key
+                asmgen.out("${flt.value}\t.byte  $floatFill  ; float $floatvalue")
+            }
+
             memorySlabs()
             footer()
         }
@@ -70,8 +79,17 @@ internal class ProgramAndVarsGen(
         asmgen.out("P8ZP_SCRATCH_REG = ${zp.SCRATCH_REG}")
         asmgen.out("P8ZP_SCRATCH_W1 = ${zp.SCRATCH_W1}    ; word")
         asmgen.out("P8ZP_SCRATCH_W2 = ${zp.SCRATCH_W2}    ; word")
+        asmgen.out(".weak")   // hack to allow user to override the following two with command line redefinition (however, just use '-esa' command line option instead!)
         asmgen.out("P8ESTACK_LO = ${compTarget.machine.ESTACK_LO.toHex()}")
         asmgen.out("P8ESTACK_HI = ${compTarget.machine.ESTACK_HI.toHex()}")
+        asmgen.out(".endweak")
+
+        if(options.symbolDefs.isNotEmpty()) {
+            asmgen.out("; -- user supplied symbols on the command line")
+            for((name, value) in options.symbolDefs) {
+                asmgen.out("$name = $value")
+            }
+        }
 
         when(options.output) {
             OutputType.RAW -> {
@@ -127,11 +145,8 @@ internal class ProgramAndVarsGen(
             "cx16" -> {
                 if(options.floats)
                     asmgen.out("  lda  #4 |  sta  $01")    // to use floats, make sure Basic rom is banked in
-                asmgen.out("  jsr  main.start |  lda  #4 |  sta  $01")
+                asmgen.out("  jsr  main.start")
-                if(!options.noSysInit)
                 asmgen.out("  jmp  ${compTarget.name}.cleanup_at_exit")
-                else
-                    asmgen.out("  rts")
             }
             "c64" -> {
                 asmgen.out("  jsr  main.start |  lda  #31 |  sta  $01")
@@ -155,23 +170,15 @@ internal class ProgramAndVarsGen(
     private fun memorySlabs() {
         asmgen.out("; memory slabs")
         asmgen.out("prog8_slabs\t.block")
-        for((name, info) in allocator.memorySlabs) {
+        for(slab in symboltable.allMemorySlabs) {
-            if(info.second>1u)
+            if(slab.align>1u)
-                asmgen.out("\t.align  ${info.second.toHex()}")
+                asmgen.out("\t.align  ${slab.align.toHex()}")
-            asmgen.out("$name\t.fill  ${info.first}")
+            asmgen.out("${slab.name}\t.fill  ${slab.size}")
         }
         asmgen.out("\t.bend")
     }
 
     private fun footer() {
-        // the global list of all floating point constants for the whole program
-        asmgen.out("; global float constants")
-        for (flt in allocator.globalFloatConsts) {
-            val floatFill = compTarget.machine.getFloat(flt.key).makeFloatFillAsm()
-            val floatvalue = flt.key
-            asmgen.out("${flt.value}\t.byte  $floatFill  ; float $floatvalue")
-        }
-
         // program end
         asmgen.out("prog8_program_end\t; end of program label for progend()")
     }
@@ -209,9 +216,9 @@ internal class ProgramAndVarsGen(
         if(!options.dontReinitGlobals) {
             // generate subroutine to initialize block-level (global) variables
             if (initializers.isNotEmpty()) {
-                asmgen.out("prog8_init_vars\t.proc\n")
+                asmgen.out("prog8_init_vars\t.block\n")
                 initializers.forEach { assign -> asmgen.translate(assign) }
-                asmgen.out("  rts\n  .pend")
+                asmgen.out("  rts\n  .bend")
             }
         }
 
@@ -263,17 +270,27 @@ internal class ProgramAndVarsGen(
 
         asmgen.out("")
 
+        val asmStartScope: String
+        val asmEndScope: String
+        if(sub.definingBlock.options().contains("force_output")) {
+            asmStartScope = ".block"
+            asmEndScope = ".bend"
+        } else {
+            asmStartScope = ".proc"
+            asmEndScope = ".pend"
+        }
+
         if(sub.isAsmSubroutine) {
             if(sub.asmAddress!=null)
                 return  // already done at the memvars section
 
             // asmsub with most likely just an inline asm in it
-            asmgen.out("${sub.name}\t.proc")
+            asmgen.out("${sub.name}\t$asmStartScope")
             sub.statements.forEach { asmgen.translate(it) }
-            asmgen.out("  .pend\n")
+            asmgen.out("  $asmEndScope\n")
         } else {
             // regular subroutine
-            asmgen.out("${sub.name}\t.proc")
+            asmgen.out("${sub.name}\t$asmStartScope")
 
             val scope = symboltable.lookupOrElse(sub.scopedName) { throw AssemblyError("lookup") }
             require(scope.type==StNodeType.SUBROUTINE)
@@ -302,7 +319,7 @@ internal class ProgramAndVarsGen(
                 asmgen.out("; simple int arg(s) passed via register(s)")
                 if(sub.parameters.size==1) {
                     val dt = sub.parameters[0].type
-                    val target = AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, dt, sub, variableAsmName = sub.parameters[0].name)
+                    val target = AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, dt, sub, variableAsmName = sub.parameters[0].name)
                     if(dt in ByteDatatypes)
                         asmgen.assignRegister(RegisterOrPair.A, target)
                     else
@@ -310,8 +327,8 @@ internal class ProgramAndVarsGen(
                 } else {
                     require(sub.parameters.size==2)
                     // 2 simple byte args, first in A, second in Y
-                    val target1 = AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, sub.parameters[0].type, sub, variableAsmName = sub.parameters[0].name)
+                    val target1 = AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, sub.parameters[0].type, sub, variableAsmName = sub.parameters[0].name)
-                    val target2 = AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, sub.parameters[1].type, sub, variableAsmName = sub.parameters[1].name)
+                    val target2 = AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, sub.parameters[1].type, sub, variableAsmName = sub.parameters[1].name)
                     asmgen.assignRegister(RegisterOrPair.A, target1)
                     asmgen.assignRegister(RegisterOrPair.Y, target2)
                 }
@@ -350,7 +367,7 @@ internal class ProgramAndVarsGen(
                 .map { it.value as StStaticVariable }
             nonZpVariables2asm(variables)
 
-            asmgen.out("  .pend\n")
+            asmgen.out("  $asmEndScope\n")
         }
     }
 
@@ -432,9 +449,9 @@ internal class ProgramAndVarsGen(
         val result = mutableListOf<ZpStringWithInitial>()
         val vars = allocator.zeropageVars.filter { it.value.dt==DataType.STR }
         for (variable in vars) {
-            val svar = symboltable.lookup(variable.key) as StStaticVariable        // TODO faster in flat lookup table
+            val svar = symboltable.flat.getValue(variable.key) as StStaticVariable
-            if(svar.initialStringValue!=null)
+            if(svar.onetimeInitializationStringValue!=null)
-                result.add(ZpStringWithInitial(variable.key, variable.value, svar.initialStringValue!!))
+                result.add(ZpStringWithInitial(variable.key, variable.value, svar.onetimeInitializationStringValue!!))
         }
         return result
     }
@@ -443,9 +460,9 @@ internal class ProgramAndVarsGen(
         val result = mutableListOf<ZpArrayWithInitial>()
         val vars = allocator.zeropageVars.filter { it.value.dt in ArrayDatatypes }
         for (variable in vars) {
-            val svar = symboltable.lookup(variable.key) as StStaticVariable        // TODO faster in flat lookup table
+            val svar = symboltable.flat.getValue(variable.key) as StStaticVariable
-            if(svar.initialArrayValue!=null)
+            if(svar.onetimeInitializationArrayValue!=null)
-                result.add(ZpArrayWithInitial(variable.key, variable.value, svar.initialArrayValue!!))
+                result.add(ZpArrayWithInitial(variable.key, variable.value, svar.onetimeInitializationArrayValue!!))
         }
         return result
     }
@@ -464,7 +481,7 @@ internal class ProgramAndVarsGen(
         asmgen.out("; non-zeropage variables")
         val (stringvars, othervars) = variables.partition { it.dt==DataType.STR }
         stringvars.forEach {
-            outputStringvar(it.name, it.initialStringValue!!.second, it.initialStringValue!!.first)
+            outputStringvar(it.name, it.onetimeInitializationStringValue!!.second, it.onetimeInitializationStringValue!!.first)
         }
         othervars.sortedBy { it.type }.forEach {
             staticVariable2asm(it)
@@ -474,11 +491,11 @@ internal class ProgramAndVarsGen(
     private fun staticVariable2asm(variable: StStaticVariable) {
         val name = variable.name
         val initialValue: Number =
-            if(variable.initialNumericValue!=null) {
+            if(variable.onetimeInitializationNumericValue!=null) {
                 if(variable.dt== DataType.FLOAT)
-                    variable.initialNumericValue!!
+                    variable.onetimeInitializationNumericValue!!
                 else
-                    variable.initialNumericValue!!.toInt()
+                    variable.onetimeInitializationNumericValue!!.toInt()
             } else 0
 
         when (variable.dt) {
@@ -490,14 +507,14 @@ internal class ProgramAndVarsGen(
                 if(initialValue==0) {
                     asmgen.out("$name\t.byte  0,0,0,0,0  ; float")
                 } else {
-                    val floatFill = compTarget.machine.getFloat(initialValue).makeFloatFillAsm()
+                    val floatFill = compTarget.machine.getFloatAsmBytes(initialValue)
                     asmgen.out("$name\t.byte  $floatFill  ; float $initialValue")
                 }
             }
             DataType.STR -> {
                 throw AssemblyError("all string vars should have been interned into prog")
             }
-            in ArrayDatatypes -> arrayVariable2asm(name, variable.dt, variable.initialArrayValue, variable.length)
+            in ArrayDatatypes -> arrayVariable2asm(name, variable.dt, variable.onetimeInitializationArrayValue, variable.length)
             else -> {
                 throw AssemblyError("weird dt")
             }
@@ -549,7 +566,7 @@ internal class ProgramAndVarsGen(
             DataType.ARRAY_F -> {
                 val array = value ?: zeroFilledArray(orNumberOfZeros!!)
                 val floatFills = array.map {
-                    compTarget.machine.getFloat(it.number!!).makeFloatFillAsm()
+                    compTarget.machine.getFloatAsmBytes(it.number!!)
                 }
                 asmgen.out(varname)
                 for (f in array.zip(floatFills))

codeGenCpu6502/src/prog8/codegen/cpu6502/VariableAllocator.kt

@@ -15,8 +15,6 @@ internal class VariableAllocator(private val symboltable: SymbolTable,
 ) {
 
     private val zeropage = options.compTarget.machine.zeropage
-    private val memorySlabsInternal = mutableMapOf<String, Pair<UInt, UInt>>()
-    internal val memorySlabs: Map<String, Pair<UInt, UInt>> = memorySlabsInternal
     internal val globalFloatConsts = mutableMapOf<Double, String>()     // all float values in the entire program (value -> varname)
     internal val zeropageVars: Map<List<String>, Zeropage.ZpAllocation> = zeropage.allocatedVariables
 
@@ -24,12 +22,6 @@ internal class VariableAllocator(private val symboltable: SymbolTable,
         allocateZeropageVariables()
     }
 
-    internal fun getMemorySlab(name: String) = memorySlabsInternal[name]
-
-    internal fun allocateMemorySlab(name: String, size: UInt, align: UInt) {
-        memorySlabsInternal[name] = Pair(size, align)
-    }
-
     internal fun isZpVar(scopedName: List<String>) = scopedName in zeropage.allocatedVariables
 
     internal fun getFloatAsmConst(number: Double): String {

codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AsmAssignment.kt

@@ -29,7 +29,6 @@ internal enum class SourceStorageKind {
 }
 
 internal class AsmAssignTarget(val kind: TargetStorageKind,
-                               private val program: Program,
                                private val asmgen: AsmGen,
                                val datatype: DataType,
                                val scope: Subroutine?,
@@ -70,28 +69,28 @@ internal class AsmAssignTarget(val kind: TargetStorageKind,
                                 if(reg.statusflag!=null)
                                     throw AssemblyError("can't assign value to processor statusflag directly")
                                 else
-                                    return AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, dt, assign.definingSubroutine, register=reg.registerOrPair, origAstTarget = this)
+                                    return AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, dt, assign.definingSubroutine, register=reg.registerOrPair, origAstTarget = this)
                             }
                         }
-                        return AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, dt, assign.definingSubroutine, variableAsmName = asmgen.asmVariableName(identifier!!), origAstTarget =  this)
+                        return AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, dt, assign.definingSubroutine, variableAsmName = asmgen.asmVariableName(identifier!!), origAstTarget =  this)
                     }
-                    arrayindexed != null -> return AsmAssignTarget(TargetStorageKind.ARRAY, program, asmgen, dt, assign.definingSubroutine, array = arrayindexed, origAstTarget =  this)
+                    arrayindexed != null -> return AsmAssignTarget(TargetStorageKind.ARRAY, asmgen, dt, assign.definingSubroutine, array = arrayindexed, origAstTarget =  this)
-                    memoryAddress != null -> return AsmAssignTarget(TargetStorageKind.MEMORY, program, asmgen, dt, assign.definingSubroutine, memory =  memoryAddress, origAstTarget =  this)
+                    memoryAddress != null -> return AsmAssignTarget(TargetStorageKind.MEMORY, asmgen, dt, assign.definingSubroutine, memory =  memoryAddress, origAstTarget =  this)
                     else -> throw AssemblyError("weird target")
                 }
             }
         }
 
-        fun fromRegisters(registers: RegisterOrPair, signed: Boolean, scope: Subroutine?, program: Program, asmgen: AsmGen): AsmAssignTarget =
+        fun fromRegisters(registers: RegisterOrPair, signed: Boolean, scope: Subroutine?, asmgen: AsmGen): AsmAssignTarget =
                 when(registers) {
                     RegisterOrPair.A,
                     RegisterOrPair.X,
-                    RegisterOrPair.Y -> AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, if(signed) DataType.BYTE else DataType.UBYTE, scope, register = registers)
+                    RegisterOrPair.Y -> AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, if(signed) DataType.BYTE else DataType.UBYTE, scope, register = registers)
                     RegisterOrPair.AX,
                     RegisterOrPair.AY,
-                    RegisterOrPair.XY -> AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, if(signed) DataType.WORD else DataType.UWORD, scope, register = registers)
+                    RegisterOrPair.XY -> AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, if(signed) DataType.WORD else DataType.UWORD, scope, register = registers)
                     RegisterOrPair.FAC1,
-                    RegisterOrPair.FAC2 -> AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, DataType.FLOAT, scope, register = registers)
+                    RegisterOrPair.FAC2 -> AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, DataType.FLOAT, scope, register = registers)
                     RegisterOrPair.R0,
                     RegisterOrPair.R1,
                     RegisterOrPair.R2,
@@ -107,7 +106,7 @@ internal class AsmAssignTarget(val kind: TargetStorageKind,
                     RegisterOrPair.R12,
                     RegisterOrPair.R13,
                     RegisterOrPair.R14,
-                    RegisterOrPair.R15 -> AsmAssignTarget(TargetStorageKind.REGISTER, program, asmgen, if(signed) DataType.WORD else DataType.UWORD, scope, register = registers)
+                    RegisterOrPair.R15 -> AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, if(signed) DataType.WORD else DataType.UWORD, scope, register = registers)
                 }
     }
 }

codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt

@@ -2,7 +2,6 @@ package prog8.codegen.cpu6502.assignment
 
 import prog8.ast.Program
 import prog8.ast.expressions.*
-import prog8.ast.getTempRegisterName
 import prog8.ast.statements.*
 import prog8.code.core.*
 import prog8.codegen.cpu6502.AsmGen
@@ -30,7 +29,7 @@ internal class AssignmentAsmGen(private val program: Program,
 
     internal fun virtualRegsToVariables(origtarget: AsmAssignTarget): AsmAssignTarget {
         return if(origtarget.kind==TargetStorageKind.REGISTER && origtarget.register in Cx16VirtualRegisters) {
-            AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, origtarget.datatype, origtarget.scope,
+            AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, origtarget.datatype, origtarget.scope,
                 variableAsmName = "cx16.${origtarget.register!!.name.lowercase()}", origAstTarget = origtarget.origAstTarget)
         } else origtarget
     }
@@ -221,9 +220,25 @@ internal class AssignmentAsmGen(private val program: Program,
                             RegisterOrPair.A -> assignRegisterByte(assign.target, CpuRegister.A)
                             RegisterOrPair.X -> assignRegisterByte(assign.target, CpuRegister.X)
                             RegisterOrPair.Y -> assignRegisterByte(assign.target, CpuRegister.Y)
-                            RegisterOrPair.AX -> assignRegisterpairWord(assign.target, RegisterOrPair.AX)
+                            RegisterOrPair.AX -> assignVirtualRegister(assign.target, RegisterOrPair.AX)
-                            RegisterOrPair.AY -> assignRegisterpairWord(assign.target, RegisterOrPair.AY)
+                            RegisterOrPair.AY -> assignVirtualRegister(assign.target, RegisterOrPair.AY)
-                            RegisterOrPair.XY -> assignRegisterpairWord(assign.target, RegisterOrPair.XY)
+                            RegisterOrPair.XY -> assignVirtualRegister(assign.target, RegisterOrPair.XY)
+                            RegisterOrPair.R0 -> assignVirtualRegister(assign.target, RegisterOrPair.R0)
+                            RegisterOrPair.R1 -> assignVirtualRegister(assign.target, RegisterOrPair.R1)
+                            RegisterOrPair.R2 -> assignVirtualRegister(assign.target, RegisterOrPair.R2)
+                            RegisterOrPair.R3 -> assignVirtualRegister(assign.target, RegisterOrPair.R3)
+                            RegisterOrPair.R4 -> assignVirtualRegister(assign.target, RegisterOrPair.R4)
+                            RegisterOrPair.R5 -> assignVirtualRegister(assign.target, RegisterOrPair.R5)
+                            RegisterOrPair.R6 -> assignVirtualRegister(assign.target, RegisterOrPair.R6)
+                            RegisterOrPair.R7 -> assignVirtualRegister(assign.target, RegisterOrPair.R7)
+                            RegisterOrPair.R8 -> assignVirtualRegister(assign.target, RegisterOrPair.R8)
+                            RegisterOrPair.R9 -> assignVirtualRegister(assign.target, RegisterOrPair.R9)
+                            RegisterOrPair.R10 -> assignVirtualRegister(assign.target, RegisterOrPair.R10)
+                            RegisterOrPair.R11 -> assignVirtualRegister(assign.target, RegisterOrPair.R11)
+                            RegisterOrPair.R12 -> assignVirtualRegister(assign.target, RegisterOrPair.R12)
+                            RegisterOrPair.R13 -> assignVirtualRegister(assign.target, RegisterOrPair.R13)
+                            RegisterOrPair.R14 -> assignVirtualRegister(assign.target, RegisterOrPair.R14)
+                            RegisterOrPair.R15 -> assignVirtualRegister(assign.target, RegisterOrPair.R15)
                             else -> {
                                 val sflag = returnValue.second.statusflag
                                 if(sflag!=null)
@@ -283,7 +298,6 @@ internal class AssignmentAsmGen(private val program: Program,
                     "+" -> {}
                     "-" -> augmentableAsmGen.inplaceNegate(target, target.datatype)
                     "~" -> augmentableAsmGen.inplaceInvert(target, target.datatype)
-                    "not" -> augmentableAsmGen.inplaceBooleanNot(target, target.datatype)
                     else -> throw AssemblyError("invalid prefix operator")
                 }
             }
@@ -303,11 +317,32 @@ internal class AssignmentAsmGen(private val program: Program,
         }
     }
 
+    private fun assignVirtualRegister(target: AsmAssignTarget, register: RegisterOrPair) {
+        when(target.datatype) {
+            in ByteDatatypes -> {
+                asmgen.out("  lda  cx16.${register.toString().lowercase()}L")
+                assignRegisterByte(target, CpuRegister.A)
+            }
+            in WordDatatypes -> assignRegisterpairWord(target, register)
+            else -> throw AssemblyError("expected byte or word")
+        }
+    }
+
     private fun attemptAssignOptimizedBinexpr(expr: BinaryExpression, assign: AsmAssignment): Boolean {
         if(expr.operator in ComparisonOperators) {
-            assignConstantByte(assign.target, 0)
+            if(expr.right.constValue(program)?.number == 0.0) {
+                if(expr.operator == "==" || expr.operator=="!=") {
+                    when(assign.target.datatype) {
+                        in ByteDatatypes -> if(attemptAssignToByteCompareZero(expr, assign)) return true
+                        else -> {
+                            // do nothing, this is handled by a type cast.
+                        }
+                    }
+                }
+            }
             val origTarget = assign.target.origAstTarget
             if(origTarget!=null) {
+                assignConstantByte(assign.target, 0)
                 val assignTrue = AnonymousScope(mutableListOf(
                     Assignment(origTarget, NumericLiteral.fromBoolean(true, assign.position), AssignmentOrigin.ASMGEN, assign.position)
                 ), assign.position)
@@ -322,66 +357,114 @@ internal class AssignmentAsmGen(private val program: Program,
         if(!expr.inferType(program).isInteger)
             return false
 
-        // optimized code for logical expressions
+        if(expr.operator in setOf("&", "|", "^", "and", "or", "xor")) {
-        // TODO assume (hope) cx16.r9 isn't used for anything else during the use of this...
+            if(expr.left.inferType(program).isBytes && expr.right.inferType(program).isBytes &&
-        if(expr.operator=="and") {
+                    expr.left.isSimple && expr.right.isSimple) {
-            val iDt = expr.left.inferType(program)
+                if(expr.right is NumericLiteral || expr.right is IdentifierReference)
-            val dt = iDt.getOrElse { throw AssemblyError("weird dt") }
+                    assignLogicalWithSimpleRightOperandByte(assign.target, expr.left, expr.operator, expr.right)
-            if (dt in ByteDatatypes) {
+                else if(expr.left is NumericLiteral || expr.left is IdentifierReference)
-                val tmpReg = getTempRegisterName(iDt).joinToString(".")
+                    assignLogicalWithSimpleRightOperandByte(assign.target, expr.right, expr.operator, expr.left)
-                assignExpressionToVariable(expr.left, tmpReg, dt, expr.definingSubroutine)
-                assignExpressionToRegister(expr.right, RegisterOrPair.A, dt==DataType.BYTE || dt==DataType.WORD)
-                asmgen.out("  and  $tmpReg")
-                if(assign.target.datatype in ByteDatatypes)
-                    assignRegisterByte(assign.target, CpuRegister.A)
                 else {
-                    asmgen.out("  ldy  #0")
+                    assignExpressionToRegister(expr.left, RegisterOrPair.A, false)
+                    asmgen.saveRegisterStack(CpuRegister.A, false)
+                    assignExpressionToVariable(expr.right, "P8ZP_SCRATCH_B1", DataType.UBYTE, expr.definingSubroutine)
+                    asmgen.restoreRegisterStack(CpuRegister.A, false)
+                    when (expr.operator) {
+                        "&", "and" -> asmgen.out("  and  P8ZP_SCRATCH_B1")
+                        "|", "or" -> asmgen.out("  ora  P8ZP_SCRATCH_B1")
+                        "^", "xor" -> asmgen.out("  eor  P8ZP_SCRATCH_B1")
+                        else -> throw AssemblyError("invalid operator")
+                    }
+                    assignRegisterByte(assign.target, CpuRegister.A)
+                }
+                return true
+            }
+            if(expr.left.inferType(program).isWords && expr.right.inferType(program).isWords &&
+                    expr.left.isSimple && expr.right.isSimple) {
+                if(expr.right is NumericLiteral || expr.right is IdentifierReference)
+                    assignLogicalWithSimpleRightOperandWord(assign.target, expr.left, expr.operator, expr.right)
+                else if(expr.left is NumericLiteral || expr.left is IdentifierReference)
+                    assignLogicalWithSimpleRightOperandWord(assign.target, expr.right, expr.operator, expr.left)
+                else {
+                    assignExpressionToRegister(expr.left, RegisterOrPair.AY, false)
+                    asmgen.saveRegisterStack(CpuRegister.A, false)
+                    asmgen.saveRegisterStack(CpuRegister.Y, false)
+                    assignExpressionToVariable(expr.right, "P8ZP_SCRATCH_W1", DataType.UWORD, expr.definingSubroutine)
+                    when (expr.operator) {
+                        "&", "and" -> asmgen.out("  pla |  and  P8ZP_SCRATCH_W1+1 |  tay |  pla |  and  P8ZP_SCRATCH_W1")
+                        "|", "or" -> asmgen.out("  pla |  ora  P8ZP_SCRATCH_W1+1 |  tay |  pla |  ora  P8ZP_SCRATCH_W1")
+                        "^", "xor" -> asmgen.out("  pla |  eor  P8ZP_SCRATCH_W1+1 |  tay |  pla |  eor  P8ZP_SCRATCH_W1")
+                        else -> throw AssemblyError("invalid operator")
+                    }
                     assignRegisterpairWord(assign.target, RegisterOrPair.AY)
                 }
                 return true
             }
-            else throw AssemblyError("weird dt for and, expected byte $expr @${expr.position}")
-        }
-        else if(expr.operator=="or") {
-            val iDt = expr.left.inferType(program)
-            val dt = iDt.getOrElse { throw AssemblyError("weird dt") }
-            if (dt in ByteDatatypes) {
-                val tmpReg = getTempRegisterName(iDt).joinToString(".")
-                assignExpressionToVariable(expr.left, tmpReg, dt, expr.definingSubroutine)
-                assignExpressionToRegister(expr.right, RegisterOrPair.A, dt==DataType.BYTE || dt==DataType.WORD)
-                asmgen.out("  ora  $tmpReg")
-                if(assign.target.datatype in ByteDatatypes)
-                    assignRegisterByte(assign.target, CpuRegister.A)
-                else {
-                    asmgen.out("  ldy  #0")
-                    assignRegisterpairWord(assign.target, RegisterOrPair.AY)
-                }
-                return true
-            }
-            else throw AssemblyError("weird dt for or, expected byte $expr @${expr.position}")
-        }
-        else if(expr.operator=="xor") {
-            val iDt = expr.left.inferType(program)
-            val dt = iDt.getOrElse { throw AssemblyError("weird dt") }
-            if (dt in ByteDatatypes) {
-                val tmpReg = getTempRegisterName(iDt).joinToString(".")
-                assignExpressionToVariable(expr.left, tmpReg, dt, expr.definingSubroutine)
-                assignExpressionToRegister(expr.right, RegisterOrPair.A, dt==DataType.BYTE || dt==DataType.WORD)
-                asmgen.out("  eor  $tmpReg")
-                if(assign.target.datatype in ByteDatatypes)
-                    assignRegisterByte(assign.target, CpuRegister.A)
-                else {
-                    asmgen.out("  ldy  #0")
-                    assignRegisterpairWord(assign.target, RegisterOrPair.AY)
-                }
-                return true
-            }
-            else throw AssemblyError("weird dt for xor, expected byte $expr @${expr.position}")
-        }
-
-        if(expr.operator!="+" && expr.operator!="-")
             return false
+        }
 
+        if(expr.operator == "==" || expr.operator == "!=") {
+            // expression datatype is BOOL (ubyte) but operands can be anything
+            if(expr.left.inferType(program).isBytes && expr.right.inferType(program).isBytes &&
+                    expr.left.isSimple && expr.right.isSimple) {
+                assignExpressionToRegister(expr.left, RegisterOrPair.A, false)
+                asmgen.saveRegisterStack(CpuRegister.A, false)
+                assignExpressionToVariable(expr.right, "P8ZP_SCRATCH_B1", DataType.UBYTE, expr.definingSubroutine)
+                asmgen.restoreRegisterStack(CpuRegister.A, false)
+                if(expr.operator=="==") {
+                    asmgen.out("""
+                        cmp  P8ZP_SCRATCH_B1
+                        bne  +
+                        lda  #1
+                        bne  ++
++                       lda  #0
++""")
+                } else {
+                    asmgen.out("""
+                        cmp  P8ZP_SCRATCH_B1
+                        beq  +
+                        lda  #1
+                        bne  ++
++                       lda  #0
++""")
+                }
+                assignRegisterByte(assign.target, CpuRegister.A)
+                return true
+            } else if(expr.left.inferType(program).isWords && expr.right.inferType(program).isWords &&
+                    expr.left.isSimple && expr.right.isSimple) {
+                assignExpressionToRegister(expr.left, RegisterOrPair.AY, false)
+                asmgen.saveRegisterStack(CpuRegister.A, false)
+                asmgen.saveRegisterStack(CpuRegister.Y, false)
+                assignExpressionToVariable(expr.right, "P8ZP_SCRATCH_W1", DataType.UWORD, expr.definingSubroutine)
+                asmgen.restoreRegisterStack(CpuRegister.Y, false)
+                asmgen.restoreRegisterStack(CpuRegister.A, false)
+                if(expr.operator=="==") {
+                    asmgen.out("""
+                        cmp  P8ZP_SCRATCH_W1
+                        bne  +
+                        cpy  P8ZP_SCRATCH_W1+1
+                        bne  +
+                        lda  #1
+                        bne  ++
++                       lda  #0
++""")
+                } else {
+                    asmgen.out("""
+                        cmp  P8ZP_SCRATCH_W1
+                        bne  +
+                        cpy  P8ZP_SCRATCH_W1+1
+                        bne  +
+                        lda  #0
+                        bne  ++
++                       lda  #1
++""")
+                }
+                assignRegisterByte(assign.target, CpuRegister.A)
+                return true
+            }
+            return false
+        }
+        else if(expr.operator=="+" || expr.operator=="-") {
             val dt = expr.inferType(program).getOrElse { throw AssemblyError("invalid dt") }
             val left = expr.left
             val right = expr.right
@@ -510,12 +593,124 @@ internal class AssignmentAsmGen(private val program: Program,
                     else -> return false
                 }
             }
+        }
         return false
     }
 
+    private fun assignLogicalWithSimpleRightOperandByte(target: AsmAssignTarget, left: Expression, operator: String, right: Expression) {
+        assignExpressionToRegister(left, RegisterOrPair.A, false)
+        val operand = when(right) {
+            is NumericLiteral -> "#${right.number.toHex()}"
+            is IdentifierReference -> asmgen.asmSymbolName(right)
+            else -> throw AssemblyError("wrong right operand type")
+        }
+        when (operator) {
+            "&", "and" -> asmgen.out("  and  $operand")
+            "|", "or" -> asmgen.out("  ora  $operand")
+            "^", "xor" -> asmgen.out("  eor  $operand")
+            else -> throw AssemblyError("invalid operator")
+        }
+        assignRegisterByte(target, CpuRegister.A)
+    }
+
+    private fun assignLogicalWithSimpleRightOperandWord(target: AsmAssignTarget, left: Expression, operator: String, right: Expression) {
+        assignExpressionToRegister(left, RegisterOrPair.AY, false)
+        when(right) {
+            is NumericLiteral -> {
+                val number = right.number.toHex()
+                when (operator) {
+                    "&", "and" -> asmgen.out("  and  #<$number |  pha |  tya |  and  #>$number |  tay |  pla")
+                    "|", "or" -> asmgen.out("  ora  #<$number |  pha |  tya |  ora  #>$number |  tay |  pla")
+                    "^", "xor" -> asmgen.out("  eor  #<$number |  pha |  tya |  eor  #>$number |  tay |  pla")
+                    else -> throw AssemblyError("invalid operator")
+                }
+            }
+            is IdentifierReference -> {
+                val name = asmgen.asmSymbolName(right)
+                when (operator) {
+                    "&", "and" -> asmgen.out("  and  $name |  pha |  tya |  and  $name+1 |  tay |  pla")
+                    "|", "or" -> asmgen.out("  ora  $name |  pha |  tya |  ora  $name+1 |  tay |  pla")
+                    "^", "xor" -> asmgen.out("  eor  $name |  pha |  tya |  eor  $name+1 |  tay |  pla")
+                    else -> throw AssemblyError("invalid operator")
+                }
+            }
+            else -> throw AssemblyError("wrong right operand type")
+        }
+        assignRegisterpairWord(target, RegisterOrPair.AY)
+    }
+
+    private fun attemptAssignToByteCompareZero(expr: BinaryExpression, assign: AsmAssignment): Boolean {
+        when (expr.operator) {
+            "==" -> {
+                when(val dt = expr.left.inferType(program).getOrElse { throw AssemblyError("invalid dt") }) {
+                    in ByteDatatypes -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.A, dt==DataType.BYTE)
+                        asmgen.out("""
+                            beq  +
+                            lda  #0
+                            beq  ++
++                           lda  #1
++""")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    in WordDatatypes -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.AY, dt==DataType.WORD)
+                        asmgen.out("""
+                            sty  P8ZP_SCRATCH_B1
+                            ora  P8ZP_SCRATCH_B1
+                            beq  +
+                            lda  #0
+                            beq  ++
++                           lda  #1
++""")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    DataType.FLOAT -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.FAC1, true)
+                        asmgen.out("  jsr  floats.SIGN |  and  #1 |  eor  #1")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    else->{
+                        return false
+                    }
+                }
+            }
+            "!=" -> {
+                when(val dt = expr.left.inferType(program).getOrElse { throw AssemblyError("invalid dt") }) {
+                    in ByteDatatypes -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.A, dt==DataType.BYTE)
+                        asmgen.out("  beq  + |  lda  #1")
+                        asmgen.out("+")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    in WordDatatypes -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.AY, dt==DataType.WORD)
+                        asmgen.out("  sty  P8ZP_SCRATCH_B1 |  ora  P8ZP_SCRATCH_B1")
+                        asmgen.out("  beq  + |  lda  #1")
+                        asmgen.out("+")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    DataType.FLOAT -> {
+                        assignExpressionToRegister(expr.left, RegisterOrPair.FAC1, true)
+                        asmgen.out("  jsr  floats.SIGN")
+                        assignRegisterByte(assign.target, CpuRegister.A)
+                        return true
+                    }
+                    else->{
+                        return false
+                    }
+                }
+            }
+            else -> return false
+        }
+    }
+
     private fun fallbackToStackEval(assign: AsmAssignment) {
-        // TODO DON'T STACK-EVAL... perhaps by using a temp var? so that it becomes augmentable assignment expression?
-        //      or don't try to solve it here in this one case and rather rewrite the whole stack based value evaluation.
         // this routine is called for assigning a binaryexpression value:
         // - if it's a boolean comparison expression and the workaround isn't possible (no origTarget ast node)
         // - for all other binary expressions.
@@ -539,7 +734,7 @@ internal class AssignmentAsmGen(private val program: Program,
                     val varname = asmgen.asmVariableName(containment.iterable as IdentifierReference)
                     assignExpressionToRegister(containment.element, RegisterOrPair.A, elementDt istype DataType.BYTE)
                     asmgen.saveRegisterLocal(CpuRegister.A, containment.definingSubroutine!!)
-                    assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
+                    assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
                     asmgen.restoreRegisterLocal(CpuRegister.A)
                     asmgen.out("  ldy  #${stringVal.value.length}")
                     asmgen.out("  jsr  prog8_lib.containment_bytearray")
@@ -558,14 +753,14 @@ internal class AssignmentAsmGen(private val program: Program,
                         in ByteDatatypes -> {
                             assignExpressionToRegister(containment.element, RegisterOrPair.A, elementDt istype DataType.BYTE)
                             asmgen.saveRegisterLocal(CpuRegister.A, containment.definingSubroutine!!)
-                            assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
+                            assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
                             asmgen.restoreRegisterLocal(CpuRegister.A)
                             asmgen.out("  ldy  #${arrayVal.value.size}")
                             asmgen.out("  jsr  prog8_lib.containment_bytearray")
                         }
                         in WordDatatypes -> {
                             assignExpressionToVariable(containment.element, "P8ZP_SCRATCH_W1", elementDt.getOr(DataType.UNDEFINED), containment.definingSubroutine)
-                            assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W2"), varname)
+                            assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W2"), varname)
                             asmgen.out("  ldy  #${arrayVal.value.size}")
                             asmgen.out("  jsr  prog8_lib.containment_wordarray")
                         }
@@ -582,7 +777,7 @@ internal class AssignmentAsmGen(private val program: Program,
                 // use subroutine
                 assignExpressionToRegister(containment.element, RegisterOrPair.A, elementDt istype DataType.BYTE)
                 asmgen.saveRegisterLocal(CpuRegister.A, containment.definingSubroutine!!)
-                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
+                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
                 asmgen.restoreRegisterLocal(CpuRegister.A)
                 val stringVal = variable.value as StringLiteral
                 asmgen.out("  ldy  #${stringVal.value.length}")
@@ -596,7 +791,7 @@ internal class AssignmentAsmGen(private val program: Program,
                 val arrayVal = variable.value as ArrayLiteral
                 assignExpressionToRegister(containment.element, RegisterOrPair.A, elementDt istype DataType.BYTE)
                 asmgen.saveRegisterLocal(CpuRegister.A, containment.definingSubroutine!!)
-                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
+                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
                 asmgen.restoreRegisterLocal(CpuRegister.A)
                 asmgen.out("  ldy  #${arrayVal.value.size}")
                 asmgen.out("  jsr  prog8_lib.containment_bytearray")
@@ -605,7 +800,7 @@ internal class AssignmentAsmGen(private val program: Program,
             DataType.ARRAY_W, DataType.ARRAY_UW -> {
                 val arrayVal = variable.value as ArrayLiteral
                 assignExpressionToVariable(containment.element, "P8ZP_SCRATCH_W1", elementDt.getOr(DataType.UNDEFINED), containment.definingSubroutine)
-                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W2"), varname)
+                assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W2"), varname)
                 asmgen.out("  ldy  #${arrayVal.value.size}")
                 asmgen.out("  jsr  prog8_lib.containment_wordarray")
                 return
@@ -716,10 +911,10 @@ internal class AssignmentAsmGen(private val program: Program,
             return
         }
 
-        if(origTypeCastExpression.type == DataType.UBYTE) {
+        if(valueDt in WordDatatypes && origTypeCastExpression.type == DataType.UBYTE) {
             val parentTc = origTypeCastExpression.parent as? TypecastExpression
             if(parentTc!=null && parentTc.type==DataType.UWORD) {
-                // typecast something to ubyte and directly back to uword
+                // typecast a word value to ubyte and directly back to uword
                 // generate code for lsb(value) here instead of the ubyte typecast
                 return assignCastViaLsbFunc(value, target)
             }
@@ -769,6 +964,23 @@ internal class AssignmentAsmGen(private val program: Program,
                 assignTypeCastedFloatFAC1("P8ZP_SCRATCH_W1", target.datatype)
                 assignVariableToRegister("P8ZP_SCRATCH_W1", target.register!!, target.datatype in SignedDatatypes)
             } else {
+                if(!(valueDt isAssignableTo targetDt)) {
+                    if(valueDt in WordDatatypes && targetDt in ByteDatatypes) {
+                        // word to byte, just take the lsb
+                        return assignCastViaLsbFunc(value, target)
+                    } else if(valueDt in WordDatatypes && targetDt in WordDatatypes) {
+                        // word to word, just assign
+                        assignExpressionToRegister(value, target.register!!, targetDt==DataType.BYTE || targetDt==DataType.WORD)
+                    } else if(valueDt in ByteDatatypes && targetDt in ByteDatatypes) {
+                        // byte to byte, just assign
+                        assignExpressionToRegister(value, target.register!!, targetDt==DataType.BYTE || targetDt==DataType.WORD)
+                    } else if(valueDt in ByteDatatypes && targetDt in WordDatatypes) {
+                        // byte to word, just assign
+                        assignExpressionToRegister(value, target.register!!, targetDt==DataType.WORD)
+                    }
+                    else
+                        throw AssemblyError("can't cast $valueDt to $targetDt, this should have been checked in the astchecker")
+                }
                 assignExpressionToRegister(value, target.register!!, targetDt==DataType.BYTE || targetDt==DataType.WORD)
             }
             return
@@ -2150,10 +2362,7 @@ internal class AssignmentAsmGen(private val program: Program,
                     RegisterOrPair.XY -> asmgen.out("  ldx  #0 |  ldy  #0")
                     RegisterOrPair.FAC1, RegisterOrPair.FAC2 -> throw AssemblyError("expected typecasted byte to float")
                     in Cx16VirtualRegisters -> {
-                        asmgen.out(
+                        asmgen.out("  stz  cx16.${target.register.toString().lowercase()} |  stz  cx16.${target.register.toString().lowercase()}+1")
-                            "  stz  cx16.${
-                                target.register.toString().lowercase()
-                            } |  stz  cx16.${target.register.toString().lowercase()}+1")
                     }
                     else -> throw AssemblyError("weird register")
                 }
@@ -2546,7 +2755,7 @@ internal class AssignmentAsmGen(private val program: Program,
 
     internal fun assignExpressionToRegister(expr: Expression, register: RegisterOrPair, signed: Boolean) {
         val src = AsmAssignSource.fromAstSource(expr, program, asmgen)
-        val tgt = AsmAssignTarget.fromRegisters(register, signed, null, program, asmgen)
+        val tgt = AsmAssignTarget.fromRegisters(register, signed, null, asmgen)
         val assign = AsmAssignment(src, tgt, false, program.memsizer, expr.position)
         translateNormalAssignment(assign)
     }
@@ -2556,14 +2765,14 @@ internal class AssignmentAsmGen(private val program: Program,
             throw AssemblyError("can't directly assign a FLOAT expression to an integer variable $expr")
         } else {
             val src = AsmAssignSource.fromAstSource(expr, program, asmgen)
-            val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, program, asmgen, dt, scope, variableAsmName = asmVarName)
+            val tgt = AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, dt, scope, variableAsmName = asmVarName)
             val assign = AsmAssignment(src, tgt, false, program.memsizer, expr.position)
             translateNormalAssignment(assign)
         }
     }
 
     internal fun assignVariableToRegister(asmVarName: String, register: RegisterOrPair, signed: Boolean) {
-        val tgt = AsmAssignTarget.fromRegisters(register, signed, null, program, asmgen)
+        val tgt = AsmAssignTarget.fromRegisters(register, signed, null, asmgen)
         val src = AsmAssignSource(SourceStorageKind.VARIABLE, program, asmgen, tgt.datatype, variableAsmName = asmVarName)
         val assign = AsmAssignment(src, tgt, false, program.memsizer, Position.DUMMY)
         translateNormalAssignment(assign)

codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AugmentableAssignmentAsmGen.kt

@@ -28,7 +28,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     "+" -> {}
                     "-" -> inplaceNegate(target, type)
                     "~" -> inplaceInvert(target, type)
-                    "not" -> inplaceBooleanNot(target, type)
                     else -> throw AssemblyError("invalid prefix operator")
                 }
             }
@@ -237,7 +236,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     }
                     else -> {
                         // TODO use some other evaluation here; don't use the estack to transfer the address to read/write from
-                        asmgen.assignExpressionTo(memory.addressExpression, AsmAssignTarget(TargetStorageKind.STACK, program, asmgen, DataType.UWORD, memory.definingSubroutine))
+                        asmgen.assignExpressionTo(memory.addressExpression, AsmAssignTarget(TargetStorageKind.STACK, asmgen, DataType.UWORD, memory.definingSubroutine))
                         asmgen.out("  jsr  prog8_lib.read_byte_from_address_on_stack |  sta  P8ZP_SCRATCH_B1")
                         when {
                             valueLv != null -> inplaceModification_byte_litval_to_variable("P8ZP_SCRATCH_B1", DataType.UBYTE, operator, valueLv.toInt())
@@ -306,7 +305,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                         AsmAssignTarget.fromRegisters(
                                             RegisterOrPair.A,
                                             target.datatype == DataType.BYTE, null,
-                                            program,
                                             asmgen
                                         )
                                     val assign = AsmAssignment(target.origAssign.source, tgt, false, program.memsizer, value.position)
@@ -318,7 +316,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                         AsmAssignTarget.fromRegisters(
                                             RegisterOrPair.AY,
                                             target.datatype == DataType.WORD, null,
-                                            program,
                                             asmgen
                                         )
                                     val assign = AsmAssignment(target.origAssign.source, tgt, false, program.memsizer, value.position)
@@ -330,7 +327,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                         AsmAssignTarget.fromRegisters(
                                             RegisterOrPair.FAC1,
                                             true, null,
-                                            program,
                                             asmgen
                                         )
                                     val assign = AsmAssignment(target.origAssign.source, tgt, false, program.memsizer, value.position)
@@ -391,9 +387,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     bne  -
 +""")
             }
-            "&", "and" -> asmgen.out(" and  P8ZP_SCRATCH_B1")
+            "&" -> asmgen.out(" and  P8ZP_SCRATCH_B1")
-            "|", "or" -> asmgen.out(" ora  P8ZP_SCRATCH_B1")
+            "|" -> asmgen.out(" ora  P8ZP_SCRATCH_B1")
-            "^", "xor" -> asmgen.out(" eor  P8ZP_SCRATCH_B1")
+            "^" -> asmgen.out(" eor  P8ZP_SCRATCH_B1")
             else -> throw AssemblyError("invalid operator for in-place modification $operator")
         }
         asmgen.storeAIntoZpPointerVar(sourceName)
@@ -428,9 +424,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                         bne  -
 +""")
             }
-            "&", "and" -> asmgen.out(" and  $otherName")
+            "&" -> asmgen.out(" and  $otherName")
-            "|", "or" -> asmgen.out(" ora  $otherName")
+            "|" -> asmgen.out(" ora  $otherName")
-            "^", "xor" -> asmgen.out(" eor  $otherName")
+            "^" -> asmgen.out(" eor  $otherName")
             else -> throw AssemblyError("invalid operator for in-place modification $operator")
         }
         asmgen.storeAIntoZpPointerVar(sourceName)
@@ -485,17 +481,17 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     asmgen.storeAIntoZpPointerVar(sourceName)
                 }
             }
-            "&", "and" -> {
+            "&" -> {
                 val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 asmgen.out("  and  #$value")
                 asmgen.storeAIntoZpPointerVar(sourceName)
             }
-            "|", "or" -> {
+            "|"-> {
                 val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 asmgen.out("  ora  #$value")
                 asmgen.storeAIntoZpPointerVar(sourceName)
             }
-            "^", "xor" -> {
+            "^" -> {
                 val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
                 asmgen.out("  eor  #$value")
                 asmgen.storeAIntoZpPointerVar(sourceName)
@@ -563,15 +559,15 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 +""")
                 }
             }
-            "&", "and" -> {
+            "&" -> {
                 asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                 asmgen.out("  and  $name |  sta  $name")
             }
-            "|", "or" -> {
+            "|" -> {
                 asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                 asmgen.out("  ora  $name |  sta  $name")
             }
-            "^", "xor" -> {
+            "^" -> {
                 asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                 asmgen.out("  eor  $name |  sta  $name")
             }
@@ -649,9 +645,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 +""")
                 }
             }
-            "&", "and" -> asmgen.out(" lda  $name |  and  $otherName |  sta  $name")
+            "&" -> asmgen.out(" lda  $name |  and  $otherName |  sta  $name")
-            "|", "or" -> asmgen.out(" lda  $name |  ora  $otherName |  sta  $name")
+            "|" -> asmgen.out(" lda  $name |  ora  $otherName |  sta  $name")
-            "^", "xor" -> asmgen.out(" lda  $name |  eor  $otherName |  sta  $name")
+            "^" -> asmgen.out(" lda  $name |  eor  $otherName |  sta  $name")
             "==" -> {
                 asmgen.out("""
                     lda  $otherName
@@ -740,9 +736,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     }
                 }
             }
-            "&", "and" -> asmgen.out(" lda  $name |  and  #$value |  sta  $name")
+            "&" -> asmgen.out(" lda  $name |  and  #$value |  sta  $name")
-            "|", "or" -> asmgen.out(" lda  $name |  ora  #$value |  sta  $name")
+            "|" -> asmgen.out(" lda  $name |  ora  #$value |  sta  $name")
-            "^", "xor" -> asmgen.out(" lda  $name |  eor  #$value |  sta  $name")
+            "^" -> asmgen.out(" lda  $name |  eor  #$value |  sta  $name")
             "==" -> {
                 asmgen.out("""
                     lda  $name
@@ -785,15 +781,15 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     sbc  P8ZP_SCRATCH_B1
                     sta  $name""")
             }
-            "|", "or" -> {
+            "|" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  ora  $name  |  sta  $name")
             }
-            "&", "and" -> {
+            "&" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  and  $name  |  sta  $name")
             }
-            "^", "xor" -> {
+            "^" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  eor  $name  |  sta  $name")
             }
@@ -828,11 +824,11 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     dec  $name+1
 +""")
             }
-            "|", "or" -> {
+            "|" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  ora  $name  |  sta  $name")
             }
-            "&", "and" -> {
+            "&" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  and  $name  |  sta  $name")
                 if(dt in WordDatatypes) {
@@ -842,7 +838,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                         asmgen.out("  lda  #0 |  sta  $name+1")
                 }
             }
-            "^", "xor" -> {
+            "^" -> {
                 asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                 asmgen.out("  eor  $name  |  sta  $name")
             }
@@ -1059,7 +1055,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     }
                 }
             }
-            "&", "and" -> {
+            "&" -> {
                 when {
                     value == 0 -> {
                         if(asmgen.isTargetCpu(CpuType.CPU65c02))
@@ -1096,7 +1092,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     else -> asmgen.out("  lda  $name |  and  #<$value |  sta  $name |  lda  $name+1 |  and  #>$value |  sta  $name+1")
                 }
             }
-            "|", "or" -> {
+            "|" -> {
                 when {
                     value == 0 -> {}
                     value and 255 == 0 -> asmgen.out("  lda  $name+1 |  ora  #>$value |  sta  $name+1")
@@ -1104,7 +1100,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                     else -> asmgen.out("  lda  $name |  ora  #<$value |  sta  $name |  lda  $name+1 |  ora  #>$value |  sta  $name+1")
                 }
             }
-            "^", "xor" -> {
+            "^" -> {
                 when {
                     value == 0 -> {}
                     value and 255 == 0 -> asmgen.out("  lda  $name+1 |  eor  #>$value |  sta  $name+1")
@@ -1268,7 +1264,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 +""")
                         }
                     }
-                    "&", "and" -> {
+                    "&" -> {
                         asmgen.out("  lda  $otherName |  and  $name |  sta  $name")
                         if(dt in WordDatatypes) {
                             if(asmgen.isTargetCpu(CpuType.CPU65c02))
@@ -1277,8 +1273,8 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                 asmgen.out("  lda  #0 |  sta  $name+1")
                         }
                     }
-                    "|", "or" -> asmgen.out("  lda  $otherName |  ora  $name |  sta  $name")
+                    "|" -> asmgen.out("  lda  $otherName |  ora  $name |  sta  $name")
-                    "^", "xor" -> asmgen.out("  lda  $otherName |  eor  $name |  sta  $name")
+                    "^" -> asmgen.out("  lda  $otherName |  eor  $name |  sta  $name")
                     else -> throw AssemblyError("invalid operator for in-place modification $operator")
                 }
             }
@@ -1349,9 +1345,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                         """)
                     }
                     "<<", ">>" -> throw AssemblyError("shift by a word value not supported, max is a byte")
-                    "&", "and" -> asmgen.out(" lda  $name |  and  $otherName |  sta  $name |  lda  $name+1 |  and  $otherName+1 |  sta  $name+1")
+                    "&" -> asmgen.out(" lda  $name |  and  $otherName |  sta  $name |  lda  $name+1 |  and  $otherName+1 |  sta  $name+1")
-                    "|", "or" -> asmgen.out(" lda  $name |  ora  $otherName |  sta  $name |  lda  $name+1 |  ora  $otherName+1 |  sta  $name+1")
+                    "|" -> asmgen.out(" lda  $name |  ora  $otherName |  sta  $name |  lda  $name+1 |  ora  $otherName+1 |  sta  $name+1")
-                    "^", "xor" -> asmgen.out(" lda  $name |  eor  $otherName |  sta  $name |  lda  $name+1 |  eor  $otherName+1 |  sta  $name+1")
+                    "^" -> asmgen.out(" lda  $name |  eor  $otherName |  sta  $name |  lda  $name+1 |  eor  $otherName+1 |  sta  $name+1")
                     else -> throw AssemblyError("invalid operator for in-place modification $operator")
                 }
             }
@@ -1521,7 +1517,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                             bne  -
 +""")
                     }
-                    "&", "and" -> {
+                    "&" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                         asmgen.out("  and  $name |  sta  $name")
                         if(dt in WordDatatypes) {
@@ -1531,11 +1527,11 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                                 asmgen.out("  lda  #0 |  sta  $name+1")
                         }
                     }
-                    "|", "or" -> {
+                    "|" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                         asmgen.out("  ora  $name |  sta  $name")
                     }
-                    "^", "xor" -> {
+                    "^" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
                         asmgen.out("  eor  $name |  sta  $name")
                     }
@@ -1567,15 +1563,15 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                         remainderVarByWordInAY()
                     }
                     "<<", ">>" -> throw AssemblyError("shift by a word value not supported, max is a byte")
-                    "&", "and" -> {
+                    "&" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.AY)
                         asmgen.out("  and  $name |  sta  $name |  tya |  and  $name+1 |  sta  $name+1")
                     }
-                    "|", "or" -> {
+                    "|" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.AY)
                         asmgen.out("  ora  $name |  sta  $name |  tya |  ora  $name+1 |  sta  $name+1")
                     }
-                    "^", "xor" -> {
+                    "^" -> {
                         asmgen.assignExpressionToRegister(value, RegisterOrPair.AY)
                         asmgen.out("  eor  $name |  sta  $name |  tya |  eor  $name+1 |  sta  $name+1")
                     }
@@ -1800,136 +1796,6 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
         }
     }
 
-    internal fun inplaceBooleanNot(target: AsmAssignTarget, dt: DataType) {
-        when (dt) {
-            DataType.UBYTE -> {
-                when (target.kind) {
-                    TargetStorageKind.VARIABLE -> {
-                        asmgen.out("""
-                            lda  ${target.asmVarname}
-                            beq  +
-                            lda  #1
-+                           eor  #1
-                            sta  ${target.asmVarname}""")
-                    }
-                    TargetStorageKind.MEMORY -> {
-                        val mem = target.memory!!
-                        when (mem.addressExpression) {
-                            is NumericLiteral -> {
-                                val addr = (mem.addressExpression as NumericLiteral).number.toHex()
-                                asmgen.out("""
-                                    lda  $addr
-                                    beq  +
-                                    lda  #1
-+                                   eor  #1
-                                    sta  $addr""")
-                            }
-                            is IdentifierReference -> {
-                                val sourceName = asmgen.loadByteFromPointerIntoA(mem.addressExpression as IdentifierReference)
-                                asmgen.out("""
-                                    beq  +
-                                    lda  #1
-+                                   eor  #1""")
-                                asmgen.storeAIntoZpPointerVar(sourceName)
-                            }
-                            else -> {
-                                asmgen.assignExpressionToVariable(mem.addressExpression, "P8ZP_SCRATCH_W2", DataType.UWORD, target.scope)
-                                asmgen.loadAFromZpPointerVar("P8ZP_SCRATCH_W2")
-                                asmgen.out("""
-                                    beq  +
-                                    lda  #1
-+                                   eor  #1""")
-                                asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2")
-                            }
-                        }
-                    }
-                    TargetStorageKind.REGISTER -> {
-                        when(target.register!!) {
-                            RegisterOrPair.A -> asmgen.out("""
-                                cmp  #0
-                                beq  +
-                                lda  #1
-+                               eor  #1""")
-                            RegisterOrPair.X -> asmgen.out("""
-                                txa
-                                beq  +
-                                lda  #1
-+                               eor  #1
-                                tax""")
-                            RegisterOrPair.Y -> asmgen.out("""
-                                tya
-                                beq  +
-                                lda  #1
-+                               eor  #1
-                                tay""")
-                            else -> throw AssemblyError("invalid reg dt for byte not")
-                        }
-                    }
-                    TargetStorageKind.STACK -> TODO("no asm gen for byte stack not")
-                    else -> throw AssemblyError("no asm gen for in-place not of ubyte ${target.kind}")
-                }
-            }
-            DataType.UWORD -> {
-                when (target.kind) {
-                    TargetStorageKind.VARIABLE -> {
-                        asmgen.out("""
-                            lda  ${target.asmVarname}
-                            ora  ${target.asmVarname}+1
-                            beq  +
-                            lda  #1
-+                           eor  #1
-                            sta  ${target.asmVarname}
-                            lsr  a
-                            sta  ${target.asmVarname}+1""")
-                    }
-                    TargetStorageKind.REGISTER -> {
-                        when(target.register!!) {
-                            RegisterOrPair.AX -> {
-                                asmgen.out("""
-                                    stx  P8ZP_SCRATCH_REG
-                                    ora  P8ZP_SCRATCH_REG
-                                    beq  +
-                                    lda  #0
-                                    tax
-                                    beq  ++
-        +                           lda  #1
-        +""")
-                            }
-                            RegisterOrPair.AY -> {
-                                asmgen.out("""
-                                    sty  P8ZP_SCRATCH_REG
-                                    ora  P8ZP_SCRATCH_REG
-                                    beq  +
-                                    lda  #0
-                                    tay
-                                    beq  ++
-        +                           lda  #1
-        +""")
-                            }
-                            RegisterOrPair.XY -> {
-                                asmgen.out("""
-                                    stx  P8ZP_SCRATCH_REG
-                                    tya
-                                    ora  P8ZP_SCRATCH_REG
-                                    beq  +
-                                    ldy  #0
-                                    ldx  #0
-                                    beq  ++
-        +                           ldx  #1
-        +""")
-                            }
-                            in Cx16VirtualRegisters -> throw AssemblyError("cx16 virtual regs should be variables, not real registers")
-                            else -> throw AssemblyError("invalid reg dt for word not")
-                        }
-                    }
-                    TargetStorageKind.STACK -> TODO("no asm gen for word stack not")
-                    else -> throw AssemblyError("no asm gen for in-place not of uword for ${target.kind}")
-                }
-            }
-            else -> throw AssemblyError("boolean-not of invalid type")
-        }
-    }
-
     internal fun inplaceInvert(target: AsmAssignTarget, dt: DataType) {
         when (dt) {
             DataType.UBYTE -> {

codeGenExperimental/build.gradle

@@ -24,8 +24,9 @@ compileTestKotlin {
 }
 
 dependencies {
-    implementation project(':codeAst')
     implementation project(':codeCore')
+    implementation project(':intermediate')
+    implementation project(':codeGenIntermediate')
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     // implementation "org.jetbrains.kotlin:kotlin-reflect"
     implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.16"

codeGenExperimental/codeGenExperimental.iml

@@ -10,7 +10,8 @@
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
     <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
-    <orderEntry type="module" module-name="codeAst" />
+    <orderEntry type="module" module-name="codeGenIntermediate" />
+    <orderEntry type="module" module-name="intermediate" />
     <orderEntry type="module" module-name="codeCore" />
   </component>
 </module>

codeGenExperimental/src/prog8/codegen/experimental/AsmGen.kt

@@ -1,39 +0,0 @@
-package prog8.codegen.experimental
-
-import prog8.code.SymbolTable
-import prog8.code.ast.PtProgram
-import prog8.code.core.CompilationOptions
-import prog8.code.core.IAssemblyGenerator
-import prog8.code.core.IAssemblyProgram
-import prog8.code.core.IErrorReporter
-
-/*
-
-    NOTE: The goal is to keep the dependencies as lean as possible! For now, we depend only on:
-         - codeAst (the 'lean' new AST and the SymbolTable)
-         - codeCore (various base enums and interfaces)
-
-    This *should* be enough to build a complete code generator with. But we'll see :)
-
- */
-
-
-class AsmGen(internal val program: PtProgram,
-             internal val symbolTable: SymbolTable,
-             internal val options: CompilationOptions,
-             internal val errors: IErrorReporter
-): IAssemblyGenerator {
-
-    override fun compileToAssembly(): IAssemblyProgram? {
-
-        println("\n** experimental code generator **\n")
-
-        println("Writing AST into XML form...")
-        val xmlConv = AstToXmlConverter(program, symbolTable, options)
-        xmlConv.writeXml()
-
-        println("..todo: create assembly program into ${options.outputDir.toAbsolutePath()}..")
-
-        return AssemblyProgram("dummy")
-    }
-}

codeGenExperimental/src/prog8/codegen/experimental/AssemblyProgram.kt

@@ -1,13 +0,0 @@
-package prog8.codegen.experimental
-
-import prog8.code.core.CompilationOptions
-import prog8.code.core.IAssemblyProgram
-
-
-internal class AssemblyProgram(override val name: String) : IAssemblyProgram
-{
-    override fun assemble(options: CompilationOptions): Boolean {
-        println("..todo: assemble code into binary..")
-        return true
-    }
-}

codeGenExperimental/src/prog8/codegen/experimental/AstToXmlConverter.kt

@@ -1,657 +0,0 @@
-package prog8.codegen.experimental
-
-import prog8.code.*
-import prog8.code.ast.*
-import prog8.code.core.*
-import javax.xml.stream.XMLOutputFactory
-import kotlin.io.path.Path
-import kotlin.io.path.absolutePathString
-import kotlin.io.path.div
-
-/*
-
-    NOTE: The goal is to keep the dependencies as lean as possible! For now, we depend only on:
-         - codeAst (the 'lean' new AST and the SymbolTable)
-         - codeCore (various base enums and interfaces)
-
-    This *should* be enough to build a complete code generator with. But we'll see :)
-
- */
-
-
-class AstToXmlConverter(internal val program: PtProgram,
-                        internal val symbolTable: SymbolTable,
-                        internal val options: CompilationOptions
-) {
-
-    private lateinit var xml: IndentingXmlWriter
-
-    fun writeXml() {
-        val writer = (options.outputDir / Path(program.name+"-ast.xml")).toFile().printWriter()
-        xml = IndentingXmlWriter(XMLOutputFactory.newFactory().createXMLStreamWriter(writer))
-        xml.doc()
-        xml.elt("program")
-        xml.attr("name", program.name)
-        xml.startChildren()
-        writeOptions(options)
-        program.children.forEach { writeNode(it) }
-        writeSymboltable(symbolTable)
-        xml.endElt()
-        xml.endDoc()
-        xml.close()
-    }
-
-    private fun writeSymboltable(st: SymbolTable) {
-        xml.elt("symboltable")
-        xml.startChildren()
-        st.flat.forEach{ (name, entry) ->
-            xml.elt("entry")
-            xml.attr("name", name.joinToString("."))
-            xml.attr("type", entry.type.name)
-            xml.startChildren()
-            writeStNode(entry)
-            xml.endElt()
-        }
-        xml.endElt()
-    }
-
-    private fun writeStNode(node: StNode) {
-        when(node.type) {
-            StNodeType.GLOBAL,
-            StNodeType.LABEL,
-            StNodeType.BLOCK,
-            StNodeType.BUILTINFUNC,
-            StNodeType.SUBROUTINE -> {/* no additional info*/}
-            StNodeType.ROMSUB -> {
-                node as StRomSub
-                xml.elt("romsub")
-                xml.attr("address", node.address.toString())
-                xml.endElt()
-            }
-            StNodeType.STATICVAR -> {
-                node as StStaticVariable
-                xml.elt("var")
-                xml.attr("type", node.dt.name)
-                xml.attr("zpwish", node.zpwish.name)
-                if(node.length!=null)
-                    xml.attr("length", node.length.toString())
-                if(node.initialNumericValue!=null || node.initialArrayValue!=null || node.initialStringValue!=null) {
-                    xml.startChildren()
-                    if(node.initialNumericValue!=null) {
-                        writeNumber(node.dt, node.initialNumericValue!!)
-                    }
-                    if(node.initialStringValue!=null) {
-                        xml.writeTextNode(
-                            "string",
-                            listOf(Pair("encoding", node.initialStringValue!!.second.name)),
-                            node.initialStringValue!!.first,
-                            false
-                        )
-                    }
-                    if(node.initialArrayValue!=null) {
-                        xml.elt("array")
-                        xml.startChildren()
-                        val eltDt = ArrayToElementTypes.getValue(node.dt)
-                        node.initialArrayValue!!.forEach {
-                            if(it.number!=null) {
-                                writeNumber(eltDt, it.number!!)
-                            }
-                            if(it.addressOf!=null) {
-                                xml.elt("addressof")
-                                xml.attr("symbol", it.addressOf!!.joinToString("."))
-                                xml.endElt()
-                            }
-                        }
-                        xml.endElt()
-                    }
-                }
-                xml.endElt()
-            }
-            StNodeType.MEMVAR -> {
-                node as StMemVar
-                xml.writeTextNode("memvar",
-                    listOf(Pair("type", node.dt.name)),
-                    node.address.toString(),
-                    false)
-            }
-            StNodeType.CONSTANT -> {
-                node as StConstant
-                xml.writeTextNode("const",
-                    listOf(Pair("type", node.dt.name)),
-                    intOrDouble(node.dt, node.value).toString(),
-                    false)
-            }
-        }
-    }
-
-    private fun writeOptions(options: CompilationOptions) {
-        xml.elt("options")
-        xml.attr("target", options.compTarget.name)
-        xml.attr("output", options.output.name)
-        xml.attr("launcher", options.launcher.name)
-        xml.attr("zeropage", options.zeropage.name)
-        xml.attr("loadaddress", options.loadAddress.toString())
-        xml.attr("floatsenabled", options.floats.toString())
-        xml.attr("nosysinit", options.noSysInit.toString())
-        xml.attr("dontreinitglobals", options.dontReinitGlobals.toString())
-        xml.attr("optimize", options.optimize.toString())
-        if(options.zpReserved.isNotEmpty()) {
-            xml.startChildren()
-            options.zpReserved.forEach {
-                xml.elt("zpreserved")
-                xml.attr("from", it.first.toString())
-                xml.attr("to", it.last.toString())
-                xml.endElt()
-            }
-        }
-        xml.endElt()
-    }
-
-    private fun writeNode(it: PtNode) {
-        when(it) {
-            is PtBlock -> write(it)
-            is PtSub -> write(it)
-            is PtVariable -> write(it)
-            is PtAssignment -> write(it)
-            is PtConstant -> write(it)
-            is PtAsmSub -> write(it)
-            is PtAddressOf -> write(it)
-            is PtArrayIndexer -> write(it)
-            is PtArray -> write(it)
-            is PtBinaryExpression -> write(it)
-            is PtBuiltinFunctionCall -> write(it)
-            is PtConditionalBranch -> write(it)
-            is PtContainmentCheck -> write(it)
-            is PtForLoop -> write(it)
-            is PtFunctionCall -> write(it)
-            is PtIdentifier -> write(it)
-            is PtIfElse -> write(it)
-            is PtInlineAssembly -> write(it)
-            is PtIncludeBinary -> write(it)
-            is PtJump -> write(it)
-            is PtMemoryByte -> write(it)
-            is PtMemMapped -> write(it)
-            is PtNumber -> write(it)
-            is PtPostIncrDecr -> write(it)
-            is PtPrefix -> write(it)
-            is PtRange -> write(it)
-            is PtRepeatLoop -> write(it)
-            is PtReturn -> write(it)
-            is PtString -> write(it)
-            is PtTypeCast -> write(it)
-            is PtWhen -> write(it)
-            is PtWhenChoice -> write(it)
-            is PtLabel -> write(it)
-            is PtNop -> {}
-            is PtBreakpoint -> write(it)
-            is PtScopeVarsDecls -> write(it)
-            is PtNodeGroup -> it.children.forEach { writeNode(it) }
-            else -> TODO("$it")
-        }
-    }
-
-    private fun write(vars: PtScopeVarsDecls) {
-        xml.elt("vars")
-        xml.startChildren()
-        vars.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(breakPt: PtBreakpoint) {
-        xml.elt("breakpoint")
-        xml.pos(breakPt.position)
-        xml.endElt()
-    }
-
-    private fun write(array: PtArray) {
-        xml.elt("array")
-        xml.attr("type", array.type.name)
-        xml.startChildren()
-        array.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(prefix: PtPrefix) {
-        xml.elt("prefix")
-        xml.attr("op", prefix.operator)
-        xml.attr("type", prefix.type.name)
-        xml.startChildren()
-        xml.elt("value")
-        xml.startChildren()
-        writeNode(prefix.value)
-        xml.endElt()
-        xml.endElt()
-    }
-
-    private fun write(string: PtString) =
-        xml.writeTextNode("string", listOf(Pair("encoding", string.encoding.name)), string.value, false)
-
-    private fun write(rept: PtRepeatLoop) {
-        xml.elt("repeat")
-        xml.pos(rept.position)
-        xml.startChildren()
-        xml.elt("count")
-        xml.startChildren()
-        writeNode(rept.count)
-        xml.endElt()
-        writeNode(rept.statements)
-        xml.endElt()
-    }
-
-    private fun write(branch: PtConditionalBranch) {
-        xml.elt("conditionalbranch")
-        xml.attr("condition", branch.condition.name)
-        xml.pos(branch.position)
-        xml.startChildren()
-        xml.elt("true")
-        xml.startChildren()
-        writeNode(branch.trueScope)
-        xml.endElt()
-        if(branch.falseScope.children.isNotEmpty()) {
-            xml.elt("false")
-            xml.startChildren()
-            writeNode(branch.falseScope)
-            xml.endElt()
-        }
-        xml.endElt()
-    }
-
-    private fun write(check: PtContainmentCheck) {
-        xml.elt("containment")
-        xml.attr("type", check.type.name)
-        xml.startChildren()
-        xml.elt("element")
-        xml.startChildren()
-        writeNode(check.children[0])
-        xml.endElt()
-        xml.elt("iterable")
-        xml.startChildren()
-        writeNode(check.children[1])
-        xml.endElt()
-        xml.endElt()
-    }
-
-    private fun write(range: PtRange) {
-        xml.elt("range")
-        xml.attr("type", range.type.name)
-        xml.startChildren()
-        xml.elt("from")
-        xml.startChildren()
-        writeNode(range.from)
-        xml.endElt()
-        xml.elt("to")
-        xml.startChildren()
-        writeNode(range.to)
-        xml.endElt()
-        xml.elt("step")
-        xml.startChildren()
-        writeNode(range.step)
-        xml.endElt()
-        xml.endElt()
-    }
-
-    private fun write(forLoop: PtForLoop) {
-        xml.elt("for")
-        xml.attr("loopvar", strTargetName(forLoop.variable))
-        xml.pos(forLoop.position)
-        xml.startChildren()
-        xml.elt("iterable")
-        xml.startChildren()
-        writeNode(forLoop.iterable)
-        xml.endElt()
-        writeNode(forLoop.statements)
-        xml.endElt()
-    }
-
-    private fun write(membyte: PtMemoryByte) {
-        xml.elt("membyte")
-        xml.attr("type", membyte.type.name)
-        xml.startChildren()
-        xml.elt("address")
-        xml.startChildren()
-        writeNode(membyte.address)
-        xml.endElt()
-        xml.endElt()
-    }
-
-    private fun write(whenStmt: PtWhen) {
-        xml.elt("when")
-        xml.pos(whenStmt.position)
-        xml.startChildren()
-        xml.elt("value")
-        xml.startChildren()
-        writeNode(whenStmt.value)
-        xml.endElt()
-        xml.elt("choices")
-        xml.startChildren()
-        writeNode(whenStmt.choices)
-        xml.endElt()
-        xml.endElt()
-    }
-
-    private fun write(choice: PtWhenChoice) {
-        xml.elt("choice")
-        if(choice.isElse) {
-            xml.attr("else", "true")
-            xml.startChildren()
-        } else {
-            xml.startChildren()
-            xml.elt("values")
-            xml.startChildren()
-            writeNode(choice.values)
-            xml.endElt()
-        }
-        writeNode(choice.statements)
-        xml.endElt()
-    }
-
-    private fun write(inlineAsm: PtInlineAssembly) {
-        xml.elt("assembly")
-        xml.pos(inlineAsm.position)
-        xml.startChildren()
-        xml.writeTextNode("code", emptyList(), inlineAsm.assembly)
-        xml.endElt()
-    }
-
-    private fun write(inlineBinary: PtIncludeBinary) {
-        xml.elt("binary")
-        xml.attr("filename", inlineBinary.file.absolutePathString())
-        if(inlineBinary.offset!=null)
-            xml.attr("offset", inlineBinary.offset!!.toString())
-        if(inlineBinary.length!=null)
-            xml.attr("length", inlineBinary.length!!.toString())
-        xml.pos(inlineBinary.position)
-        xml.endElt()
-    }
-
-    private fun write(fcall: PtBuiltinFunctionCall) {
-        xml.elt("builtinfcall")
-        xml.attr("name", fcall.name)
-        if(fcall.void)
-            xml.attr("type", "VOID")
-        else
-            xml.attr("type", fcall.type.name)
-        xml.startChildren()
-        fcall.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(cast: PtTypeCast) {
-        xml.elt("cast")
-        xml.attr("type", cast.type.name)
-        xml.startChildren()
-        writeNode(cast.value)
-        xml.endElt()
-    }
-
-    private fun write(aix: PtArrayIndexer) {
-        xml.elt("arrayindexed")
-        xml.attr("type", aix.type.name)
-        xml.startChildren()
-        write(aix.variable)
-        writeNode(aix.index)
-        xml.endElt()
-    }
-
-    private fun write(binexpr: PtBinaryExpression) {
-        xml.elt("binexpr")
-        xml.attr("op", binexpr.operator)
-        xml.attr("type", binexpr.type.name)
-        xml.startChildren()
-        writeNode(binexpr.left)
-        writeNode(binexpr.right)
-        xml.endElt()
-    }
-
-    private fun write(addrof: PtAddressOf) {
-        xml.elt("addressof")
-        xml.attr("symbol", strTargetName(addrof.identifier))
-        xml.endElt()
-    }
-
-    private fun write(fcall: PtFunctionCall) {
-        xml.elt("fcall")
-        xml.attr("name", strTargetName(fcall))
-        if(fcall.void)
-            xml.attr("type", "VOID")
-        else
-            xml.attr("type", fcall.type.name)
-        xml.pos(fcall.position)
-        xml.startChildren()
-        fcall.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(number: PtNumber) = writeNumber(number.type, number.number)
-
-    private fun writeNumber(type: DataType, number: Double) =
-        xml.writeTextNode("number", listOf(Pair("type", type.name)), intOrDouble(type, number).toString(), false)
-
-    private fun write(symbol: PtIdentifier) {
-        xml.elt("symbol")
-        xml.attr("name", strTargetName(symbol))
-        xml.attr("type", symbol.type.name)
-        xml.endElt()
-    }
-
-    private fun write(assign: PtAssignment) {
-        xml.elt("assign")
-        xml.pos(assign.position)
-        xml.startChildren()
-        write(assign.target)
-        writeNode(assign.value)
-        xml.endElt()
-    }
-
-    private fun write(ifElse: PtIfElse) {
-        xml.elt("ifelse")
-        xml.pos(ifElse.position)
-        xml.startChildren()
-        xml.elt("condition")
-        xml.startChildren()
-        writeNode(ifElse.condition)
-        xml.endElt()
-        xml.elt("true")
-        xml.pos(ifElse.ifScope.position)
-        xml.startChildren()
-        writeNode(ifElse.ifScope)
-        xml.endElt()
-        if(ifElse.elseScope.children.isNotEmpty()) {
-            xml.elt("false")
-            xml.pos(ifElse.elseScope.position)
-            xml.startChildren()
-            writeNode(ifElse.elseScope)
-            xml.endElt()
-        }
-        xml.endElt()
-    }
-
-    private fun write(ret: PtReturn) {
-        xml.elt("return")
-        if(ret.hasValue) {
-            xml.startChildren()
-            writeNode(ret.value!!)
-        }
-        xml.endElt()
-    }
-
-    private fun write(incdec: PtPostIncrDecr) {
-        if(incdec.operator=="++") xml.elt("inc") else xml.elt("dec")
-        xml.startChildren()
-        write(incdec.target)
-        xml.endElt()
-    }
-
-    private fun write(label: PtLabel) {
-        xml.elt("label")
-        xml.attr("name", label.scopedName.joinToString("."))
-        xml.pos(label.position)
-        xml.endElt()
-    }
-
-    private fun write(block: PtBlock) {
-        xml.elt("block")
-        xml.attr("name", block.scopedName.joinToString("."))
-        if(block.address!=null)
-            xml.attr("address", block.address!!.toString())
-        xml.attr("library", block.library.toString())
-        xml.pos(block.position)
-        xml.startChildren()
-        block.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(memMapped: PtMemMapped) {
-        xml.writeTextNode("memvar",
-            listOf(
-                Pair("name", memMapped.scopedName.joinToString(".")),
-                Pair("type", memMapped.type.name)
-            ),
-            memMapped.address.toString(),
-            false)
-    }
-
-    private fun write(target: PtAssignTarget) {
-        xml.elt("target")
-        xml.startChildren()
-        if(target.identifier!=null) {
-            writeNode(target.identifier!!)
-        } else if(target.memory!=null) {
-            writeNode(target.memory!!)
-        } else if(target.array!=null) {
-            writeNode(target.array!!)
-        } else
-            throw InternalCompilerException("weird assign target")
-        xml.endElt()
-    }
-
-    private fun write(jump: PtJump) {
-        xml.elt("jump")
-        if(jump.identifier!=null) xml.attr("symbol", strTargetName(jump.identifier!!))
-        else if(jump.address!=null) xml.attr("address", jump.address!!.toString())
-        else if(jump.generatedLabel!=null) xml.attr("label", jump.generatedLabel!!)
-        else
-            throw InternalCompilerException("weird jump target")
-        xml.endElt()
-    }
-
-    private fun write(sub: PtSub) {
-        xml.elt("sub")
-        xml.attr("name", sub.scopedName.joinToString("."))
-        if(sub.inline)
-            xml.attr("inline", "true")
-        xml.attr("returntype", sub.returntype?.toString() ?: "VOID")
-        xml.pos(sub.position)
-        xml.startChildren()
-        if(sub.parameters.isNotEmpty()) {
-            xml.elt("parameters")
-            xml.startChildren()
-            sub.parameters.forEach { write(it) }
-            xml.endElt()
-        }
-        sub.children.forEach { writeNode(it) }
-        xml.endElt()
-    }
-
-    private fun write(parameter: PtSubroutineParameter, registerOrStatusflag: RegisterOrStatusflag? = null) {
-        xml.elt("param")
-        xml.attr("name", parameter.name)
-        xml.attr("type", parameter.type.name)
-        if(registerOrStatusflag?.statusflag!=null) {
-            xml.attr("statusflag", registerOrStatusflag.statusflag!!.toString())
-        }
-        if(registerOrStatusflag?.registerOrPair!=null){
-            xml.attr("registers", registerOrStatusflag.registerOrPair!!.name)
-        }
-        xml.endElt()
-    }
-
-    private fun write(asmSub: PtAsmSub) {
-        if(asmSub.address!=null) {
-            xml.elt("romsub")
-            xml.attr("name", asmSub.scopedName.joinToString("."))
-            xml.attr("address", asmSub.address!!.toString())
-            if(asmSub.inline)
-                xml.attr("inline", "true")
-            xml.pos(asmSub.position)
-            xml.startChildren()
-            paramsEtcetera(asmSub)
-            xml.endElt()
-        }
-        else {
-            xml.elt("asmsub")
-            xml.attr("name", asmSub.scopedName.joinToString("."))
-            if(asmSub.inline)
-                xml.attr("inline", "true")
-            xml.pos(asmSub.position)
-            xml.startChildren()
-            paramsEtcetera(asmSub)
-            xml.elt("code")
-            xml.startChildren()
-            asmSub.children.forEach { writeNode(it) }
-            xml.endElt()
-            xml.endElt()
-        }
-    }
-
-    private fun paramsEtcetera(asmSub: PtAsmSub) {
-        if(asmSub.parameters.isNotEmpty()) {
-            xml.elt("parameters")
-            xml.startChildren()
-            asmSub.parameters.forEach { (param, reg) -> write(param, reg) }
-            xml.endElt()
-        }
-        if(asmSub.clobbers.isNotEmpty()) {
-            xml.elt("clobbers")
-            xml.attr("registers", asmSub.clobbers.joinToString(",") { it.name })
-            xml.endElt()
-        }
-        if(asmSub.retvalRegisters.isNotEmpty()) {
-            xml.elt("returns")
-            xml.startChildren()
-            asmSub.retvalRegisters.forEach {
-                xml.elt("register")
-                if(it.statusflag!=null)
-                    xml.attr("statusflag", it.statusflag!!.toString())
-                if(it.registerOrPair!=null)
-                    xml.attr("registers", it.registerOrPair!!.toString())
-                xml.endElt()
-            }
-            xml.endElt()
-        }
-    }
-
-    private fun write(constant: PtConstant) {
-        xml.writeTextNode("const",
-            listOf(
-                Pair("name", constant.scopedName.joinToString(".")),
-                Pair("type", constant.type.name)
-            ),
-            intOrDouble(constant.type, constant.value).toString(), false)
-    }
-
-    private fun write(variable: PtVariable) {
-        // the variable declaration nodes are still present in the Ast,
-        // but the Symboltable should be used look up their details.
-        xml.elt("vardecl")
-        xml.attr("name", variable.scopedName.joinToString("."))
-        xml.attr("type", variable.type.name)
-        if(variable.arraySize!=null)
-            xml.attr("arraysize", variable.arraySize.toString())
-        if(variable.value!=null) {
-            // static initialization value
-            xml.startChildren()
-            writeNode(variable.value!!)
-        }
-        xml.endElt()
-    }
-
-
-
-    private fun strTargetName(ident: PtIdentifier): String = ident.targetName.joinToString(".")
-
-    private fun strTargetName(call: PtFunctionCall): String = call.functionName.joinToString(".")
-
-    private fun intOrDouble(type: DataType, value: Double): Number =
-        if(type in IntegerDatatypes) value.toInt() else value
-}

codeGenExperimental/src/prog8/codegen/experimental/CodeGen.kt

@@ -0,0 +1,30 @@
+package prog8.codegen.experimental
+
+import prog8.code.SymbolTable
+import prog8.code.ast.PtProgram
+import prog8.code.core.CompilationOptions
+import prog8.code.core.IAssemblyGenerator
+import prog8.code.core.IAssemblyProgram
+import prog8.code.core.IErrorReporter
+import prog8.codegen.intermediate.IRCodeGen
+import prog8.intermediate.IRFileWriter
+
+class CodeGen(private val program: PtProgram,
+              private val symbolTable: SymbolTable,
+              private val options: CompilationOptions,
+              private val errors: IErrorReporter
+): IAssemblyGenerator {
+    override fun compileToAssembly(): IAssemblyProgram? {
+
+        // you could write a code generator directly on the PtProgram AST,
+        // but you can also use the Intermediate Representation to build a codegen on:
+        val irCodeGen = IRCodeGen(program, symbolTable, options, errors)
+        val irProgram = irCodeGen.generate()
+
+        // this stub only writes the IR program to disk but doesn't generate anything else.
+        IRFileWriter(irProgram).writeFile()
+
+        println("** experimental codegen stub: no assembly generated **")
+        return null
+    }
+}

codeGenExperimental/src/prog8/codegen/experimental/IndentingXmlWriter.kt

@@ -1,89 +0,0 @@
-package prog8.codegen.experimental
-
-import prog8.code.core.Position
-import java.util.*
-import javax.xml.stream.XMLStreamWriter
-
-class IndentingXmlWriter(val xml: XMLStreamWriter): XMLStreamWriter by xml {
-    private var indent = 0
-    private var content = Stack<Boolean>()
-
-    fun doc(version: String? = null) = if(version==null) writeStartDocument() else writeStartDocument(version)
-    fun endDoc() = writeEndDocument()
-    fun elt(name: String) = writeStartElement(name)
-    fun attr(name: String, value: String) = writeAttribute(name, value)
-    fun attrs(attributes: List<Pair<String, String>>) = attributes.forEach { writeAttribute(it.first, it.second) }
-    fun startChildren() {
-        xml.writeCharacters("\n")
-        content.pop()
-        content.push(true)
-    }
-    fun endElt(writeIndent: Boolean=true) = writeEndElement(writeIndent)
-    fun pos(pos: Position) = writeAttribute("src", pos.toString())
-    fun comment(text: String) {
-        writeComment(text)
-        writeCharacters("\n")
-    }
-
-    override fun writeStartDocument() {
-        xml.writeStartDocument()
-        xml.writeCharacters("\n")
-        content.push(true)
-    }
-
-    override fun writeStartDocument(version: String) {
-        xml.writeStartDocument(version)
-        xml.writeCharacters("\n")
-        content.push(true)
-    }
-
-    override fun writeEndDocument() {
-        xml.writeEndDocument()
-        xml.writeCharacters("\n")
-        require(indent==0)
-        require(content.size==1)
-    }
-
-    override fun writeStartElement(name: String) {
-        xml.writeCharacters("  ".repeat(indent))
-        xml.writeStartElement(name)
-        indent++
-        content.push(false)
-    }
-
-    override fun writeStartElement(name: String, ns: String) {
-        xml.writeCharacters("  ".repeat(indent))
-        xml.writeStartElement(name, ns)
-        indent++
-        content.push(false)
-    }
-
-    fun writeEndElement(writeIndents: Boolean) {
-        indent--
-        if(content.pop() && writeIndents)
-            xml.writeCharacters("  ".repeat(indent))
-        xml.writeEndElement()
-        xml.writeCharacters("\n")
-    }
-
-    override fun writeEndElement() = writeEndElement(true)
-
-    override fun writeStartElement(name: String, ns: String, p2: String) {
-        xml.writeCharacters("  ".repeat(indent))
-        xml.writeStartElement(name, ns, p2)
-        indent++
-        content.push(false)
-    }
-
-    fun writeTextNode(name: String, attrs: List<Pair<String, String>>, text: String, cdata: Boolean = true) {
-        xml.writeCharacters("  ".repeat(indent))
-        xml.writeStartElement(name)
-        attrs.forEach { (name, value) -> xml.writeAttribute(name, value) }
-        if(cdata)
-            xml.writeCData(text)
-        else
-            xml.writeCharacters(text)
-        xml.writeEndElement()
-        xml.writeCharacters("\n")
-    }
-}

codeGenIntermediate/build.gradle

@@ -0,0 +1,64 @@
+
+plugins {
+    id 'java'
+    id 'application'
+    id "org.jetbrains.kotlin.jvm"
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(javaVersion)
+    }
+}
+
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = javaVersion
+    }
+}
+
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = javaVersion
+    }
+}
+
+dependencies {
+    implementation project(':codeCore')
+    implementation project(':intermediate')
+    implementation project(':virtualmachine')
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    // implementation "org.jetbrains.kotlin:kotlin-reflect"
+    implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.16"
+
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:5.3.2'
+}
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ["${project.projectDir}/src"]
+        }
+        resources {
+            srcDirs = ["${project.projectDir}/res"]
+        }
+    }
+    test {
+        java {
+            srcDir "${project.projectDir}/test"
+        }
+    }
+}
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "skipped", "failed"
+    }
+}

codeGenIntermediate/codeGenIntermediate.iml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+    <orderEntry type="module" module-name="codeCore" />
+    <orderEntry type="module" module-name="intermediate" />
+    <orderEntry type="module" module-name="virtualmachine" />
+    <orderEntry type="library" name="io.kotest.assertions.core.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
+  </component>
+</module>

codeGenIntermediate/src/prog8/codegen/intermediate/AssignmentGen.kt

@@ -1,15 +1,18 @@
-package prog8.codegen.virtual
+package prog8.codegen.intermediate
 
 import prog8.code.ast.*
 import prog8.code.core.AssemblyError
 import prog8.code.core.DataType
+import prog8.code.core.Position
 import prog8.code.core.SignedDatatypes
-import prog8.vm.Opcode
+import prog8.intermediate.IRCodeChunk
-import prog8.vm.VmDataType
+import prog8.intermediate.IRCodeInstruction
+import prog8.intermediate.Opcode
+import prog8.intermediate.VmDataType
 
-internal class AssignmentGen(private val codeGen: CodeGen, private val expressionEval: ExpressionGen) {
+internal class AssignmentGen(private val codeGen: IRCodeGen, private val expressionEval: ExpressionGen) {
 
-    internal fun translate(assignment: PtAssignment): VmCodeChunk {
+    internal fun translate(assignment: PtAssignment): IRCodeChunk {
         if(assignment.target.children.single() is PtMachineRegister)
             throw AssemblyError("assigning to a register should be done by just evaluating the expression into resultregister")
 
@@ -19,56 +22,78 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
             translateRegularAssign(assignment)
     }
 
-    private fun translateInplaceAssign(assignment: PtAssignment): VmCodeChunk {
+    private fun translateInplaceAssign(assignment: PtAssignment): IRCodeChunk {
         val ident = assignment.target.identifier
         val memory = assignment.target.memory
         val array = assignment.target.array
 
         return if(ident!=null) {
-            val address = codeGen.allocations.get(ident.targetName)
+            assignSelfInMemory(ident.targetName.joinToString("."), assignment.value, assignment)
-            assignSelfInMemory(address, assignment.value, assignment)
         } else if(memory != null) {
             if(memory.address is PtNumber)
-                assignSelfInMemory((memory.address as PtNumber).number.toInt(), assignment.value, assignment)
+                assignSelfInMemoryKnownAddress((memory.address as PtNumber).number.toInt(), assignment.value, assignment)
             else
                 fallbackAssign(assignment)
         } else if(array!=null) {
-            // TODO in-place array element assignment?
+            // NOTE: naive fallback assignment here will sometimes generate code that loads the index value multiple times
+            // in a register. It's way too much work to optimize that here - instead, we trust that the generated IL assembly
+            // will be optimized later and have the double assignments removed.
             fallbackAssign(assignment)
         } else {
             fallbackAssign(assignment)
         }
     }
 
-    private fun assignSelfInMemory(
+    private fun assignSelfInMemoryKnownAddress(
         address: Int,
         value: PtExpression,
         origAssign: PtAssignment
-    ): VmCodeChunk {
+    ): IRCodeChunk {
         val vmDt = codeGen.vmType(value.type)
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(origAssign.position)
         when(value) {
             is PtIdentifier -> return code // do nothing, x=x null assignment.
             is PtMachineRegister -> return code // do nothing, reg=reg null assignment
-            is PtPrefix -> return inplacePrefix(value.operator, vmDt, address)
+            is PtPrefix -> return inplacePrefix(value.operator, vmDt, address, null, value.position)
-            is PtBinaryExpression -> return inplaceBinexpr(value.operator, value.right, vmDt, value.type in SignedDatatypes, address, origAssign)
+            is PtBinaryExpression -> return inplaceBinexpr(value.operator, value.right, vmDt, value.type in SignedDatatypes, address, null, origAssign)
             is PtMemoryByte -> {
                 return if (!codeGen.options.compTarget.machine.isIOAddress(address.toUInt()))
                     code // do nothing, mem=mem null assignment.
                 else {
                     // read and write a (i/o) memory location to itself.
                     val tempReg = codeGen.vmRegisters.nextFree()
-                    code += VmCodeInstruction(Opcode.LOADM, vmDt, reg1 = tempReg, value = address)
+                    code += IRCodeInstruction(Opcode.LOADM, vmDt, reg1 = tempReg, value = address)
-                    code += VmCodeInstruction(Opcode.STOREM, vmDt, reg1 = tempReg, value = address)
+                    code += IRCodeInstruction(Opcode.STOREM, vmDt, reg1 = tempReg, value = address)
                     code
                 }
             }
             else -> return fallbackAssign(origAssign)
         }
-
     }
 
-    private fun fallbackAssign(origAssign: PtAssignment): VmCodeChunk {
+    private fun assignSelfInMemory(
+        symbol: String,
+        value: PtExpression,
+        origAssign: PtAssignment
+    ): IRCodeChunk {
+        val vmDt = codeGen.vmType(value.type)
+        val code = IRCodeChunk(origAssign.position)
+        when(value) {
+            is PtIdentifier -> return code // do nothing, x=x null assignment.
+            is PtMachineRegister -> return code // do nothing, reg=reg null assignment
+            is PtPrefix -> return inplacePrefix(value.operator, vmDt, null, symbol, value.position)
+            is PtBinaryExpression -> return inplaceBinexpr(value.operator, value.right, vmDt, value.type in SignedDatatypes, null, symbol, origAssign)
+            is PtMemoryByte -> {
+                val tempReg = codeGen.vmRegisters.nextFree()
+                code += IRCodeInstruction(Opcode.LOADM, vmDt, reg1 = tempReg, labelSymbol = symbol)
+                code += IRCodeInstruction(Opcode.STOREM, vmDt, reg1 = tempReg, labelSymbol = symbol)
+                return code
+            }
+            else -> return fallbackAssign(origAssign)
+        }
+    }
+
+    private fun fallbackAssign(origAssign: PtAssignment): IRCodeChunk {
         if (codeGen.options.slowCodegenWarnings)
             codeGen.errors.warn("indirect code for in-place assignment", origAssign.position)
         return translateRegularAssign(origAssign)
@@ -79,53 +104,73 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
         operand: PtExpression,
         vmDt: VmDataType,
         signed: Boolean,
-        address: Int,
+        knownAddress: Int?,
+        symbol: String?,
         origAssign: PtAssignment
-    ): VmCodeChunk {
+    ): IRCodeChunk {
+        if(knownAddress!=null) {
             when (operator) {
-            "+" -> return expressionEval.operatorPlusInplace(address, vmDt, operand)
+                "+" -> return expressionEval.operatorPlusInplace(knownAddress, null, vmDt, operand)
-            "-" -> return expressionEval.operatorMinusInplace(address, vmDt, operand)
+                "-" -> return expressionEval.operatorMinusInplace(knownAddress, null, vmDt, operand)
-            "*" -> return expressionEval.operatorMultiplyInplace(address, vmDt, operand)
+                "*" -> return expressionEval.operatorMultiplyInplace(knownAddress, null, vmDt, operand)
-            "/" -> return expressionEval.operatorDivideInplace(address, vmDt, signed, operand)
+                "/" -> return expressionEval.operatorDivideInplace(knownAddress, null, vmDt, signed, operand)
-            "|" -> return expressionEval.operatorOrInplace(address, vmDt, operand)
+                "|" -> return expressionEval.operatorOrInplace(knownAddress, null, vmDt, operand)
-            "&" -> return expressionEval.operatorAndInplace(address, vmDt, operand)
+                "&" -> return expressionEval.operatorAndInplace(knownAddress, null, vmDt, operand)
-            "^" -> return expressionEval.operatorXorInplace(address, vmDt, operand)
+                "^" -> return expressionEval.operatorXorInplace(knownAddress, null, vmDt, operand)
-            "<<" -> return expressionEval.operatorShiftLeftInplace(address, vmDt, operand)
+                "<<" -> return expressionEval.operatorShiftLeftInplace(knownAddress, null, vmDt, operand)
-            ">>" -> return expressionEval.operatorShiftRightInplace(address, vmDt, signed, operand)
+                ">>" -> return expressionEval.operatorShiftRightInplace(knownAddress, null, vmDt, signed, operand)
                 else -> {}
             }
+        } else {
+            symbol!!
+            when (operator) {
+                "+" -> return expressionEval.operatorPlusInplace(null, symbol, vmDt, operand)
+                "-" -> return expressionEval.operatorMinusInplace(null, symbol, vmDt, operand)
+                "*" -> return expressionEval.operatorMultiplyInplace(null, symbol, vmDt, operand)
+                "/" -> return expressionEval.operatorDivideInplace(null, symbol, vmDt, signed, operand)
+                "|" -> return expressionEval.operatorOrInplace(null, symbol, vmDt, operand)
+                "&" -> return expressionEval.operatorAndInplace(null, symbol, vmDt, operand)
+                "^" -> return expressionEval.operatorXorInplace(null, symbol, vmDt, operand)
+                "<<" -> return expressionEval.operatorShiftLeftInplace(null, symbol, vmDt, operand)
+                ">>" -> return expressionEval.operatorShiftRightInplace(null, symbol, vmDt, signed, operand)
+                else -> {}
+            }
+        }
         return fallbackAssign(origAssign)
     }
 
-    private fun inplacePrefix(operator: String, vmDt: VmDataType, address: Int): VmCodeChunk {
+    private fun inplacePrefix(operator: String, vmDt: VmDataType, knownAddress: Int?, addressSymbol: String?, position: Position): IRCodeChunk {
-        val code= VmCodeChunk()
+        val code= IRCodeChunk(position)
         when(operator) {
             "+" -> { }
             "-" -> {
-                code += VmCodeInstruction(Opcode.NEGM, vmDt, value = address)
+                code += if(knownAddress!=null)
+                    IRCodeInstruction(Opcode.NEGM, vmDt, value = knownAddress)
+                else
+                    IRCodeInstruction(Opcode.NEGM, vmDt, labelSymbol = addressSymbol)
             }
             "~" -> {
                 val regMask = codeGen.vmRegisters.nextFree()
                 val mask = if(vmDt==VmDataType.BYTE) 0x00ff else 0xffff
-                code += VmCodeInstruction(Opcode.LOAD, vmDt, reg1=regMask, value = mask)
+                code += IRCodeInstruction(Opcode.LOAD, vmDt, reg1=regMask, value = mask)
-                code += VmCodeInstruction(Opcode.XORM, vmDt, reg1=regMask, value = address)
+                code += if(knownAddress!=null)
-            }
+                    IRCodeInstruction(Opcode.XORM, vmDt, reg1=regMask, value = knownAddress)
-            "not" -> {
+                else
-                code += VmCodeInstruction(Opcode.NOTM, vmDt, value = address)
+                    IRCodeInstruction(Opcode.XORM, vmDt, reg1=regMask, labelSymbol = addressSymbol)
             }
             else -> throw AssemblyError("weird prefix operator")
         }
         return code
     }
 
-    private fun translateRegularAssign(assignment: PtAssignment): VmCodeChunk {
+    private fun translateRegularAssign(assignment: PtAssignment): IRCodeChunk {
         // note: assigning array and string values is done via an explicit memcopy/stringcopy function call.
         val ident = assignment.target.identifier
         val memory = assignment.target.memory
         val array = assignment.target.array
         val vmDt = codeGen.vmType(assignment.value.type)
 
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(assignment.position)
         var resultRegister = -1
         var resultFpRegister = -1
         val zero = codeGen.isZero(assignment.value)
@@ -145,19 +190,18 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
             }
         }
         if(ident!=null) {
-            val address = codeGen.allocations.get(ident.targetName)
+            val symbol = ident.targetName.joinToString(".")
             code += if(zero) {
-                VmCodeInstruction(Opcode.STOREZM, vmDt, value = address)
+                IRCodeInstruction(Opcode.STOREZM, vmDt, labelSymbol = symbol)
             } else {
                 if (vmDt == VmDataType.FLOAT)
-                    VmCodeInstruction(Opcode.STOREM, vmDt, fpReg1 = resultFpRegister, value = address)
+                    IRCodeInstruction(Opcode.STOREM, vmDt, fpReg1 = resultFpRegister, labelSymbol = symbol)
                 else
-                    VmCodeInstruction(Opcode.STOREM, vmDt, reg1 = resultRegister, value = address)
+                    IRCodeInstruction(Opcode.STOREM, vmDt, reg1 = resultRegister, labelSymbol = symbol)
             }
         }
         else if(array!=null) {
-            val variable = array.variable.targetName
+            val variable = array.variable.targetName.joinToString(".")
-            var variableAddr = codeGen.allocations.get(variable)
             val itemsize = codeGen.program.memsizer.memorySize(array.type)
 
             if(array.variable.type==DataType.UWORD) {
@@ -168,38 +212,43 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
                     throw AssemblyError("non-array var indexing requires bytes index")
                 val idxReg = codeGen.vmRegisters.nextFree()
                 code += expressionEval.translateExpression(array.index, idxReg, -1)
-                code += VmCodeInstruction(Opcode.STOREIX, vmDt, reg1=resultRegister, reg2=idxReg, value = variableAddr)
+                if(zero) {
+                    // there's no STOREZIX instruction
+                    resultRegister = codeGen.vmRegisters.nextFree()
+                    code += IRCodeInstruction(Opcode.LOAD, vmDt, reg1=resultRegister, value=0)
+                }
+                code += IRCodeInstruction(Opcode.STOREIX, vmDt, reg1=resultRegister, reg2=idxReg, labelSymbol = variable)
                 return code
             }
 
             val fixedIndex = constIntValue(array.index)
             if(zero) {
                 if(fixedIndex!=null) {
-                    variableAddr += fixedIndex*itemsize
+                    val offset = fixedIndex*itemsize
-                    code += VmCodeInstruction(Opcode.STOREZM, vmDt, value=variableAddr)
+                    code += IRCodeInstruction(Opcode.STOREZM, vmDt, labelSymbol = "$variable+$offset")
                 } else {
                     val indexReg = codeGen.vmRegisters.nextFree()
-                    code += loadIndexReg(array, itemsize, indexReg)
+                    code += loadIndexReg(array, itemsize, indexReg, array.position)
-                    code += VmCodeInstruction(Opcode.STOREZX, vmDt, reg1=indexReg, value=variableAddr)
+                    code += IRCodeInstruction(Opcode.STOREZX, vmDt, reg1=indexReg, labelSymbol = variable)
                 }
             } else {
                 if(vmDt== VmDataType.FLOAT) {
                     if(fixedIndex!=null) {
-                        variableAddr += fixedIndex*itemsize
+                        val offset = fixedIndex*itemsize
-                        code += VmCodeInstruction(Opcode.STOREM, vmDt, fpReg1 = resultFpRegister, value=variableAddr)
+                        code += IRCodeInstruction(Opcode.STOREM, vmDt, fpReg1 = resultFpRegister, labelSymbol = "$variable+$offset")
                     } else {
                         val indexReg = codeGen.vmRegisters.nextFree()
-                        code += loadIndexReg(array, itemsize, indexReg)
+                        code += loadIndexReg(array, itemsize, indexReg, array.position)
-                        code += VmCodeInstruction(Opcode.STOREX, vmDt, reg1 = resultRegister, reg2=indexReg, value=variableAddr)
+                        code += IRCodeInstruction(Opcode.STOREX, vmDt, reg1 = resultRegister, reg2=indexReg, labelSymbol = variable)
                     }
                 } else {
                     if(fixedIndex!=null) {
-                        variableAddr += fixedIndex*itemsize
+                        val offset = fixedIndex*itemsize
-                        code += VmCodeInstruction(Opcode.STOREM, vmDt, reg1 = resultRegister, value=variableAddr)
+                        code += IRCodeInstruction(Opcode.STOREM, vmDt, reg1 = resultRegister, labelSymbol = "$variable+$offset")
                     } else {
                         val indexReg = codeGen.vmRegisters.nextFree()
-                        code += loadIndexReg(array, itemsize, indexReg)
+                        code += loadIndexReg(array, itemsize, indexReg, array.position)
-                        code += VmCodeInstruction(Opcode.STOREX, vmDt, reg1 = resultRegister, reg2=indexReg, value=variableAddr)
+                        code += IRCodeInstruction(Opcode.STOREX, vmDt, reg1 = resultRegister, reg2=indexReg, labelSymbol = variable)
                     }
                 }
             }
@@ -208,19 +257,19 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
             require(vmDt== VmDataType.BYTE)
             if(zero) {
                 if(memory.address is PtNumber) {
-                    code += VmCodeInstruction(Opcode.STOREZM, vmDt, value=(memory.address as PtNumber).number.toInt())
+                    code += IRCodeInstruction(Opcode.STOREZM, vmDt, value=(memory.address as PtNumber).number.toInt())
                 } else {
                     val addressReg = codeGen.vmRegisters.nextFree()
                     code += expressionEval.translateExpression(memory.address, addressReg, -1)
-                    code += VmCodeInstruction(Opcode.STOREZI, vmDt, reg1=addressReg)
+                    code += IRCodeInstruction(Opcode.STOREZI, vmDt, reg1=addressReg)
                 }
             } else {
                 if(memory.address is PtNumber) {
-                    code += VmCodeInstruction(Opcode.STOREM, vmDt, reg1=resultRegister, value=(memory.address as PtNumber).number.toInt())
+                    code += IRCodeInstruction(Opcode.STOREM, vmDt, reg1=resultRegister, value=(memory.address as PtNumber).number.toInt())
                 } else {
                     val addressReg = codeGen.vmRegisters.nextFree()
                     code += expressionEval.translateExpression(memory.address, addressReg, -1)
-                    code += VmCodeInstruction(Opcode.STOREI, vmDt, reg1=resultRegister, reg2=addressReg)
+                    code += IRCodeInstruction(Opcode.STOREI, vmDt, reg1=resultRegister, reg2=addressReg)
                 }
             }
         }
@@ -229,8 +278,8 @@ internal class AssignmentGen(private val codeGen: CodeGen, private val expressio
         return code
     }
 
-    private fun loadIndexReg(array: PtArrayIndexer, itemsize: Int, indexReg: Int): VmCodeChunk {
+    private fun loadIndexReg(array: PtArrayIndexer, itemsize: Int, indexReg: Int, position: Position): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(position)
         if(itemsize==1) {
             code += expressionEval.translateExpression(array.index, indexReg, -1)
         }

codeGenIntermediate/src/prog8/codegen/intermediate/BuiltinFuncGen.kt

@@ -1,16 +1,17 @@
-package prog8.codegen.virtual
+package prog8.codegen.intermediate
 
 import prog8.code.StStaticVariable
 import prog8.code.ast.*
 import prog8.code.core.AssemblyError
 import prog8.code.core.DataType
-import prog8.vm.Opcode
+import prog8.code.core.Position
+import prog8.intermediate.*
 import prog8.vm.Syscall
-import prog8.vm.VmDataType
 
-internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen: ExpressionGen) {
 
-    fun translate(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+internal class BuiltinFuncGen(private val codeGen: IRCodeGen, private val exprGen: ExpressionGen) {
+
+    fun translate(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
         return when(call.name) {
             "any" -> funcAny(call, resultRegister)
             "all" -> funcAll(call, resultRegister)
@@ -25,20 +26,19 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
             "rsave",
             "rsavex",
             "rrestore",
-            "rrestorex" -> VmCodeChunk() // vm doesn't have registers to save/restore
+            "rrestorex" -> IRCodeChunk(call.position) // vm doesn't have registers to save/restore
-            "rnd" -> funcRnd(resultRegister)
+            "rnd" -> funcRnd(resultRegister, call.position)
-            "rndw" -> funcRndw(resultRegister)
+            "rndw" -> funcRndw(resultRegister, call.position)
             "callfar" -> throw AssemblyError("callfar() is for cx16 target only")
             "callrom" -> throw AssemblyError("callrom() is for cx16 target only")
             "msb" -> funcMsb(call, resultRegister)
             "lsb" -> funcLsb(call, resultRegister)
-            "boolean" -> funcBoolean(call, resultRegister)
             "memory" -> funcMemory(call, resultRegister)
             "peek" -> funcPeek(call, resultRegister)
             "peekw" -> funcPeekW(call, resultRegister)
             "poke" -> funcPoke(call)
             "pokew" -> funcPokeW(call)
-            "pokemon" -> VmCodeChunk()
+            "pokemon" -> IRCodeChunk(call.position)
             "mkword" -> funcMkword(call, resultRegister)
             "sort" -> funcSort(call)
             "reverse" -> funcReverse(call)
@@ -46,24 +46,24 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
             "ror" -> funcRolRor(Opcode.ROXR, call, resultRegister)
             "rol2" -> funcRolRor(Opcode.ROL, call, resultRegister)
             "ror2" -> funcRolRor(Opcode.ROR, call, resultRegister)
-            else -> TODO("builtinfunc ${call.name}")
+            else -> throw AssemblyError("missing builtinfunc for ${call.name}")
         }
     }
 
-    private fun funcCmp(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcCmp(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val leftRegister = codeGen.vmRegisters.nextFree()
         val rightRegister = codeGen.vmRegisters.nextFree()
         code += exprGen.translateExpression(call.args[0], leftRegister, -1)
         code += exprGen.translateExpression(call.args[1], rightRegister, -1)
-        code += VmCodeInstruction(Opcode.CMP, codeGen.vmType(call.args[0].type), reg1=leftRegister, reg2=rightRegister)
+        code += IRCodeInstruction(Opcode.CMP, codeGen.vmType(call.args[0].type), reg1=leftRegister, reg2=rightRegister)
         return code
     }
 
-    private fun funcAny(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcAny(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
         val arrayName = call.args[0] as PtIdentifier
         val array = codeGen.symbolTable.flat.getValue(arrayName.targetName) as StStaticVariable
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val syscall =
             when (array.dt) {
                 DataType.ARRAY_UB,
@@ -74,14 +74,14 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
                 else -> throw IllegalArgumentException("weird type")
             }
         code += exprGen.translateExpression(call.args[0], 0, -1)
-        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1 = 1, value = array.length)
+        code += IRCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1 = 1, value = array.length)
-        code += VmCodeInstruction(Opcode.SYSCALL, value = syscall.ordinal)
+        code += IRCodeInstruction(Opcode.SYSCALL, value = syscall.ordinal)
         if (resultRegister != 0)
-            code += VmCodeInstruction(Opcode.LOADR, VmDataType.BYTE, reg1 = resultRegister, reg2 = 0)
+            code += IRCodeInstruction(Opcode.LOADR, VmDataType.BYTE, reg1 = resultRegister, reg2 = 0)
         return code
     }
 
-    private fun funcAll(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcAll(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
         val arrayName = call.args[0] as PtIdentifier
         val array = codeGen.symbolTable.flat.getValue(arrayName.targetName) as StStaticVariable
         val syscall =
@@ -93,42 +93,42 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
                 DataType.ARRAY_F -> Syscall.ALL_FLOAT
                 else -> throw IllegalArgumentException("weird type")
             }
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args[0], 0, -1)
-        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
+        code += IRCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
-        code += VmCodeInstruction(Opcode.SYSCALL, value=syscall.ordinal)
+        code += IRCodeInstruction(Opcode.SYSCALL, value=syscall.ordinal)
         if(resultRegister!=0)
-            code += VmCodeInstruction(Opcode.LOADR, VmDataType.BYTE, reg1=resultRegister, reg2=0)
+            code += IRCodeInstruction(Opcode.LOADR, VmDataType.BYTE, reg1=resultRegister, reg2=0)
         return code
     }
 
-    private fun funcAbs(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcAbs(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val sourceDt = call.args.single().type
         if(sourceDt!=DataType.UWORD) {
             code += exprGen.translateExpression(call.args[0], resultRegister, -1)
             when (sourceDt) {
                 DataType.UBYTE -> {
-                    code += VmCodeInstruction(Opcode.EXT, VmDataType.BYTE, reg1=resultRegister)
+                    code += IRCodeInstruction(Opcode.EXT, VmDataType.BYTE, reg1=resultRegister)
                 }
                 DataType.BYTE -> {
-                    val andReg = codeGen.vmRegisters.nextFree()
                     val notNegativeLabel = codeGen.createLabelName()
-                    code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=andReg, value=0x80)
+                    val compareReg = codeGen.vmRegisters.nextFree()
-                    code += VmCodeInstruction(Opcode.AND, VmDataType.BYTE, reg1=andReg, reg2=resultRegister)
+                    code += IRCodeInstruction(Opcode.LOADR, VmDataType.BYTE, reg1=compareReg, reg2=resultRegister)
-                    code += VmCodeInstruction(Opcode.BZ, VmDataType.BYTE, reg1=andReg, labelSymbol = notNegativeLabel)
+                    code += IRCodeInstruction(Opcode.AND, VmDataType.BYTE, reg1=compareReg, value=0x80)
-                    code += VmCodeInstruction(Opcode.NEG, VmDataType.BYTE, reg1=resultRegister)
+                    code += IRCodeInstruction(Opcode.BZ, VmDataType.BYTE, reg1=compareReg, labelSymbol = notNegativeLabel)
-                    code += VmCodeInstruction(Opcode.EXT, VmDataType.BYTE, reg1=resultRegister)
+                    code += IRCodeInstruction(Opcode.NEG, VmDataType.BYTE, reg1=resultRegister)
-                    code += VmCodeLabel(notNegativeLabel)
+                    code += IRCodeInstruction(Opcode.EXT, VmDataType.BYTE, reg1=resultRegister)
+                    code += IRCodeLabel(notNegativeLabel)
                 }
                 DataType.WORD -> {
-                    val andReg = codeGen.vmRegisters.nextFree()
                     val notNegativeLabel = codeGen.createLabelName()
-                    code += VmCodeInstruction(Opcode.LOAD, VmDataType.WORD, reg1=andReg, value=0x8000)
+                    val compareReg = codeGen.vmRegisters.nextFree()
-                    code += VmCodeInstruction(Opcode.AND, VmDataType.WORD, reg1=andReg, reg2=resultRegister)
+                    code += IRCodeInstruction(Opcode.LOADR, VmDataType.WORD, reg1=compareReg, reg2=resultRegister)
-                    code += VmCodeInstruction(Opcode.BZ, VmDataType.WORD, reg1=andReg, labelSymbol = notNegativeLabel)
+                    code += IRCodeInstruction(Opcode.AND, VmDataType.WORD, reg1=compareReg, value=0x8000)
-                    code += VmCodeInstruction(Opcode.NEG, VmDataType.WORD, reg1=resultRegister)
+                    code += IRCodeInstruction(Opcode.BZ, VmDataType.WORD, reg1=compareReg, labelSymbol = notNegativeLabel)
-                    code += VmCodeLabel(notNegativeLabel)
+                    code += IRCodeInstruction(Opcode.NEG, VmDataType.WORD, reg1=resultRegister)
+                    code += IRCodeLabel(notNegativeLabel)
                 }
                 else -> throw AssemblyError("weird type")
             }
@@ -136,55 +136,55 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
         return code
     }
 
-    private fun funcSgn(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcSgn(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
         code += exprGen.translateExpression(call.args.single(), reg, -1)
-        code += VmCodeInstruction(Opcode.SGN, codeGen.vmType(call.type), reg1=resultRegister, reg2=reg)
+        code += IRCodeInstruction(Opcode.SGN, codeGen.vmType(call.type), reg1=resultRegister, reg2=reg)
         return code
     }
 
-    private fun funcSqrt16(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcSqrt16(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
         code += exprGen.translateExpression(call.args.single(), reg, -1)
-        code += VmCodeInstruction(Opcode.SQRT, VmDataType.WORD, reg1=resultRegister, reg2=reg)
+        code += IRCodeInstruction(Opcode.SQRT, VmDataType.WORD, reg1=resultRegister, reg2=reg)
         return code
     }
 
-    private fun funcPop(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPop(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
-        code += VmCodeInstruction(Opcode.POP, VmDataType.BYTE, reg1=reg)
+        code += IRCodeInstruction(Opcode.POP, VmDataType.BYTE, reg1=reg)
         code += assignRegisterTo(call.args.single(), reg)
         return code
     }
 
-    private fun funcPopw(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPopw(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
-        code += VmCodeInstruction(Opcode.POP, VmDataType.WORD, reg1=reg)
+        code += IRCodeInstruction(Opcode.POP, VmDataType.WORD, reg1=reg)
         code += assignRegisterTo(call.args.single(), reg)
         return code
     }
 
-    private fun funcPush(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPush(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
         code += exprGen.translateExpression(call.args.single(), reg, -1)
-        code += VmCodeInstruction(Opcode.PUSH, VmDataType.BYTE, reg1=reg)
+        code += IRCodeInstruction(Opcode.PUSH, VmDataType.BYTE, reg1=reg)
         return code
     }
 
-    private fun funcPushw(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPushw(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         val reg = codeGen.vmRegisters.nextFree()
         code += exprGen.translateExpression(call.args.single(), reg, -1)
-        code += VmCodeInstruction(Opcode.PUSH, VmDataType.WORD, reg1=reg)
+        code += IRCodeInstruction(Opcode.PUSH, VmDataType.WORD, reg1=reg)
         return code
     }
 
-    private fun funcReverse(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcReverse(call: PtBuiltinFunctionCall): IRCodeChunk {
         val arrayName = call.args[0] as PtIdentifier
         val array = codeGen.symbolTable.flat.getValue(arrayName.targetName) as StStaticVariable
         val sortSyscall =
@@ -194,14 +194,14 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
                 DataType.ARRAY_F -> Syscall.REVERSE_FLOATS
                 else -> throw IllegalArgumentException("weird type to reverse")
             }
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args[0], 0, -1)
-        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
+        code += IRCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
-        code += VmCodeInstruction(Opcode.SYSCALL, value=sortSyscall.ordinal)
+        code += IRCodeInstruction(Opcode.SYSCALL, value=sortSyscall.ordinal)
         return code
     }
 
-    private fun funcSort(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcSort(call: PtBuiltinFunctionCall): IRCodeChunk {
         val arrayName = call.args[0] as PtIdentifier
         val array = codeGen.symbolTable.flat.getValue(arrayName.targetName) as StStaticVariable
         val sortSyscall =
@@ -211,185 +211,153 @@ internal class BuiltinFuncGen(private val codeGen: CodeGen, private val exprGen:
                 DataType.ARRAY_UW -> Syscall.SORT_UWORD
                 DataType.ARRAY_W -> Syscall.SORT_WORD
                 DataType.STR -> Syscall.SORT_UBYTE
-                DataType.ARRAY_F -> throw java.lang.IllegalArgumentException("sorting a floating point array is not supported")
+                DataType.ARRAY_F -> throw IllegalArgumentException("sorting a floating point array is not supported")
                 else -> throw IllegalArgumentException("weird type to sort")
             }
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args[0], 0, -1)
-        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
+        code += IRCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=1, value=array.length)
-        code += VmCodeInstruction(Opcode.SYSCALL, value=sortSyscall.ordinal)
+        code += IRCodeInstruction(Opcode.SYSCALL, value=sortSyscall.ordinal)
         return code
     }
 
-    private fun funcMkword(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcMkword(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
         val msbReg = codeGen.vmRegisters.nextFree()
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args[0], msbReg, -1)
         code += exprGen.translateExpression(call.args[1], resultRegister, -1)
-        code += VmCodeInstruction(Opcode.CONCAT, VmDataType.BYTE, reg1=resultRegister, reg2=msbReg)
+        code += IRCodeInstruction(Opcode.CONCAT, VmDataType.BYTE, reg1=resultRegister, reg2=msbReg)
         return code
     }
 
-    private fun funcPokeW(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPokeW(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         if(codeGen.isZero(call.args[1])) {
             if (call.args[0] is PtNumber) {
                 val address = (call.args[0] as PtNumber).number.toInt()
-                code += VmCodeInstruction(Opcode.STOREZM, VmDataType.WORD, value = address)
+                code += IRCodeInstruction(Opcode.STOREZM, VmDataType.WORD, value = address)
             } else {
                 val addressReg = codeGen.vmRegisters.nextFree()
                 code += exprGen.translateExpression(call.args[0], addressReg, -1)
-                code += VmCodeInstruction(Opcode.STOREZI, VmDataType.WORD, reg2 = addressReg)
+                code += IRCodeInstruction(Opcode.STOREZI, VmDataType.WORD, reg2 = addressReg)
             }
         } else {
             val valueReg = codeGen.vmRegisters.nextFree()
             if (call.args[0] is PtNumber) {
                 val address = (call.args[0] as PtNumber).number.toInt()
                 code += exprGen.translateExpression(call.args[1], valueReg, -1)
-                code += VmCodeInstruction(Opcode.STOREM, VmDataType.WORD, reg1 = valueReg, value = address)
+                code += IRCodeInstruction(Opcode.STOREM, VmDataType.WORD, reg1 = valueReg, value = address)
             } else {
                 val addressReg = codeGen.vmRegisters.nextFree()
                 code += exprGen.translateExpression(call.args[0], addressReg, -1)
                 code += exprGen.translateExpression(call.args[1], valueReg, -1)
-                code += VmCodeInstruction(Opcode.STOREI, VmDataType.WORD, reg1 = valueReg, reg2 = addressReg)
+                code += IRCodeInstruction(Opcode.STOREI, VmDataType.WORD, reg1 = valueReg, reg2 = addressReg)
             }
         }
         return code
     }
 
-    private fun funcPoke(call: PtBuiltinFunctionCall): VmCodeChunk {
+    private fun funcPoke(call: PtBuiltinFunctionCall): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         if(codeGen.isZero(call.args[1])) {
             if (call.args[0] is PtNumber) {
                 val address = (call.args[0] as PtNumber).number.toInt()
-                code += VmCodeInstruction(Opcode.STOREZM, VmDataType.BYTE, value = address)
+                code += IRCodeInstruction(Opcode.STOREZM, VmDataType.BYTE, value = address)
             } else {
                 val addressReg = codeGen.vmRegisters.nextFree()
                 code += exprGen.translateExpression(call.args[0], addressReg, -1)
-                code += VmCodeInstruction(Opcode.STOREZI, VmDataType.BYTE, reg2 = addressReg)
+                code += IRCodeInstruction(Opcode.STOREZI, VmDataType.BYTE, reg2 = addressReg)
             }
         } else {
             val valueReg = codeGen.vmRegisters.nextFree()
             if (call.args[0] is PtNumber) {
                 val address = (call.args[0] as PtNumber).number.toInt()
                 code += exprGen.translateExpression(call.args[1], valueReg, -1)
-                code += VmCodeInstruction(Opcode.STOREM, VmDataType.BYTE, reg1 = valueReg, value = address)
+                code += IRCodeInstruction(Opcode.STOREM, VmDataType.BYTE, reg1 = valueReg, value = address)
             } else {
                 val addressReg = codeGen.vmRegisters.nextFree()
                 code += exprGen.translateExpression(call.args[0], addressReg, -1)
                 code += exprGen.translateExpression(call.args[1], valueReg, -1)
-                code += VmCodeInstruction(Opcode.STOREI, VmDataType.BYTE, reg1 = valueReg, reg2 = addressReg)
+                code += IRCodeInstruction(Opcode.STOREI, VmDataType.BYTE, reg1 = valueReg, reg2 = addressReg)
             }
         }
         return code
     }
 
-    private fun funcPeekW(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcPeekW(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         if(call.args[0] is PtNumber) {
             val address = (call.args[0] as PtNumber).number.toInt()
-            code += VmCodeInstruction(Opcode.LOADM, VmDataType.WORD, reg1 = resultRegister, value = address)
+            code += IRCodeInstruction(Opcode.LOADM, VmDataType.WORD, reg1 = resultRegister, value = address)
         } else {
             val addressReg = codeGen.vmRegisters.nextFree()
             code += exprGen.translateExpression(call.args.single(), addressReg, -1)
-            code += VmCodeInstruction(Opcode.LOADI, VmDataType.WORD, reg1 = resultRegister, reg2 = addressReg)
+            code += IRCodeInstruction(Opcode.LOADI, VmDataType.WORD, reg1 = resultRegister, reg2 = addressReg)
         }
         return code
     }
 
-    private fun funcPeek(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcPeek(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         if(call.args[0] is PtNumber) {
             val address = (call.args[0] as PtNumber).number.toInt()
-            code += VmCodeInstruction(Opcode.LOADM, VmDataType.BYTE, reg1 = resultRegister, value = address)
+            code += IRCodeInstruction(Opcode.LOADM, VmDataType.BYTE, reg1 = resultRegister, value = address)
         } else {
             val addressReg = codeGen.vmRegisters.nextFree()
             code += exprGen.translateExpression(call.args.single(), addressReg, -1)
-            code += VmCodeInstruction(Opcode.LOADI, VmDataType.BYTE, reg1 = resultRegister, reg2 = addressReg)
+            code += IRCodeInstruction(Opcode.LOADI, VmDataType.BYTE, reg1 = resultRegister, reg2 = addressReg)
         }
         return code
     }
 
-    private fun funcRnd(resultRegister: Int): VmCodeChunk {
+    private fun funcRnd(resultRegister: Int, position: Position): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(position)
-        code += VmCodeInstruction(Opcode.RND, VmDataType.BYTE, reg1=resultRegister)
+        code += IRCodeInstruction(Opcode.RND, VmDataType.BYTE, reg1=resultRegister)
         return code
     }
 
-    private fun funcRndw(resultRegister: Int): VmCodeChunk {
+    private fun funcRndw(resultRegister: Int, position: Position): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(position)
-        code += VmCodeInstruction(Opcode.RND, VmDataType.WORD, reg1=resultRegister)
+        code += IRCodeInstruction(Opcode.RND, VmDataType.WORD, reg1=resultRegister)
         return code
     }
 
-    private fun funcMemory(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcMemory(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
         val name = (call.args[0] as PtString).value
         val size = (call.args[1] as PtNumber).number.toUInt()
         val align = (call.args[2] as PtNumber).number.toUInt()
-        val existing = codeGen.allocations.getMemorySlab(name)
+        val label = codeGen.addMemorySlab(name, size, align, call.position)
-        val address = if(existing==null)
+        val code = IRCodeChunk(call.position)
-            codeGen.allocations.allocateMemorySlab(name, size, align)
+        code += IRCodeInstruction(Opcode.LOAD, VmDataType.WORD, reg1=resultRegister, labelSymbol = label)
-        else if(existing.second!=size || existing.third!=align) {
-            codeGen.errors.err("memory slab '$name' already exists with a different size or alignment", call.position)
-            return VmCodeChunk()
-        }
-        else
-            existing.first
-        val code = VmCodeChunk()
-        code += VmCodeInstruction(Opcode.LOAD, VmDataType.WORD, reg1=resultRegister, value=address.toInt())
         return code
     }
 
-    private fun funcLsb(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcLsb(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args.single(), resultRegister, -1)
         // note: if a word result is needed, the upper byte is cleared by the typecast that follows. No need to do it here.
         return code
     }
 
-    private fun funcMsb(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcMsb(call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(call.position)
         code += exprGen.translateExpression(call.args.single(), resultRegister, -1)
-        code += VmCodeInstruction(Opcode.MSIG, VmDataType.BYTE, reg1 = resultRegister, reg2=resultRegister)
+        code += IRCodeInstruction(Opcode.MSIG, VmDataType.BYTE, reg1 = resultRegister, reg2=resultRegister)
         // note: if a word result is needed, the upper byte is cleared by the typecast that follows. No need to do it here.
         return code
     }
 
-    private fun funcBoolean(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
+    private fun funcRolRor(opcode: Opcode, call: PtBuiltinFunctionCall, resultRegister: Int): IRCodeChunk {
-        val code = VmCodeChunk()
         val vmDt = codeGen.vmType(call.args[0].type)
-        when (vmDt) {
+        val code = IRCodeChunk(call.position)
-            VmDataType.FLOAT -> {
-                val fpValueReg = codeGen.vmRegisters.nextFreeFloat()
-                val fpSignReg = codeGen.vmRegisters.nextFreeFloat()
-                code += exprGen.translateExpression(call.args.single(), -1, fpValueReg)
-                code += VmCodeInstruction(Opcode.SGN, VmDataType.FLOAT, fpReg1 = fpSignReg, fpReg2 = fpValueReg)
-                code += VmCodeInstruction(Opcode.FTOSB, VmDataType.FLOAT, reg1 = resultRegister, fpReg1 = fpSignReg)
-            }
-            VmDataType.WORD -> {
-                val msbReg = codeGen.vmRegisters.nextFree()
-                code += exprGen.translateExpression(call.args.single(), resultRegister, -1)
-                code += VmCodeInstruction(Opcode.MSIG, VmDataType.BYTE, reg1 = msbReg, reg2=resultRegister)
-                code += VmCodeInstruction(Opcode.OR, VmDataType.BYTE, reg1=resultRegister, reg2=msbReg)
-            }
-            else -> {
-                code += exprGen.translateExpression(call.args.single(), resultRegister, -1)
-            }
-        }
-        return code
-    }
-
-    private fun funcRolRor(opcode: Opcode, call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk {
-        val vmDt = codeGen.vmType(call.args[0].type)
-        val code = VmCodeChunk()
         code += exprGen.translateExpression(call.args[0], resultRegister, -1)
-        code += VmCodeInstruction(opcode, vmDt, reg1=resultRegister)
+        code += IRCodeInstruction(opcode, vmDt, reg1=resultRegister)
         code += assignRegisterTo(call.args[0], resultRegister)
         return code
     }
 
-    private fun assignRegisterTo(target: PtExpression, register: Int): VmCodeChunk {
+    private fun assignRegisterTo(target: PtExpression, register: Int): IRCodeChunk {
-        val code = VmCodeChunk()
+        val code = IRCodeChunk(target.position)
         val assignment = PtAssignment(target.position)
         val assignTarget = PtAssignTarget(target.position)
         assignTarget.children.add(target)

codeGenIntermediate/src/prog8/codegen/intermediate/IRPeepholeOptimizer.kt

@@ -0,0 +1,180 @@
+package prog8.codegen.intermediate
+
+import prog8.intermediate.*
+
+internal class IRPeepholeOptimizer(private val irprog: IRProgram) {
+    fun optimize() {
+        irprog.blocks.asSequence().flatMap { it.subroutines }.forEach { sub ->
+            sub.chunks.forEach { chunk ->
+                // we don't optimize Inline Asm chunks here.
+                if(chunk is IRCodeChunk) {
+                    do {
+                        val indexedInstructions = chunk.lines.withIndex()
+                            .filter { it.value is IRCodeInstruction }
+                            .map { IndexedValue(it.index, (it.value as IRCodeInstruction).ins) }
+                        val changed = removeNops(chunk, indexedInstructions)
+                                || removeDoubleLoadsAndStores(chunk, indexedInstructions)       // TODO not yet implemented
+                                || removeUselessArithmetic(chunk, indexedInstructions)
+                                || removeWeirdBranches(chunk, indexedInstructions)
+                                || removeDoubleSecClc(chunk, indexedInstructions)
+                                || cleanupPushPop(chunk, indexedInstructions)
+                        // TODO other optimizations:
+                        //  more complex optimizations such as unused registers
+                    } while (changed)
+                }
+            }
+        }
+    }
+
+    private fun cleanupPushPop(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        //  push followed by pop to same target, or different target->replace with load
+        var changed = false
+        indexedInstructions.reversed().forEach { (idx, ins) ->
+            if(ins.opcode== Opcode.PUSH) {
+                if(idx < chunk.lines.size-1) {
+                    val insAfter = chunk.lines[idx+1] as? IRCodeInstruction
+                    if(insAfter!=null && insAfter.ins.opcode == Opcode.POP) {
+                        if(ins.reg1==insAfter.ins.reg1) {
+                            chunk.lines.removeAt(idx)
+                            chunk.lines.removeAt(idx)
+                        } else {
+                            chunk.lines[idx] = IRCodeInstruction(Opcode.LOADR, ins.type, reg1=insAfter.ins.reg1, reg2=ins.reg1)
+                            chunk.lines.removeAt(idx+1)
+                        }
+                        changed = true
+                    }
+                }
+            }
+        }
+        return changed
+    }
+
+    private fun removeDoubleSecClc(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        //  double sec, clc
+        //  sec+clc or clc+sec
+        var changed = false
+        indexedInstructions.reversed().forEach { (idx, ins) ->
+            if(ins.opcode== Opcode.SEC || ins.opcode== Opcode.CLC) {
+                if(idx < chunk.lines.size-1) {
+                    val insAfter = chunk.lines[idx+1] as? IRCodeInstruction
+                    if(insAfter?.ins?.opcode == ins.opcode) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                    else if(ins.opcode== Opcode.SEC && insAfter?.ins?.opcode== Opcode.CLC) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                    else if(ins.opcode== Opcode.CLC && insAfter?.ins?.opcode== Opcode.SEC) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+            }
+        }
+        return changed
+    }
+
+    private fun removeWeirdBranches(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        //  jump/branch to label immediately below
+        var changed = false
+        indexedInstructions.reversed().forEach { (idx, ins) ->
+            val labelSymbol = ins.labelSymbol
+            if(ins.opcode== Opcode.JUMP && labelSymbol!=null) {
+                // if jumping to label immediately following this
+                if(idx < chunk.lines.size-1) {
+                    val label = chunk.lines[idx+1] as? IRCodeLabel
+                    if(labelSymbol.size==1 && label?.name == labelSymbol[0]) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+            }
+        }
+        return changed
+    }
+
+    private fun removeUselessArithmetic(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        // note: this is hard to solve for the non-immediate instructions atm because the values are loaded into registers first
+        var changed = false
+        indexedInstructions.reversed().forEach { (idx, ins) ->
+            when (ins.opcode) {
+                Opcode.DIV, Opcode.DIVS, Opcode.MUL, Opcode.MOD -> {
+                    if (ins.value == 1) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+                Opcode.ADD, Opcode.SUB -> {
+                    if (ins.value == 1) {
+                        chunk.lines[idx] = IRCodeInstruction(
+                            if (ins.opcode == Opcode.ADD) Opcode.INC else Opcode.DEC,
+                            ins.type,
+                            ins.reg1
+                        )
+                        changed = true
+                    } else if (ins.value == 0) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+                Opcode.AND -> {
+                    if (ins.value == 0) {
+                        chunk.lines[idx] = IRCodeInstruction(Opcode.LOAD, ins.type, reg1 = ins.reg1, value = 0)
+                        changed = true
+                    } else if (ins.value == 255 && ins.type == VmDataType.BYTE) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    } else if (ins.value == 65535 && ins.type == VmDataType.WORD) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+                Opcode.OR -> {
+                    if (ins.value == 0) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    } else if ((ins.value == 255 && ins.type == VmDataType.BYTE) || (ins.value == 65535 && ins.type == VmDataType.WORD)) {
+                        chunk.lines[idx] = IRCodeInstruction(Opcode.LOAD, ins.type, reg1 = ins.reg1, value = ins.value)
+                        changed = true
+                    }
+                }
+                Opcode.XOR -> {
+                    if (ins.value == 0) {
+                        chunk.lines.removeAt(idx)
+                        changed = true
+                    }
+                }
+                else -> {}
+            }
+        }
+        return changed
+    }
+
+    private fun removeNops(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        var changed = false
+        indexedInstructions.reversed().forEach { (idx, ins) ->
+            if (ins.opcode == Opcode.NOP) {
+                changed = true
+                chunk.lines.removeAt(idx)
+            }
+        }
+        return changed
+    }
+
+    private fun removeDoubleLoadsAndStores(chunk: IRCodeChunk, indexedInstructions: List<IndexedValue<Instruction>>): Boolean {
+        var changed = false
+        indexedInstructions.forEach { (idx, ins) ->
+
+            // TODO: detect multiple loads to the same target registers, only keep first (if source is not I/O memory)
+            // TODO: detect multiple stores to the same target, only keep first (if target is not I/O memory)
+            // TODO: detect multiple float ffrom/fto to the same target, only keep first
+            // TODO: detect multiple sequential rnd with same reg1, only keep one
+            // TODO: detect subsequent same xors/nots/negs, remove the pairs completely as they cancel out
+            // TODO: detect multiple same ands, ors; only keep first
+            // TODO: (hard) detect multiple registers being assigned the same value (and not changed) - use only 1 of them
+            // ...
+        }
+        return changed
+    }
+}

codeGenIntermediate/src/prog8/codegen/intermediate/RegisterPool.kt

@@ -0,0 +1,27 @@
+package prog8.codegen.intermediate
+
+import prog8.code.core.AssemblyError
+
+internal class RegisterPool {
+    private var firstFree: Int=3        // integer registers 0,1,2 are reserved
+    private var firstFreeFloat: Int=0
+
+    fun peekNext() = firstFree
+    fun peekNextFloat() = firstFreeFloat
+
+    fun nextFree(): Int {
+        val result = firstFree
+        firstFree++
+        if(firstFree>65535)
+            throw AssemblyError("out of virtual registers (int)")
+        return result
+    }
+
+    fun nextFreeFloat(): Int {
+        val result = firstFreeFloat
+        firstFreeFloat++
+        if(firstFreeFloat>65535)
+            throw AssemblyError("out of virtual registers (fp)")
+        return result
+    }
+}

codeGenIntermediate/test/Dummies.kt

@@ -0,0 +1,20 @@
+import prog8.code.core.DataType
+import prog8.code.core.Encoding
+import prog8.code.core.IMemSizer
+import prog8.code.core.IStringEncoding
+
+
+internal object DummyMemsizer : IMemSizer {
+    override fun memorySize(dt: DataType) = 0
+    override fun memorySize(arrayDt: DataType, numElements: Int) = 0
+}
+
+internal object DummyStringEncoder : IStringEncoding {
+    override fun encodeString(str: String, encoding: Encoding): List<UByte> {
+        return emptyList()
+    }
+
+    override fun decodeString(bytes: List<UByte>, encoding: Encoding): String {
+        return ""
+    }
+}

codeGenIntermediate/test/TestIRPeepholeOpt.kt

@@ -0,0 +1,179 @@
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import prog8.code.SymbolTable
+import prog8.code.core.*
+import prog8.code.target.VMTarget
+import prog8.codegen.intermediate.IRPeepholeOptimizer
+import prog8.intermediate.*
+
+class TestIRPeepholeOpt: FunSpec({
+    fun makeIRProgram(lines: List<IRCodeLine>): IRProgram {
+        val block = IRBlock("main", null, IRBlock.BlockAlignment.NONE, Position.DUMMY)
+        val sub = IRSubroutine("main.start", emptyList(), null, Position.DUMMY)
+        val chunk = IRCodeChunk(Position.DUMMY)
+        for(line in lines)
+            chunk += line
+        sub += chunk
+        block += sub
+        val st = SymbolTable()
+        val target = VMTarget()
+        val options = CompilationOptions(
+            OutputType.RAW,
+            CbmPrgLauncherType.NONE,
+            ZeropageType.DONTUSE,
+            emptyList(),
+            floats = false,
+            noSysInit = true,
+            compTarget = target,
+            loadAddress = target.machine.PROGRAM_LOAD_ADDRESS
+        )
+        val prog = IRProgram("test", st, options, target)
+        prog.addBlock(block)
+        return prog
+    }
+
+    fun IRProgram.lines(): List<IRCodeLine> = this.blocks.flatMap { it.subroutines }.flatMap { it.chunks }.flatMap { it.lines }
+
+    test("remove nops") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.JUMP, labelSymbol = "dummy"),
+            IRCodeInstruction(Opcode.NOP),
+            IRCodeInstruction(Opcode.NOP)
+        ))
+        irProg.lines().size shouldBe 3
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        irProg.lines().size shouldBe 1
+    }
+
+    test("remove jmp to label below") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.JUMP, labelSymbol = "label"),  // removed
+            IRCodeLabel("label"),
+            IRCodeInstruction(Opcode.JUMP, labelSymbol = "label2"), // removed
+            IRCodeInstruction(Opcode.NOP),  // removed
+            IRCodeLabel("label2"),
+            IRCodeInstruction(Opcode.JUMP, labelSymbol = "label3"),
+            IRCodeInstruction(Opcode.INC, VmDataType.BYTE, reg1=1),
+            IRCodeLabel("label3")
+        ))
+        irProg.lines().size shouldBe 8
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 5
+        (lines[0] as IRCodeLabel).name shouldBe "label"
+        (lines[1] as IRCodeLabel).name shouldBe "label2"
+        (lines[2] as IRCodeInstruction).ins.opcode shouldBe Opcode.JUMP
+        (lines[3] as IRCodeInstruction).ins.opcode shouldBe Opcode.INC
+        (lines[4] as IRCodeLabel).name shouldBe "label3"
+    }
+
+    test("remove double sec/clc") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.SEC),
+            IRCodeInstruction(Opcode.SEC),
+            IRCodeInstruction(Opcode.SEC),
+            IRCodeInstruction(Opcode.CLC),
+            IRCodeInstruction(Opcode.CLC),
+            IRCodeInstruction(Opcode.CLC)
+        ))
+        irProg.lines().size shouldBe 6
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 1
+        (lines[0] as IRCodeInstruction).ins.opcode shouldBe Opcode.CLC
+    }
+
+    test("push followed by pop") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.PUSH, VmDataType.BYTE, reg1=42),
+            IRCodeInstruction(Opcode.POP, VmDataType.BYTE, reg1=42),
+            IRCodeInstruction(Opcode.PUSH, VmDataType.BYTE, reg1=99),
+            IRCodeInstruction(Opcode.POP, VmDataType.BYTE, reg1=222)
+        ))
+        irProg.lines().size shouldBe 4
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 1
+        (lines[0] as IRCodeInstruction).ins.opcode shouldBe Opcode.LOADR
+        (lines[0] as IRCodeInstruction).ins.reg1 shouldBe 222
+        (lines[0] as IRCodeInstruction).ins.reg2 shouldBe 99
+    }
+
+    test("remove useless div/mul, add/sub") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.DIV, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.DIVS, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.MUL, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.MOD, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.DIV, VmDataType.BYTE, reg1=42, value = 2),
+            IRCodeInstruction(Opcode.DIVS, VmDataType.BYTE, reg1=42, value = 2),
+            IRCodeInstruction(Opcode.MUL, VmDataType.BYTE, reg1=42, value = 2),
+            IRCodeInstruction(Opcode.MOD, VmDataType.BYTE, reg1=42, value = 2),
+            IRCodeInstruction(Opcode.ADD, VmDataType.BYTE, reg1=42, value = 0),
+            IRCodeInstruction(Opcode.SUB, VmDataType.BYTE, reg1=42, value = 0)
+        ))
+        irProg.lines().size shouldBe 10
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 4
+    }
+
+    test("replace add/sub 1 by inc/dec") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.ADD, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.SUB, VmDataType.BYTE, reg1=42, value = 1)
+        ))
+        irProg.lines().size shouldBe 2
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 2
+        (lines[0] as IRCodeInstruction).ins.opcode shouldBe Opcode.INC
+        (lines[1] as IRCodeInstruction).ins.opcode shouldBe Opcode.DEC
+    }
+
+    test("remove useless and/or/xor") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.AND, VmDataType.BYTE, reg1=42, value = 255),
+            IRCodeInstruction(Opcode.AND, VmDataType.WORD, reg1=42, value = 65535),
+            IRCodeInstruction(Opcode.OR, VmDataType.BYTE, reg1=42, value = 0),
+            IRCodeInstruction(Opcode.XOR, VmDataType.BYTE, reg1=42, value = 0),
+            IRCodeInstruction(Opcode.AND, VmDataType.BYTE, reg1=42, value = 200),
+            IRCodeInstruction(Opcode.AND, VmDataType.WORD, reg1=42, value = 60000),
+            IRCodeInstruction(Opcode.OR, VmDataType.BYTE, reg1=42, value = 1),
+            IRCodeInstruction(Opcode.XOR, VmDataType.BYTE, reg1=42, value = 1)
+        ))
+        irProg.lines().size shouldBe 8
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 4
+    }
+
+    test("replace and/or/xor by constant number") {
+        val irProg = makeIRProgram(listOf(
+            IRCodeInstruction(Opcode.AND, VmDataType.BYTE, reg1=42, value = 0),
+            IRCodeInstruction(Opcode.AND, VmDataType.WORD, reg1=42, value = 0),
+            IRCodeInstruction(Opcode.OR, VmDataType.BYTE, reg1=42, value = 255),
+            IRCodeInstruction(Opcode.OR, VmDataType.WORD, reg1=42, value = 65535)
+        ))
+        irProg.lines().size shouldBe 4
+        val opt = IRPeepholeOptimizer(irProg)
+        opt.optimize()
+        val lines = irProg.lines()
+        lines.size shouldBe 4
+        (lines[0] as IRCodeInstruction).ins.opcode shouldBe Opcode.LOAD
+        (lines[1] as IRCodeInstruction).ins.opcode shouldBe Opcode.LOAD
+        (lines[2] as IRCodeInstruction).ins.opcode shouldBe Opcode.LOAD
+        (lines[3] as IRCodeInstruction).ins.opcode shouldBe Opcode.LOAD
+        (lines[0] as IRCodeInstruction).ins.value shouldBe 0
+        (lines[1] as IRCodeInstruction).ins.value shouldBe 0
+        (lines[2] as IRCodeInstruction).ins.value shouldBe 255
+        (lines[3] as IRCodeInstruction).ins.value shouldBe 65535
+    }
+})

codeGenVirtual/build.gradle

@@ -3,6 +3,7 @@ plugins {
     id 'java'
     id 'application'
     id "org.jetbrains.kotlin.jvm"
+    id "io.kotest" version "0.3.9"
 }
 
 java {
@@ -24,13 +25,14 @@ compileTestKotlin {
 }
 
 dependencies {
-    implementation project(':virtualmachine')
-    implementation project(':codeAst')
     implementation project(':codeCore')
+    implementation project(':intermediate')
+    implementation project(':codeGenIntermediate')
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     // implementation "org.jetbrains.kotlin:kotlin-reflect"
     implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.16"
 
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:5.3.2'
 }
 
 sourceSets {
@@ -42,6 +44,22 @@ sourceSets {
             srcDirs = ["${project.projectDir}/res"]
         }
     }
+    test {
+        java {
+            srcDir "${project.projectDir}/test"
+        }
+    }
 }
 
-// note: there are no unit tests in this module!
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "skipped", "failed"
+    }
+}

codeGenVirtual/codeGenVirtual.iml

@@ -4,13 +4,17 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
     <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
-    <orderEntry type="module" module-name="codeAst" />
+    <orderEntry type="library" name="io.kotest.assertions.core.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
     <orderEntry type="module" module-name="codeCore" />
-    <orderEntry type="module" module-name="virtualmachine" />
+    <orderEntry type="module" module-name="intermediate" />
+    <orderEntry type="module" module-name="codeGenIntermediate" />
   </component>
 </module>

codeGenVirtual/src/prog8/codegen/virtual/AssemblyProgram.kt

@@ -1,138 +0,0 @@
-package prog8.codegen.virtual
-
-import prog8.code.core.AssemblyError
-import prog8.code.core.CompilationOptions
-import prog8.code.core.IAssemblyProgram
-import prog8.vm.Instruction
-import prog8.vm.Opcode
-import prog8.vm.OpcodesWithAddress
-import prog8.vm.VmDataType
-import java.io.BufferedWriter
-import java.nio.file.Path
-import kotlin.io.path.bufferedWriter
-import kotlin.io.path.div
-
-
-internal class AssemblyProgram(override val name: String,
-                               private val allocations: VariableAllocator
-) : IAssemblyProgram {
-
-    private val globalInits = mutableListOf<VmCodeLine>()
-    private val blocks = mutableListOf<VmCodeChunk>()
-
-    override fun assemble(options: CompilationOptions): Boolean {
-        val outfile = options.outputDir / ("$name.p8virt")
-        println("write code to $outfile")
-        outfile.bufferedWriter().use { out ->
-            allocations.asVmMemory().forEach { (name, alloc) ->
-                out.write("; ${name.joinToString(".")}\n")
-                out.write(alloc + "\n")
-            }
-            out.write("------PROGRAM------\n")
-
-            if(!options.dontReinitGlobals) {
-                out.write("; global var inits\n")
-                globalInits.forEach { out.writeLine(it) }
-            }
-
-            out.write("; actual program code\n")
-            blocks.asSequence().flatMap { it.lines }.forEach { line->out.writeLine(line) }
-        }
-        return true
-    }
-
-    private fun BufferedWriter.writeLine(line: VmCodeLine) {
-        when(line) {
-            is VmCodeComment -> write("; ${line.comment}\n")
-            is VmCodeInstruction -> {
-                write(line.ins.toString() + "\n")
-            }
-            is VmCodeLabel -> write("_" + line.name.joinToString(".") + ":\n")
-            is VmCodeInlineAsm -> {
-                val asm = line.assembly.replace("""\{[a-zA-Z\d_\.]+\}""".toRegex()) { matchResult ->
-                    val name = matchResult.value.substring(1, matchResult.value.length-1).split('.')
-                    allocations.get(name).toString() }
-                write(asm+"\n")
-            }
-            is VmCodeInlineBinary -> {
-                write("incbin \"${line.file}\"")
-                if(line.offset!=null)
-                    write(",${line.offset}")
-                if(line.length!=null)
-                    write(",${line.length}")
-                write("\n")
-            }
-            else -> throw AssemblyError("invalid vm code line")
-        }
-    }
-
-    fun addGlobalInits(chunk: VmCodeChunk) = globalInits.addAll(chunk.lines)
-    fun addBlock(block: VmCodeChunk) = blocks.add(block)
-}
-
-internal sealed class VmCodeLine
-
-internal class VmCodeInstruction(
-    opcode: Opcode,
-    type: VmDataType?=null,
-    reg1: Int?=null,        // 0-$ffff
-    reg2: Int?=null,        // 0-$ffff
-    fpReg1: Int?=null,      // 0-$ffff
-    fpReg2: Int?=null,      // 0-$ffff
-    value: Int?=null,       // 0-$ffff
-    fpValue: Float?=null,
-    labelSymbol: List<String>?=null    // alternative to value for branch/call/jump labels
-): VmCodeLine() {
-    val ins = Instruction(opcode, type, reg1, reg2, fpReg1, fpReg2, value, fpValue, labelSymbol)
-
-    init {
-        if(reg1!=null && (reg1<0 || reg1>65536))
-            throw IllegalArgumentException("reg1 out of bounds")
-        if(reg2!=null && (reg2<0 || reg2>65536))
-            throw IllegalArgumentException("reg2 out of bounds")
-        if(fpReg1!=null && (fpReg1<0 || fpReg1>65536))
-            throw IllegalArgumentException("fpReg1 out of bounds")
-        if(fpReg2!=null && (fpReg2<0 || fpReg2>65536))
-            throw IllegalArgumentException("fpReg2 out of bounds")
-
-        if(value!=null && opcode !in OpcodesWithAddress) {
-            when (type) {
-                VmDataType.BYTE -> {
-                    if (value < -128 || value > 255)
-                        throw IllegalArgumentException("value out of range for byte: $value")
-                }
-                VmDataType.WORD -> {
-                    if (value < -32768 || value > 65535)
-                        throw IllegalArgumentException("value out of range for word: $value")
-                }
-                VmDataType.FLOAT, null -> {}
-            }
-        }
-    }
-}
-
-internal class VmCodeLabel(val name: List<String>): VmCodeLine()
-internal class VmCodeComment(val comment: String): VmCodeLine()
-
-internal class VmCodeChunk(initial: VmCodeLine? = null) {
-    val lines = mutableListOf<VmCodeLine>()
-
-    init {
-        if(initial!=null)
-            lines.add(initial)
-    }
-
-    operator fun plusAssign(line: VmCodeLine) {
-        lines.add(line)
-    }
-
-    operator fun plusAssign(chunk: VmCodeChunk) {
-        lines.addAll(chunk.lines)
-    }
-}
-
-internal class VmCodeInlineAsm(asm: String): VmCodeLine() {
-    val assembly: String = asm.trimIndent()
-}
-
-internal class VmCodeInlineBinary(val file: Path, val offset: UInt?, val length: UInt?): VmCodeLine()

codeGenVirtual/src/prog8/codegen/virtual/CodeGen.kt

@@ -1,831 +0,0 @@
-package prog8.codegen.virtual
-
-import prog8.code.StStaticVariable
-import prog8.code.SymbolTable
-import prog8.code.ast.*
-import prog8.code.core.*
-import prog8.vm.Opcode
-import prog8.vm.VmDataType
-import kotlin.math.pow
-
-
-internal class VmRegisterPool {
-    private var firstFree: Int=3        // integer registers 0,1,2 are reserved
-    private var firstFreeFloat: Int=0
-
-    fun peekNext() = firstFree
-    fun peekNextFloat() = firstFreeFloat
-
-    fun nextFree(): Int {
-        val result = firstFree
-        firstFree++
-        if(firstFree>65535)
-            throw AssemblyError("out of virtual registers (int)")
-        return result
-    }
-
-    fun nextFreeFloat(): Int {
-        val result = firstFreeFloat
-        firstFreeFloat++
-        if(firstFreeFloat>65535)
-            throw AssemblyError("out of virtual registers (fp)")
-        return result
-    }
-}
-
-
-class CodeGen(internal val program: PtProgram,
-              internal val symbolTable: SymbolTable,
-              internal val options: CompilationOptions,
-              internal val errors: IErrorReporter
-): IAssemblyGenerator {
-
-    internal val allocations = VariableAllocator(symbolTable, program, errors)
-    private val expressionEval = ExpressionGen(this)
-    private val builtinFuncGen = BuiltinFuncGen(this, expressionEval)
-    private val assignmentGen = AssignmentGen(this, expressionEval)
-    internal val vmRegisters = VmRegisterPool()
-
-    override fun compileToAssembly(): IAssemblyProgram? {
-        val vmprog = AssemblyProgram(program.name, allocations)
-
-        if(!options.dontReinitGlobals) {
-            // collect global variables initializers
-            program.allBlocks().forEach {
-                val code = VmCodeChunk()
-                it.children.filterIsInstance<PtAssignment>().forEach { assign -> code += assignmentGen.translate(assign) }
-                vmprog.addGlobalInits(code)
-            }
-        }
-
-        for (block in program.allBlocks()) {
-            vmprog.addBlock(translate(block))
-        }
-
-        println("Vm codegen: amount of vm registers=${vmRegisters.peekNext()}")
-
-        return vmprog
-    }
-
-
-    internal fun translateNode(node: PtNode): VmCodeChunk {
-        val code = when(node) {
-            is PtBlock -> translate(node)
-            is PtSub -> translate(node)
-            is PtScopeVarsDecls -> VmCodeChunk() // vars should be looked up via symbol table
-            is PtVariable -> VmCodeChunk() // var should be looked up via symbol table
-            is PtMemMapped -> VmCodeChunk() // memmapped var should be looked up via symbol table
-            is PtConstant -> VmCodeChunk() // constants have all been folded into the code
-            is PtAssignment -> assignmentGen.translate(node)
-            is PtNodeGroup -> translateGroup(node.children)
-            is PtBuiltinFunctionCall -> translateBuiltinFunc(node, 0)
-            is PtFunctionCall -> expressionEval.translate(node, 0, 0)
-            is PtNop -> VmCodeChunk()
-            is PtReturn -> translate(node)
-            is PtJump -> translate(node)
-            is PtWhen -> translate(node)
-            is PtForLoop -> translate(node)
-            is PtIfElse -> translate(node)
-            is PtPostIncrDecr -> translate(node)
-            is PtRepeatLoop -> translate(node)
-            is PtLabel -> VmCodeChunk(VmCodeLabel(node.scopedName))
-            is PtBreakpoint -> VmCodeChunk(VmCodeInstruction(Opcode.BREAKPOINT))
-            is PtConditionalBranch -> translate(node)
-            is PtInlineAssembly -> VmCodeChunk(VmCodeInlineAsm(node.assembly))
-            is PtIncludeBinary -> VmCodeChunk(VmCodeInlineBinary(node.file, node.offset, node.length))
-            is PtAsmSub -> TODO("asmsub not yet supported on virtual machine target ${node.position}")
-            is PtAddressOf,
-            is PtContainmentCheck,
-            is PtMemoryByte,
-            is PtProgram,
-            is PtArrayIndexer,
-            is PtBinaryExpression,
-            is PtIdentifier,
-            is PtWhenChoice,
-            is PtPrefix,
-            is PtRange,
-            is PtAssignTarget,
-            is PtTypeCast,
-            is PtSubroutineParameter,
-            is PtNumber,
-            is PtArray,
-            is PtString -> throw AssemblyError("should not occur as separate statement node ${node.position}")
-            else -> TODO("missing codegen for $node")
-        }
-        if(code.lines.isNotEmpty() && node.position.line!=0)
-            code.lines.add(0, VmCodeComment(node.position.toString()))
-        return code
-    }
-
-    private fun translate(branch: PtConditionalBranch): VmCodeChunk {
-        val code = VmCodeChunk()
-        val elseLabel = createLabelName()
-        // note that the branch opcode used is the opposite as the branch condition, because the generated code jumps to the 'else' part
-        code += when(branch.condition) {
-            BranchCondition.CS -> VmCodeInstruction(Opcode.BSTCC, labelSymbol = elseLabel)
-            BranchCondition.CC -> VmCodeInstruction(Opcode.BSTCS, labelSymbol = elseLabel)
-            BranchCondition.EQ, BranchCondition.Z -> VmCodeInstruction(Opcode.BSTNE, labelSymbol = elseLabel)
-            BranchCondition.NE, BranchCondition.NZ -> VmCodeInstruction(Opcode.BSTEQ, labelSymbol = elseLabel)
-            BranchCondition.MI, BranchCondition.NEG -> VmCodeInstruction(Opcode.BSTPOS, labelSymbol = elseLabel)
-            BranchCondition.PL, BranchCondition.POS -> VmCodeInstruction(Opcode.BSTNEG, labelSymbol = elseLabel)
-            BranchCondition.VC,
-            BranchCondition.VS -> throw AssemblyError("conditional branch ${branch.condition} not supported in vm target due to lack of cpu V flag ${branch.position}")
-        }
-        code += translateNode(branch.trueScope)
-        if(branch.falseScope.children.isNotEmpty()) {
-            val endLabel = createLabelName()
-            code += VmCodeInstruction(Opcode.JUMP, labelSymbol = endLabel)
-            code += VmCodeLabel(elseLabel)
-            code += translateNode(branch.falseScope)
-            code += VmCodeLabel(endLabel)
-        } else {
-            code += VmCodeLabel(elseLabel)
-        }
-        return code
-    }
-
-    private fun translate(whenStmt: PtWhen): VmCodeChunk {
-        if(whenStmt.choices.children.isEmpty())
-            return VmCodeChunk()
-        val code = VmCodeChunk()
-        val valueReg = vmRegisters.nextFree()
-        val choiceReg = vmRegisters.nextFree()
-        val valueDt = vmType(whenStmt.value.type)
-        code += expressionEval.translateExpression(whenStmt.value, valueReg, -1)
-        val choices = whenStmt.choices.children.map {it as PtWhenChoice }
-        val endLabel = createLabelName()
-        for (choice in choices) {
-            if(choice.isElse) {
-                code += translateNode(choice.statements)
-            } else {
-                val skipLabel = createLabelName()
-                val values = choice.values.children.map {it as PtNumber}
-                if(values.size==1) {
-                    code += VmCodeInstruction(Opcode.LOAD, valueDt, reg1=choiceReg, value=values[0].number.toInt())
-                    code += VmCodeInstruction(Opcode.BNE, valueDt, reg1=valueReg, reg2=choiceReg, labelSymbol = skipLabel)
-                    code += translateNode(choice.statements)
-                    if(choice.statements.children.last() !is PtReturn)
-                        code += VmCodeInstruction(Opcode.JUMP, labelSymbol = endLabel)
-                } else {
-                    val matchLabel = createLabelName()
-                    for (value in values) {
-                        code += VmCodeInstruction(Opcode.LOAD, valueDt, reg1=choiceReg, value=value.number.toInt())
-                        code += VmCodeInstruction(Opcode.BEQ, valueDt, reg1=valueReg, reg2=choiceReg, labelSymbol = matchLabel)
-                    }
-                    code += VmCodeInstruction(Opcode.JUMP, labelSymbol = skipLabel)
-                    code += VmCodeLabel(matchLabel)
-                    code += translateNode(choice.statements)
-                    if(choice.statements.children.last() !is PtReturn)
-                        code += VmCodeInstruction(Opcode.JUMP, labelSymbol = endLabel)
-                }
-                code += VmCodeLabel(skipLabel)
-            }
-        }
-        code += VmCodeLabel(endLabel)
-        return code
-    }
-
-    private fun translate(forLoop: PtForLoop): VmCodeChunk {
-        val loopvar = symbolTable.lookup(forLoop.variable.targetName) as StStaticVariable
-        val iterable = forLoop.iterable
-        val code = VmCodeChunk()
-        when(iterable) {
-            is PtRange -> {
-                if(iterable.from is PtNumber && iterable.to is PtNumber)
-                    code += translateForInConstantRange(forLoop, loopvar)
-                else
-                    code += translateForInNonConstantRange(forLoop, loopvar)
-            }
-            is PtIdentifier -> {
-                val arrayAddress = allocations.get(iterable.targetName)
-                val iterableVar = symbolTable.lookup(iterable.targetName) as StStaticVariable
-                val loopvarAddress = allocations.get(loopvar.scopedName)
-                val indexReg = vmRegisters.nextFree()
-                val tmpReg = vmRegisters.nextFree()
-                val loopLabel = createLabelName()
-                val endLabel = createLabelName()
-                if(iterableVar.dt==DataType.STR) {
-                    // iterate over a zero-terminated string
-                    code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=indexReg, value=0)
-                    code += VmCodeLabel(loopLabel)
-                    code += VmCodeInstruction(Opcode.LOADX, VmDataType.BYTE, reg1=tmpReg, reg2=indexReg, value = arrayAddress)
-                    code += VmCodeInstruction(Opcode.BZ, VmDataType.BYTE, reg1=tmpReg, labelSymbol = endLabel)
-                    code += VmCodeInstruction(Opcode.STOREM, VmDataType.BYTE, reg1=tmpReg, value = loopvarAddress)
-                    code += translateNode(forLoop.statements)
-                    code += VmCodeInstruction(Opcode.INC, VmDataType.BYTE, reg1=indexReg)
-                    code += VmCodeInstruction(Opcode.JUMP, labelSymbol = loopLabel)
-                    code += VmCodeLabel(endLabel)
-                } else {
-                    // iterate over array
-                    val elementDt = ArrayToElementTypes.getValue(iterable.type)
-                    val elementSize = program.memsizer.memorySize(elementDt)
-                    val lengthBytes = iterableVar.length!! * elementSize
-                    if(lengthBytes<256) {
-                        val lengthReg = vmRegisters.nextFree()
-                        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=indexReg, value=0)
-                        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=lengthReg, value=lengthBytes)
-                        code += VmCodeLabel(loopLabel)
-                        code += VmCodeInstruction(Opcode.LOADX, vmType(elementDt), reg1=tmpReg, reg2=indexReg, value=arrayAddress)
-                        code += VmCodeInstruction(Opcode.STOREM, vmType(elementDt), reg1=tmpReg, value = loopvarAddress)
-                        code += translateNode(forLoop.statements)
-                        code += addConstReg(VmDataType.BYTE, indexReg, elementSize)
-                        code += VmCodeInstruction(Opcode.BNE, VmDataType.BYTE, reg1=indexReg, reg2=lengthReg, labelSymbol = loopLabel)
-                    } else if(lengthBytes==256) {
-                        code += VmCodeInstruction(Opcode.LOAD, VmDataType.BYTE, reg1=indexReg, value=0)
-                        code += VmCodeLabel(loopLabel)
-                        code += VmCodeInstruction(Opcode.LOADX, vmType(elementDt), reg1=tmpReg, reg2=indexReg, value=arrayAddress)
-                        code += VmCodeInstruction(Opcode.STOREM, vmType(elementDt), reg1=tmpReg, value = loopvarAddress)
-                        code += translateNode(forLoop.statements)
-                        code += addConstReg(VmDataType.BYTE, indexReg, elementSize)
-                        code += VmCodeInstruction(Opcode.BNZ, VmDataType.BYTE, reg1=indexReg, labelSymbol = loopLabel)
-                    } else {
-                        throw AssemblyError("iterator length should never exceed 256")
-                    }
-                }
-            }
-            else -> throw AssemblyError("weird for iterable")
-        }
-        return code
-    }
-
-    private fun translateForInNonConstantRange(forLoop: PtForLoop, loopvar: StStaticVariable): VmCodeChunk {
-        val iterable = forLoop.iterable as PtRange
-        val step = iterable.step.number.toInt()
-        if (step==0)
-            throw AssemblyError("step 0")
-        val indexReg = vmRegisters.nextFree()
-        val endvalueReg = vmRegisters.nextFree()
-        val loopvarAddress = allocations.get(loopvar.scopedName)
-        val loopvarDt = vmType(loopvar.dt)
-        val loopLabel = createLabelName()
-        val code = VmCodeChunk()
-
-        code += expressionEval.translateExpression(iterable.to, endvalueReg, -1)
-        code += expressionEval.translateExpression(iterable.from, indexReg, -1)
-        code += VmCodeInstruction(Opcode.STOREM, loopvarDt, reg1=indexReg, value=loopvarAddress)
-        code += VmCodeLabel(loopLabel)
-        code += translateNode(forLoop.statements)
-        if(step<3) {
-            code += addConstMem(loopvarDt, loopvarAddress.toUInt(), step)
-            code += VmCodeInstruction(Opcode.LOADM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-        } else {
-            code += VmCodeInstruction(Opcode.LOADM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-            code += addConstReg(loopvarDt, indexReg, step)
-            code += VmCodeInstruction(Opcode.STOREM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-        }
-        val branchOpcode = if(loopvar.dt in SignedDatatypes) Opcode.BLES else Opcode.BLE
-        code += VmCodeInstruction(branchOpcode, loopvarDt, reg1=indexReg, reg2=endvalueReg, labelSymbol=loopLabel)
-        return code
-    }
-
-    private fun translateForInConstantRange(forLoop: PtForLoop, loopvar: StStaticVariable): VmCodeChunk {
-        val loopLabel = createLabelName()
-        val loopvarAddress = allocations.get(loopvar.scopedName)
-        val indexReg = vmRegisters.nextFree()
-        val loopvarDt = vmType(loopvar.dt)
-        val iterable = forLoop.iterable as PtRange
-        val step = iterable.step.number.toInt()
-        val rangeStart = (iterable.from as PtNumber).number.toInt()
-        val rangeEndUntyped = (iterable.to as PtNumber).number.toInt() + step
-        if(step==0)
-            throw AssemblyError("step 0")
-        if(step>0 && rangeEndUntyped<rangeStart || step<0 && rangeEndUntyped>rangeStart)
-            throw AssemblyError("empty range")
-        val rangeEndWrapped = if(loopvarDt==VmDataType.BYTE) rangeEndUntyped and 255 else rangeEndUntyped and 65535
-        val code = VmCodeChunk()
-        val endvalueReg: Int
-        if(rangeEndWrapped!=0) {
-            endvalueReg = vmRegisters.nextFree()
-            code += VmCodeInstruction(Opcode.LOAD, loopvarDt, reg1 = endvalueReg, value = rangeEndWrapped)
-        } else {
-            endvalueReg = -1 // not used
-        }
-        code += VmCodeInstruction(Opcode.LOAD, loopvarDt, reg1=indexReg, value=rangeStart)
-        code += VmCodeInstruction(Opcode.STOREM, loopvarDt, reg1=indexReg, value=loopvarAddress)
-        code += VmCodeLabel(loopLabel)
-        code += translateNode(forLoop.statements)
-        if(step<3) {
-            code += addConstMem(loopvarDt, loopvarAddress.toUInt(), step)
-            code += VmCodeInstruction(Opcode.LOADM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-        } else {
-            code += VmCodeInstruction(Opcode.LOADM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-            code += addConstReg(loopvarDt, indexReg, step)
-            code += VmCodeInstruction(Opcode.STOREM, loopvarDt, reg1 = indexReg, value = loopvarAddress)
-        }
-        code += if(rangeEndWrapped==0) {
-            VmCodeInstruction(Opcode.BNZ, loopvarDt, reg1 = indexReg, labelSymbol = loopLabel)
-        } else {
-            VmCodeInstruction(Opcode.BNE, loopvarDt, reg1 = indexReg, reg2 = endvalueReg, labelSymbol = loopLabel)
-        }
-        return code
-    }
-
-    private fun addConstReg(dt: VmDataType, reg: Int, value: Int): VmCodeChunk {
-        val code = VmCodeChunk()
-        when(value) {
-            0 -> { /* do nothing */ }
-            1 -> {
-                code += VmCodeInstruction(Opcode.INC, dt, reg1=reg)
-            }
-            2 -> {
-                code += VmCodeInstruction(Opcode.INC, dt, reg1=reg)
-                code += VmCodeInstruction(Opcode.INC, dt, reg1=reg)
-            }
-            -1 -> {
-                code += VmCodeInstruction(Opcode.DEC, dt, reg1=reg)
-            }
-            -2 -> {
-                code += VmCodeInstruction(Opcode.DEC, dt, reg1=reg)
-                code += VmCodeInstruction(Opcode.DEC, dt, reg1=reg)
-            }
-            else -> {
-                val valueReg = vmRegisters.nextFree()
-                if(value>0) {
-                    code += VmCodeInstruction(Opcode.LOAD, dt, reg1=valueReg, value= value)
-                    code += VmCodeInstruction(Opcode.ADD, dt, reg1 = reg, reg2 = valueReg)
-                }
-                else {
-                    code += VmCodeInstruction(Opcode.LOAD, dt, reg1=valueReg, value= -value)
-                    code += VmCodeInstruction(Opcode.SUB, dt, reg1 = reg, reg2 = valueReg)
-                }
-            }
-        }
-        return code
-    }
-
-    private fun addConstMem(dt: VmDataType, address: UInt, value: Int): VmCodeChunk {
-        val code = VmCodeChunk()
-        when(value) {
-            0 -> { /* do nothing */ }
-            1 -> {
-                code += VmCodeInstruction(Opcode.INCM, dt, value=address.toInt())
-            }
-            2 -> {
-                code += VmCodeInstruction(Opcode.INCM, dt, value=address.toInt())
-                code += VmCodeInstruction(Opcode.INCM, dt, value=address.toInt())
-            }
-            -1 -> {
-                code += VmCodeInstruction(Opcode.DECM, dt, value=address.toInt())
-            }
-            -2 -> {
-                code += VmCodeInstruction(Opcode.DECM, dt, value=address.toInt())
-                code += VmCodeInstruction(Opcode.DECM, dt, value=address.toInt())
-            }
-            else -> {
-                val valueReg = vmRegisters.nextFree()
-                val operandReg = vmRegisters.nextFree()
-                if(value>0) {
-                    code += VmCodeInstruction(Opcode.LOADM, dt, reg1=valueReg, value=address.toInt())
-                    code += VmCodeInstruction(Opcode.LOAD, dt, reg1=operandReg, value=value)
-                    code += VmCodeInstruction(Opcode.ADD, dt, reg1 = valueReg, reg2 = operandReg)
-                    code += VmCodeInstruction(Opcode.STOREM, dt, reg1=valueReg, value=address.toInt())
-                }
-                else {
-                    code += VmCodeInstruction(Opcode.LOADM, dt, reg1=valueReg, value=address.toInt())
-                    code += VmCodeInstruction(Opcode.LOAD, dt, reg1=operandReg, value=-value)
-                    code += VmCodeInstruction(Opcode.SUB, dt, reg1 = valueReg, reg2 = operandReg)
-                    code += VmCodeInstruction(Opcode.STOREM, dt, reg1=valueReg, value=address.toInt())
-                }
-            }
-        }
-        return code
-    }
-
-    internal fun multiplyByConstFloat(fpReg: Int, factor: Float): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1f)
-            return code
-        if(factor==0f) {
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1 = fpReg, fpValue = 0f)
-        } else {
-            val factorReg = vmRegisters.nextFreeFloat()
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1=factorReg, fpValue = factor)
-            code += VmCodeInstruction(Opcode.MUL, VmDataType.FLOAT, fpReg1 = fpReg, fpReg2 = factorReg)
-        }
-        return code
-    }
-
-    internal fun multiplyByConstFloatInplace(address: Int, factor: Float): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1f)
-            return code
-        if(factor==0f) {
-            code += VmCodeInstruction(Opcode.STOREZM, VmDataType.FLOAT, value = address)
-        } else {
-            val factorReg = vmRegisters.nextFreeFloat()
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1=factorReg, fpValue = factor)
-            code += VmCodeInstruction(Opcode.MULM, VmDataType.FLOAT, fpReg1 = factorReg, value = address)
-        }
-        return code
-    }
-
-    internal val powersOfTwo = (0..16).map { 2.0.pow(it.toDouble()).toInt() }
-
-    internal fun multiplyByConst(dt: VmDataType, reg: Int, factor: Int): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1)
-            return code
-        val pow2 = powersOfTwo.indexOf(factor)
-        if(pow2==1) {
-            // just shift 1 bit
-            code += VmCodeInstruction(Opcode.LSL, dt, reg1=reg)
-        }
-        else if(pow2>=1) {
-            // just shift multiple bits
-            val pow2reg = vmRegisters.nextFree()
-            code += VmCodeInstruction(Opcode.LOAD, dt, reg1=pow2reg, value=pow2)
-            code += VmCodeInstruction(Opcode.LSLN, dt, reg1=reg, reg2=pow2reg)
-        } else {
-            if (factor == 0) {
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=reg, value=0)
-            }
-            else {
-                val factorReg = vmRegisters.nextFree()
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=factorReg, value= factor)
-                code += VmCodeInstruction(Opcode.MUL, dt, reg1=reg, reg2=factorReg)
-            }
-        }
-        return code
-    }
-
-    internal fun multiplyByConstInplace(dt: VmDataType, address: Int, factor: Int): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1)
-            return code
-        val pow2 = powersOfTwo.indexOf(factor)
-        if(pow2==1) {
-            // just shift 1 bit
-            code += VmCodeInstruction(Opcode.LSLM, dt, value = address)
-        }
-        else if(pow2>=1) {
-            // just shift multiple bits
-            val pow2reg = vmRegisters.nextFree()
-            code += VmCodeInstruction(Opcode.LOAD, dt, reg1=pow2reg, value=pow2)
-            code += VmCodeInstruction(Opcode.LSLNM, dt, reg1=pow2reg, value=address)
-        } else {
-            if (factor == 0) {
-                code += VmCodeInstruction(Opcode.STOREZM, dt, value=address)
-            }
-            else {
-                val factorReg = vmRegisters.nextFree()
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=factorReg, value = factor)
-                code += VmCodeInstruction(Opcode.MULM, dt, reg1=factorReg, value = address)
-            }
-        }
-        return code
-    }
-
-    internal fun divideByConstFloat(fpReg: Int, factor: Float): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1f)
-            return code
-        if(factor==0f) {
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1 = fpReg, fpValue = Float.MAX_VALUE)
-        } else {
-            val factorReg = vmRegisters.nextFreeFloat()
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1=factorReg, fpValue = factor)
-            code += VmCodeInstruction(Opcode.DIVS, VmDataType.FLOAT, fpReg1 = fpReg, fpReg2 = factorReg)
-        }
-        return code
-    }
-
-    internal fun divideByConstFloatInplace(address: Int, factor: Float): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1f)
-            return code
-        if(factor==0f) {
-            val maxvalueReg = vmRegisters.nextFreeFloat()
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1 = maxvalueReg, fpValue = Float.MAX_VALUE)
-            code += VmCodeInstruction(Opcode.STOREM, VmDataType.FLOAT, fpReg1 = maxvalueReg, value=address)
-        } else {
-            val factorReg = vmRegisters.nextFreeFloat()
-            code += VmCodeInstruction(Opcode.LOAD, VmDataType.FLOAT, fpReg1=factorReg, fpValue = factor)
-            code += VmCodeInstruction(Opcode.DIVSM, VmDataType.FLOAT, fpReg1 = factorReg, value=address)
-        }
-        return code
-    }
-
-    internal fun divideByConst(dt: VmDataType, reg: Int, factor: Int, signed: Boolean): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1)
-            return code
-        val pow2 = powersOfTwo.indexOf(factor)
-        if(pow2==1) {
-            // just shift 1 bit
-            code += if(signed)
-                VmCodeInstruction(Opcode.ASR, dt, reg1=reg)
-            else
-                VmCodeInstruction(Opcode.LSR, dt, reg1=reg)
-        }
-        else if(pow2>=1) {
-            // just shift multiple bits
-            val pow2reg = vmRegisters.nextFree()
-            code += VmCodeInstruction(Opcode.LOAD, dt, reg1=pow2reg, value=pow2)
-            code += if(signed)
-                VmCodeInstruction(Opcode.ASRN, dt, reg1=reg, reg2=pow2reg)
-            else
-                VmCodeInstruction(Opcode.LSRN, dt, reg1=reg, reg2=pow2reg)
-        } else {
-            if (factor == 0) {
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=reg, value=0xffff)
-            }
-            else {
-                val factorReg = vmRegisters.nextFree()
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=factorReg, value= factor)
-                code += if(signed)
-                    VmCodeInstruction(Opcode.DIVS, dt, reg1=reg, reg2=factorReg)
-                else
-                    VmCodeInstruction(Opcode.DIV, dt, reg1=reg, reg2=factorReg)
-            }
-        }
-        return code
-    }
-
-    internal fun divideByConstInplace(dt: VmDataType, address: Int, factor: Int, signed: Boolean): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(factor==1)
-            return code
-        val pow2 = powersOfTwo.indexOf(factor)
-        if(pow2==1) {
-            // just shift 1 bit
-            code += if(signed)
-                VmCodeInstruction(Opcode.ASRM, dt, value=address)
-            else
-                VmCodeInstruction(Opcode.LSRM, dt, value=address)
-        }
-        else if(pow2>=1) {
-            // just shift multiple bits
-            val pow2reg = vmRegisters.nextFree()
-            code += VmCodeInstruction(Opcode.LOAD, dt, reg1=pow2reg, value=pow2)
-            code += if(signed)
-                VmCodeInstruction(Opcode.ASRNM, dt, reg1=pow2reg, value=address)
-            else
-                VmCodeInstruction(Opcode.LSRNM, dt, reg1=pow2reg, value=address)
-        } else {
-            if (factor == 0) {
-                val reg = vmRegisters.nextFree()
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=reg, value=0xffff)
-                code += VmCodeInstruction(Opcode.STOREM, dt, reg1=reg, value=address)
-            }
-            else {
-                val factorReg = vmRegisters.nextFree()
-                code += VmCodeInstruction(Opcode.LOAD, dt, reg1=factorReg, value= factor)
-                code += if(signed)
-                    VmCodeInstruction(Opcode.DIVSM, dt, reg1=factorReg, value=address)
-                else
-                    VmCodeInstruction(Opcode.DIVM, dt, reg1=factorReg, value=address)
-            }
-        }
-        return code
-    }
-
-    private fun translate(ifElse: PtIfElse): VmCodeChunk {
-        if(ifElse.condition.operator !in ComparisonOperators)
-            throw AssemblyError("if condition should only be a binary comparison expression")
-
-        val signed = ifElse.condition.left.type in arrayOf(DataType.BYTE, DataType.WORD, DataType.FLOAT)
-        val vmDt = vmType(ifElse.condition.left.type)
-        val code = VmCodeChunk()
-
-        fun translateNonZeroComparison(): VmCodeChunk {
-            val elseBranch = when(ifElse.condition.operator) {
-                "==" -> Opcode.BNE
-                "!=" -> Opcode.BEQ
-                "<" -> if(signed) Opcode.BGES else Opcode.BGE
-                ">" -> if(signed) Opcode.BLES else Opcode.BLE
-                "<=" -> if(signed) Opcode.BGTS else Opcode.BGT
-                ">=" -> if(signed) Opcode.BLTS else Opcode.BLT
-                else -> throw AssemblyError("invalid comparison operator")
-            }
-
-            val leftReg = vmRegisters.nextFree()
-            val rightReg = vmRegisters.nextFree()
-            code += expressionEval.translateExpression(ifElse.condition.left, leftReg, -1)
-            code += expressionEval.translateExpression(ifElse.condition.right, rightReg, -1)
-            if(ifElse.elseScope.children.isNotEmpty()) {
-                // if and else parts
-                val elseLabel = createLabelName()
-                val afterIfLabel = createLabelName()
-                code += VmCodeInstruction(elseBranch, vmDt, reg1=leftReg, reg2=rightReg, labelSymbol = elseLabel)
-                code += translateNode(ifElse.ifScope)
-                code += VmCodeInstruction(Opcode.JUMP, labelSymbol = afterIfLabel)
-                code += VmCodeLabel(elseLabel)
-                code += translateNode(ifElse.elseScope)
-                code += VmCodeLabel(afterIfLabel)
-            } else {
-                // only if part
-                val afterIfLabel = createLabelName()
-                code += VmCodeInstruction(elseBranch, vmDt, reg1=leftReg, reg2=rightReg, labelSymbol = afterIfLabel)
-                code += translateNode(ifElse.ifScope)
-                code += VmCodeLabel(afterIfLabel)
-            }
-            return code
-        }
-
-        fun translateZeroComparison(): VmCodeChunk {
-            fun equalOrNotEqualZero(elseBranch: Opcode): VmCodeChunk {
-                val leftReg = vmRegisters.nextFree()
-                code += expressionEval.translateExpression(ifElse.condition.left, leftReg, -1)
-                if(ifElse.elseScope.children.isNotEmpty()) {
-                    // if and else parts
-                    val elseLabel = createLabelName()
-                    val afterIfLabel = createLabelName()
-                    code += VmCodeInstruction(elseBranch, vmDt, reg1=leftReg, labelSymbol = elseLabel)
-                    code += translateNode(ifElse.ifScope)
-                    code += VmCodeInstruction(Opcode.JUMP, labelSymbol = afterIfLabel)
-                    code += VmCodeLabel(elseLabel)
-                    code += translateNode(ifElse.elseScope)
-                    code += VmCodeLabel(afterIfLabel)
-                } else {
-                    // only if part
-                    val afterIfLabel = createLabelName()
-                    code += VmCodeInstruction(elseBranch, vmDt, reg1=leftReg, labelSymbol = afterIfLabel)
-                    code += translateNode(ifElse.ifScope)
-                    code += VmCodeLabel(afterIfLabel)
-                }
-                return code
-            }
-
-            return when (ifElse.condition.operator) {
-                "==" -> {
-                    // if X==0 ...   so we just branch on left expr is Not-zero.
-                    equalOrNotEqualZero(Opcode.BNZ)
-                }
-                "!=" -> {
-                    // if X!=0 ...   so we just branch on left expr is Zero.
-                    equalOrNotEqualZero(Opcode.BZ)
-                }
-                else -> {
-                    // another comparison against 0, just use regular codegen for this.
-                    translateNonZeroComparison()
-                }
-            }
-        }
-
-        return if(constValue(ifElse.condition.right)==0.0)
-            translateZeroComparison()
-        else
-            translateNonZeroComparison()
-    }
-
-
-    private fun translate(postIncrDecr: PtPostIncrDecr): VmCodeChunk {
-        val code = VmCodeChunk()
-        val operationMem: Opcode
-        val operationRegister: Opcode
-        when(postIncrDecr.operator) {
-            "++" -> {
-                operationMem = Opcode.INCM
-                operationRegister = Opcode.INC
-            }
-            "--" -> {
-                operationMem = Opcode.DECM
-                operationRegister = Opcode.DEC
-            }
-            else -> throw AssemblyError("weird operator")
-        }
-        val ident = postIncrDecr.target.identifier
-        val memory = postIncrDecr.target.memory
-        val array = postIncrDecr.target.array
-        val vmDt = vmType(postIncrDecr.target.type)
-        if(ident!=null) {
-            val address = allocations.get(ident.targetName)
-            code += VmCodeInstruction(operationMem, vmDt, value = address)
-        } else if(memory!=null) {
-            if(memory.address is PtNumber) {
-                val address = (memory.address as PtNumber).number.toInt()
-                code += VmCodeInstruction(operationMem, vmDt, value = address)
-            } else {
-                val incReg = vmRegisters.nextFree()
-                val addressReg = vmRegisters.nextFree()
-                code += expressionEval.translateExpression(memory.address, addressReg, -1)
-                code += VmCodeInstruction(Opcode.LOADI, vmDt, reg1 = incReg, reg2 = addressReg)
-                code += VmCodeInstruction(operationRegister, vmDt, reg1 = incReg)
-                code += VmCodeInstruction(Opcode.STOREI, vmDt, reg1 = incReg, reg2 = addressReg)
-            }
-        } else if (array!=null) {
-            val variable = array.variable.targetName
-            var variableAddr = allocations.get(variable)
-            val itemsize = program.memsizer.memorySize(array.type)
-            val fixedIndex = constIntValue(array.index)
-            if(fixedIndex!=null) {
-                variableAddr += fixedIndex*itemsize
-                code += VmCodeInstruction(operationMem, vmDt, value=variableAddr)
-            } else {
-                val incReg = vmRegisters.nextFree()
-                val indexReg = vmRegisters.nextFree()
-                code += expressionEval.translateExpression(array.index, indexReg, -1)
-                code += VmCodeInstruction(Opcode.LOADX, vmDt, reg1=incReg, reg2=indexReg, value=variableAddr)
-                code += VmCodeInstruction(operationRegister, vmDt, reg1=incReg)
-                code += VmCodeInstruction(Opcode.STOREX, vmDt, reg1=incReg, reg2=indexReg, value=variableAddr)
-            }
-        } else
-            throw AssemblyError("weird assigntarget")
-
-        return code
-    }
-
-    private fun translate(repeat: PtRepeatLoop): VmCodeChunk {
-        when (constIntValue(repeat.count)) {
-            0 -> return VmCodeChunk()
-            1 -> return translateGroup(repeat.children)
-            256 -> {
-                // 256 iterations can still be done with just a byte counter if you set it to zero as starting value.
-                repeat.children[0] = PtNumber(DataType.UBYTE, 0.0, repeat.count.position)
-            }
-        }
-
-        val code = VmCodeChunk()
-        val counterReg = vmRegisters.nextFree()
-        val vmDt = vmType(repeat.count.type)
-        code += expressionEval.translateExpression(repeat.count, counterReg, -1)
-        val repeatLabel = createLabelName()
-        code += VmCodeLabel(repeatLabel)
-        code += translateNode(repeat.statements)
-        code += VmCodeInstruction(Opcode.DEC, vmDt, reg1=counterReg)
-        code += VmCodeInstruction(Opcode.BNZ, vmDt, reg1=counterReg, labelSymbol = repeatLabel)
-        return code
-    }
-
-    private fun translate(jump: PtJump): VmCodeChunk {
-        val code = VmCodeChunk()
-        if(jump.address!=null)
-            throw AssemblyError("cannot jump to memory location in the vm target")
-        code += if(jump.generatedLabel!=null)
-            VmCodeInstruction(Opcode.JUMP, labelSymbol = listOf(jump.generatedLabel!!))
-        else if(jump.identifier!=null)
-            VmCodeInstruction(Opcode.JUMP, labelSymbol = jump.identifier!!.targetName)
-        else
-            throw AssemblyError("weird jump")
-        return code
-    }
-
-    private fun translateGroup(group: List<PtNode>): VmCodeChunk {
-        val code = VmCodeChunk()
-        group.forEach { code += translateNode(it) }
-        return code
-    }
-
-    private fun translate(ret: PtReturn): VmCodeChunk {
-        val code = VmCodeChunk()
-        val value = ret.value
-        if(value!=null) {
-            // Call Convention: return value is always returned in r0 (or fr0 if float)
-            code += if(value.type==DataType.FLOAT)
-                expressionEval.translateExpression(value, -1, 0)
-            else
-                expressionEval.translateExpression(value, 0, -1)
-        }
-        code += VmCodeInstruction(Opcode.RETURN)
-        return code
-    }
-
-    private fun translate(sub: PtSub): VmCodeChunk {
-        val code = VmCodeChunk()
-        code += VmCodeComment("SUB: ${sub.scopedName} -> ${sub.returntype}")
-        code += VmCodeLabel(sub.scopedName)
-        for (child in sub.children) {
-            code += translateNode(child)
-        }
-        code += VmCodeComment("SUB-END '${sub.name}'")
-        return code
-    }
-
-    private fun translate(block: PtBlock): VmCodeChunk {
-        val code = VmCodeChunk()
-        code += VmCodeComment("BLOCK '${block.name}'  addr=${block.address}  lib=${block.library}")
-        for (child in block.children) {
-            if(child !is PtAssignment) // global variable initialization is done elsewhere
-                code += translateNode(child)
-        }
-        code += VmCodeComment("BLOCK-END '${block.name}'")
-        return code
-    }
-
-
-    internal fun vmType(type: DataType): VmDataType {
-        return when(type) {
-            DataType.UBYTE,
-            DataType.BYTE -> VmDataType.BYTE
-            DataType.UWORD,
-            DataType.WORD -> VmDataType.WORD
-            DataType.FLOAT -> VmDataType.FLOAT
-            in PassByReferenceDatatypes -> VmDataType.WORD
-            else -> throw AssemblyError("no vm datatype for $type")
-        }
-    }
-
-    private var labelSequenceNumber = 0
-    internal fun createLabelName(): List<String> {
-        labelSequenceNumber++
-        return listOf("prog8_label_gen_$labelSequenceNumber")
-    }
-
-    internal fun translateBuiltinFunc(call: PtBuiltinFunctionCall, resultRegister: Int): VmCodeChunk =
-        builtinFuncGen.translate(call, resultRegister)
-
-    internal fun isZero(expression: PtExpression): Boolean = expression is PtNumber && expression.number==0.0
-
-    internal fun isOne(expression: PtExpression): Boolean = expression is PtNumber && expression.number==1.0
-}
-

codeGenVirtual/src/prog8/codegen/virtual/VariableAllocator.kt

@@ -1,91 +0,0 @@
-package prog8.codegen.virtual
-
-import prog8.code.SymbolTable
-import prog8.code.ast.PtProgram
-import prog8.code.core.*
-
-class VariableAllocator(private val st: SymbolTable, private val program: PtProgram, errors: IErrorReporter) {
-
-    private val allocations = mutableMapOf<List<String>, Int>()
-    private var freeMemoryStart: Int
-
-    val freeMem: Int
-        get() = freeMemoryStart
-
-    init {
-        var nextLocation = 0
-        for (variable in st.allVariables) {
-            val memsize =
-                when (variable.dt) {
-                    DataType.STR -> variable.initialStringValue!!.first.length + 1  // include the zero byte
-                    in NumericDatatypes -> program.memsizer.memorySize(variable.dt)
-                    in ArrayDatatypes -> program.memsizer.memorySize(variable.dt, variable.length!!)
-                    else -> throw InternalCompilerException("weird dt")
-                }
-
-            allocations[variable.scopedName] = nextLocation
-            nextLocation += memsize
-        }
-
-        freeMemoryStart = nextLocation
-    }
-
-    fun get(name: List<String>) = allocations.getValue(name)
-
-    fun asVmMemory(): List<Pair<List<String>, String>> {
-        val mm = mutableListOf<Pair<List<String>, String>>()
-        for (variable in st.allVariables) {
-            val location = allocations.getValue(variable.scopedName)
-            val typeStr = when(variable.dt) {
-                DataType.UBYTE, DataType.ARRAY_UB, DataType.STR -> "ubyte"
-                DataType.BYTE, DataType.ARRAY_B -> "byte"
-                DataType.UWORD, DataType.ARRAY_UW -> "uword"
-                DataType.WORD, DataType.ARRAY_W -> "word"
-                DataType.FLOAT, DataType.ARRAY_F -> "float"
-                else -> throw InternalCompilerException("weird dt")
-            }
-            val value = when(variable.dt) {
-                DataType.FLOAT -> (variable.initialNumericValue ?: 0.0).toString()
-                in NumericDatatypes -> (variable.initialNumericValue ?: 0).toHex()
-                DataType.STR -> {
-                    val encoded = program.encoding.encodeString(variable.initialStringValue!!.first, variable.initialStringValue!!.second)
-                    encoded.joinToString(",") { it.toInt().toHex() } + ",0"
-                }
-                DataType.ARRAY_F -> {
-                    if(variable.initialArrayValue!=null) {
-                        variable.initialArrayValue!!.joinToString(",") { it.number!!.toString() }
-                    } else {
-                        (1..variable.length!!).joinToString(",") { "0" }
-                    }
-                }
-                in ArrayDatatypes -> {
-                    if(variable.initialArrayValue!==null) {
-                        variable.initialArrayValue!!.joinToString(",") { it.number!!.toHex() }
-                    } else {
-                        (1..variable.length!!).joinToString(",") { "0" }
-                    }
-                }
-                else -> throw InternalCompilerException("weird dt")
-            }
-            mm.add(Pair(variable.scopedName, "$location $typeStr $value"))
-        }
-        return mm
-    }
-
-    private val memorySlabsInternal = mutableMapOf<String, Triple<UInt, UInt, UInt>>()
-    internal val memorySlabs: Map<String, Triple<UInt, UInt, UInt>> = memorySlabsInternal
-
-    fun allocateMemorySlab(name: String, size: UInt, align: UInt): UInt {
-        val address =
-            if(align==0u || align==1u)
-                freeMemoryStart.toUInt()
-            else
-                (freeMemoryStart.toUInt() + align-1u) and (0xffffffffu xor (align-1u))
-
-        memorySlabsInternal[name] = Triple(address, size, align)
-        freeMemoryStart = (address + size).toInt()
-        return address
-    }
-
-    fun getMemorySlab(name: String): Triple<UInt, UInt, UInt>? = memorySlabsInternal[name]
-}

codeGenVirtual/src/prog8/codegen/virtual/VmAssemblyProgram.kt

@@ -0,0 +1,103 @@
+package prog8.codegen.virtual
+
+import prog8.code.core.AssemblyError
+import prog8.code.core.CompilationOptions
+import prog8.code.core.IAssemblyProgram
+import prog8.intermediate.*
+import java.io.BufferedWriter
+import kotlin.io.path.bufferedWriter
+import kotlin.io.path.div
+
+internal class VmAssemblyProgram(override val name: String, private val irProgram: IRProgram): IAssemblyProgram {
+
+    override fun assemble(dummyOptions: CompilationOptions): Boolean {
+        val outfile = irProgram.options.outputDir / ("$name.p8virt")
+        println("write code to $outfile")
+
+        // at last, allocate the variables in memory.
+        val allocations = VmVariableAllocator(irProgram.st, irProgram.encoding, irProgram.options.compTarget)
+
+        outfile.bufferedWriter().use { out ->
+            allocations.asVmMemory().forEach { (name, alloc) ->
+                out.write("var ${name.joinToString(".")} $alloc\n")
+            }
+
+            out.write("------PROGRAM------\n")
+
+            if(!irProgram.options.dontReinitGlobals) {
+                out.write("; global var inits\n")
+                irProgram.globalInits.forEach { out.writeLine(it) }
+            }
+            irProgram.blocks.firstOrNull()?.let {
+                if(it.subroutines.any { it.name=="main.start" }) {
+                    // there is a "main.start" entrypoint, jump to it
+                    out.writeLine(IRCodeInstruction(Opcode.JUMP, labelSymbol = "main.start"))
+                }
+            }
+
+            out.write("; actual program code\n")
+
+            irProgram.blocks.forEach { block ->
+                if(block.address!=null)
+                    TODO("blocks can't have a load address for vm")
+                out.write("; BLOCK ${block.name} ${block.position}\n")
+                block.inlineAssembly.forEach { asm ->
+                    out.write("; ASM ${asm.position}\n")
+                    out.write(asm.assembly)
+                    out.write("\n")
+                }
+                block.subroutines.forEach { sub ->
+                    out.write("; SUB ${sub.name} ${sub.position}\n")
+                    out.write("_${sub.name}:\n")
+                    sub.chunks.forEach { chunk ->
+                        if(chunk is IRInlineAsmChunk) {
+                            out.write("; ASM ${chunk.position}\n")
+                            out.write(processInlinedAsm(chunk.assembly, allocations))
+                            out.write("\n")
+                        } else {
+                            chunk.lines.forEach { out.writeLine(it) }
+                        }
+                    }
+                    out.write("; END SUB ${sub.name}\n")
+                }
+                block.asmSubroutines.forEach { sub ->
+                    out.write("; ASMSUB ${sub.name} ${sub.position}\n")
+                    out.write("_${sub.name}:\n")
+                    out.write(processInlinedAsm(sub.assembly, allocations))
+                    out.write("\n; END ASMSUB ${sub.name}\n")
+                }
+                out.write("; END BLOCK ${block.name}\n")
+            }
+        }
+        return true
+    }
+
+    private fun processInlinedAsm(asm: String, allocations: VmVariableAllocator): String {
+        // TODO do we have to replace variable names by their allocated address???
+        return asm
+    }
+}
+
+private fun BufferedWriter.writeLine(line: IRCodeLine) {
+    when(line) {
+        is IRCodeComment -> {
+            write("; ${line.comment}\n")
+        }
+        is IRCodeInstruction -> {
+            write(line.ins.toString() + "\n")
+        }
+        is IRCodeInlineBinary -> {
+            write("!binary ")
+            line.data.withIndex().forEach {(index, byte) ->
+                write(byte.toString(16).padStart(2,'0'))
+                if(index and 63 == 63 && index<line.data.size-1)
+                    write("\n!binary ")
+            }
+            write("\n")
+        }
+        is IRCodeLabel -> {
+            write("_${line.name}:\n")
+        }
+        else -> throw AssemblyError("invalid IR code line")
+    }
+}

codeGenVirtual/src/prog8/codegen/virtual/VmCodeGen.kt

@@ -0,0 +1,40 @@
+package prog8.codegen.virtual
+
+import prog8.code.SymbolTable
+import prog8.code.ast.PtProgram
+import prog8.code.core.CompilationOptions
+import prog8.code.core.IAssemblyGenerator
+import prog8.code.core.IAssemblyProgram
+import prog8.code.core.IErrorReporter
+import prog8.codegen.intermediate.IRCodeGen
+import prog8.intermediate.IRFileReader
+import prog8.intermediate.IRFileWriter
+import java.nio.file.Path
+
+class VmCodeGen(private val program: PtProgram,
+                private val symbolTable: SymbolTable,
+                private val options: CompilationOptions,
+                private val errors: IErrorReporter
+): IAssemblyGenerator {
+    override fun compileToAssembly(): IAssemblyProgram? {
+
+        val irCodeGen = IRCodeGen(program, symbolTable, options, errors)
+        val irProgram = irCodeGen.generate()
+
+        return if(options.keepIR) {
+            //create IR file on disk and read it back.
+            IRFileWriter(irProgram).writeFile()
+            val irProgram2 = IRFileReader(options.outputDir, irProgram.name).readFile()
+            VmAssemblyProgram(irProgram2.name, irProgram2)
+        } else {
+            VmAssemblyProgram(irProgram.name, irProgram)
+        }
+    }
+
+    companion object {
+        fun compileIR(listingFilename: String): IAssemblyProgram {
+            val irProgram = IRFileReader(Path.of(""), listingFilename).readFile()
+            return VmAssemblyProgram(irProgram.name, irProgram)
+        }
+    }
+}

codeGenVirtual/src/prog8/codegen/virtual/VmVariableAllocator.kt

@@ -0,0 +1,92 @@
+package prog8.codegen.virtual
+
+import prog8.code.SymbolTable
+import prog8.code.core.*
+import prog8.intermediate.getTypeString
+
+internal class VmVariableAllocator(val st: SymbolTable, val encoding: IStringEncoding, memsizer: IMemSizer) {
+
+    internal val allocations = mutableMapOf<List<String>, Int>()
+    private var freeMemoryStart: Int
+
+    val freeMem: Int
+        get() = freeMemoryStart
+
+
+    init {
+        var nextLocation = 0
+        for (variable in st.allVariables) {
+            val memsize =
+                when (variable.dt) {
+                    DataType.STR -> variable.onetimeInitializationStringValue!!.first.length + 1  // include the zero byte
+                    in NumericDatatypes -> memsizer.memorySize(variable.dt)
+                    in ArrayDatatypes -> memsizer.memorySize(variable.dt, variable.length!!)
+                    else -> throw InternalCompilerException("weird dt")
+                }
+
+            allocations[variable.scopedName] = nextLocation
+            nextLocation += memsize
+        }
+        for(slab in st.allMemorySlabs) {
+            // we ignore the alignment for the VM.
+            allocations[slab.scopedName] = nextLocation
+            nextLocation += slab.size.toInt()
+        }
+
+        freeMemoryStart = nextLocation
+    }
+
+    fun asVmMemory(): List<Pair<List<String>, String>> {
+        val mm = mutableListOf<Pair<List<String>, String>>()
+
+        // normal variables
+        for (variable in st.allVariables) {
+            val location = allocations.getValue(variable.scopedName)
+            val value = when(variable.dt) {
+                DataType.FLOAT -> (variable.onetimeInitializationNumericValue ?: 0.0).toString()
+                in NumericDatatypes -> (variable.onetimeInitializationNumericValue ?: 0).toHex()
+                DataType.STR -> {
+                    val encoded = encoding.encodeString(variable.onetimeInitializationStringValue!!.first, variable.onetimeInitializationStringValue!!.second) + listOf(0u)
+                    encoded.joinToString(",") { it.toInt().toHex() }
+                }
+                DataType.ARRAY_F -> {
+                    if(variable.onetimeInitializationArrayValue!=null) {
+                        variable.onetimeInitializationArrayValue!!.joinToString(",") { it.number!!.toString() }
+                    } else {
+                        (1..variable.length!!).joinToString(",") { "0" }
+                    }
+                }
+                in ArrayDatatypes -> {
+                    if(variable.onetimeInitializationArrayValue!==null) {
+                        variable.onetimeInitializationArrayValue!!.joinToString(",") { it.number!!.toHex() }
+                    } else {
+                        (1..variable.length!!).joinToString(",") { "0" }
+                    }
+                }
+                else -> throw InternalCompilerException("weird dt")
+            }
+            mm.add(Pair(variable.scopedName, "@$location ${getTypeString(variable)} $value"))
+        }
+
+        // memory mapped variables
+        for (variable in st.allMemMappedVariables) {
+            val value = when(variable.dt) {
+                DataType.FLOAT -> "0.0"
+                in NumericDatatypes -> "0"
+                DataType.ARRAY_F -> (1..variable.length!!).joinToString(",") { "0.0" }
+                in ArrayDatatypes -> (1..variable.length!!).joinToString(",") { "0" }
+                else -> throw InternalCompilerException("weird dt for mem mapped var")
+            }
+            mm.add(Pair(variable.scopedName, "@${variable.address} ${getTypeString(variable)} $value"))
+        }
+
+        // memory slabs.
+        for(slab in st.allMemorySlabs) {
+            val address = allocations.getValue(slab.scopedName)
+            mm.add(Pair(slab.scopedName, "@$address ubyte[${slab.size}] 0"))
+        }
+
+        return mm
+    }
+
+}

codeOptimizers/src/prog8/optimizer/BinExprSplitter.kt

@@ -22,6 +22,9 @@ class BinExprSplitter(private val program: Program, private val options: Compila
 
     override fun after(assignment: Assignment, parent: Node): Iterable<IAstModification> {
 
+        if(options.compTarget.name == VMTarget.NAME)
+            return noModifications  // don't split expressions when targeting the vm codegen, it handles nested expressions well
+
         if(assignment.value.inferType(program) istype DataType.FLOAT && !options.optimizeFloatExpressions)
             return noModifications
 

codeOptimizers/src/prog8/optimizer/ConstExprEvaluator.kt

@@ -22,9 +22,6 @@ class ConstExprEvaluator {
                 "&" -> bitwiseand(left, right)
                 "|" -> bitwiseor(left, right)
                 "^" -> bitwisexor(left, right)
-                "and" -> logicaland(left, right)
-                "or" -> logicalor(left, right)
-                "xor" -> logicalxor(left, right)
                 "<" -> NumericLiteral.fromBoolean(left < right, left.position)
                 ">" -> NumericLiteral.fromBoolean(left > right, left.position)
                 "<=" -> NumericLiteral.fromBoolean(left <= right, left.position)
@@ -58,57 +55,6 @@ class ConstExprEvaluator {
         return NumericLiteral(left.type, result.toDouble(), left.position)
     }
 
-    private fun logicalxor(left: NumericLiteral, right: NumericLiteral): NumericLiteral {
-        val error = "cannot compute $left locical-bitxor $right"
-        return when (left.type) {
-            in IntegerDatatypes -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean((left.number.toInt() != 0) xor (right.number.toInt() != 0), left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean((left.number.toInt() != 0) xor (right.number != 0.0), left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            DataType.FLOAT -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean((left.number != 0.0) xor (right.number.toInt() != 0), left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean((left.number != 0.0) xor (right.number != 0.0), left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            else -> throw ExpressionError(error, left.position)
-        }
-    }
-
-    private fun logicalor(left: NumericLiteral, right: NumericLiteral): NumericLiteral {
-        val error = "cannot compute $left locical-or $right"
-        return when (left.type) {
-            in IntegerDatatypes -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean(left.number.toInt() != 0 || right.number.toInt() != 0, left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean(left.number.toInt() != 0 || right.number != 0.0, left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            DataType.FLOAT -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean(left.number != 0.0 || right.number.toInt() != 0, left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean(left.number != 0.0 || right.number != 0.0, left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            else -> throw ExpressionError(error, left.position)
-        }
-    }
-
-    private fun logicaland(left: NumericLiteral, right: NumericLiteral): NumericLiteral {
-        val error = "cannot compute $left locical-and $right"
-        return when (left.type) {
-            in IntegerDatatypes -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean(left.number.toInt() != 0 && right.number.toInt() != 0, left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean(left.number.toInt() != 0 && right.number != 0.0, left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            DataType.FLOAT -> when (right.type) {
-                in IntegerDatatypes -> NumericLiteral.fromBoolean(left.number != 0.0 && right.number.toInt() != 0, left.position)
-                DataType.FLOAT -> NumericLiteral.fromBoolean(left.number != 0.0 && right.number != 0.0, left.position)
-                else -> throw ExpressionError(error, left.position)
-            }
-            else -> throw ExpressionError(error, left.position)
-        }
-    }
-
     private fun bitwisexor(left: NumericLiteral, right: NumericLiteral): NumericLiteral {
         if(left.type== DataType.UBYTE) {
             if(right.type in IntegerDatatypes) {

codeOptimizers/src/prog8/optimizer/ConstantFoldingOptimizer.kt

@@ -2,7 +2,6 @@ package prog8.optimizer
 
 import prog8.ast.Node
 import prog8.ast.Program
-import prog8.ast.base.ExpressionError
 import prog8.ast.base.FatalAstException
 import prog8.ast.base.UndefinedSymbolError
 import prog8.ast.expressions.*
@@ -14,7 +13,6 @@ import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.code.core.AssociativeOperators
 import prog8.code.core.DataType
-import prog8.code.core.IntegerDatatypes
 
 
 class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
@@ -36,59 +34,8 @@ class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
     }
 
     override fun after(expr: PrefixExpression, parent: Node): Iterable<IAstModification> {
-        // Try to turn a unary prefix expression into a single constant value.
+        val constValue = expr.constValue(program) ?: return noModifications
-        // Compile-time constant sub expressions will be evaluated on the spot.
+        return listOf(IAstModification.ReplaceNode(expr, constValue, parent))
-        // For instance, the expression for "- 4.5" will be optimized into the float literal -4.5
-        val subexpr = expr.expression
-        if (subexpr is NumericLiteral) {
-            // accept prefixed literal values (such as -3, not true)
-            return when (expr.operator) {
-                "+" -> listOf(IAstModification.ReplaceNode(expr, subexpr, parent))
-                "-" -> when (subexpr.type) {
-                    in IntegerDatatypes -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral.optimalInteger(-subexpr.number.toInt(), subexpr.position),
-                                parent))
-                    }
-                    DataType.FLOAT -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral(DataType.FLOAT, -subexpr.number, subexpr.position),
-                                parent))
-                    }
-                    else -> throw ExpressionError("can only take negative of int or float", subexpr.position)
-                }
-                "~" -> when (subexpr.type) {
-                    DataType.BYTE -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral(DataType.BYTE, subexpr.number.toInt().inv().toDouble(), subexpr.position),
-                                parent))
-                    }
-                    DataType.UBYTE -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral(DataType.UBYTE, (subexpr.number.toInt().inv() and 255).toDouble(), subexpr.position),
-                                parent))
-                    }
-                    DataType.WORD -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral(DataType.WORD, subexpr.number.toInt().inv().toDouble(), subexpr.position),
-                                parent))
-                    }
-                    DataType.UWORD -> {
-                        listOf(IAstModification.ReplaceNode(expr,
-                                NumericLiteral(DataType.UWORD, (subexpr.number.toInt().inv() and 65535).toDouble(), subexpr.position),
-                                parent))
-                    }
-                    else -> throw ExpressionError("can only take bitwise inversion of int", subexpr.position)
-                }
-                "not" -> {
-                    listOf(IAstModification.ReplaceNode(expr,
-                            NumericLiteral.fromBoolean(subexpr.number == 0.0, subexpr.position),
-                            parent))
-                }
-                else -> throw ExpressionError(expr.operator, subexpr.position)
-            }
-        }
-        return noModifications
     }
 
     /*
@@ -318,7 +265,6 @@ class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
     }
 
     override fun after(functionCallExpr: FunctionCallExpression, parent: Node): Iterable<IAstModification> {
-        // the args of a fuction are constfolded via recursion already.
         val constvalue = functionCallExpr.constValue(program)
         return if(constvalue!=null)
             listOf(IAstModification.ReplaceNode(functionCallExpr, constvalue, parent))
@@ -326,6 +272,14 @@ class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
             noModifications
     }
 
+    override fun after(bfc: BuiltinFunctionCall, parent: Node): Iterable<IAstModification> {
+        val constvalue = bfc.constValue(program)
+        return if(constvalue!=null)
+            listOf(IAstModification.ReplaceNode(bfc, constvalue, parent))
+        else
+            noModifications
+    }
+
     override fun after(forLoop: ForLoop, parent: Node): Iterable<IAstModification> {
         fun adjustRangeDt(rangeFrom: NumericLiteral, targetDt: DataType, rangeTo: NumericLiteral, stepLiteral: NumericLiteral?, range: RangeExpression): RangeExpression? {
             val fromCast = rangeFrom.cast(targetDt)

codeOptimizers/src/prog8/optimizer/ExpressionSimplifier.kt

@@ -12,17 +12,15 @@ import prog8.ast.statements.IfElse
 import prog8.ast.statements.Jump
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
-import prog8.code.core.AssociativeOperators
+import prog8.code.core.*
-import prog8.code.core.DataType
+import prog8.code.target.VMTarget
-import prog8.code.core.IntegerDatatypes
-import prog8.code.core.NumericDatatypes
 import kotlin.math.abs
 import kotlin.math.log2
 import kotlin.math.pow
 
 // TODO add more peephole expression optimizations? Investigate what optimizations binaryen has, also see  https://egorbo.com/peephole-optimizations.html
 
-class ExpressionSimplifier(private val program: Program) : AstWalker() {
+class ExpressionSimplifier(private val program: Program, private val compTarget: ICompilationTarget) : AstWalker() {
     private val powersOfTwo = (1..16).map { (2.0).pow(it) }.toSet()
     private val negativePowersOfTwo = powersOfTwo.map { -it }.toSet()
 
@@ -33,8 +31,9 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
         val literal = typecast.expression as? NumericLiteral
         if (literal != null) {
             val newLiteral = literal.cast(typecast.type)
-            if (newLiteral.isValid && newLiteral.valueOrZero() !== literal)
+            if (newLiteral.isValid && newLiteral.valueOrZero() !== literal) {
-                mods += IAstModification.ReplaceNode(typecast.expression, newLiteral.valueOrZero(), typecast)
+                mods += IAstModification.ReplaceNode(typecast, newLiteral.valueOrZero(), parent)
+            }
         }
 
         // remove redundant nested typecasts
@@ -76,6 +75,22 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                 }
             }
         }
+
+        if(compTarget.name!=VMTarget.NAME) {
+            val booleanCondition = ifElse.condition as? BinaryExpression
+            if(booleanCondition!=null && booleanCondition.operator=="&") {
+                // special optimization of WORD & $ff00  ->  just and the msb of WORD with $ff
+                val rightNum = booleanCondition.right as? NumericLiteral
+                if(rightNum!=null && rightNum.type==DataType.UWORD && (rightNum.number.toInt() and 0x00ff)==0) {
+                    val msb = BuiltinFunctionCall(IdentifierReference(listOf("msb"), booleanCondition.left.position), mutableListOf(booleanCondition.left), booleanCondition.left.position)
+                    val bytevalue = NumericLiteral(DataType.UBYTE, (rightNum.number.toInt() shr 8).toDouble(), booleanCondition.right.position)
+                    return listOf(
+                        IAstModification.ReplaceNode(booleanCondition.left, msb, booleanCondition),
+                        IAstModification.ReplaceNode(booleanCondition.right, bytevalue, booleanCondition))
+                }
+            }
+        }
+
         return noModifications
     }
 
@@ -196,35 +211,19 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
             }
         }
 
+        // boolvar & 1  --> boolvar
+        // boolvar & 2  --> false
+        if(expr.operator=="&" && rightDt in IntegerDatatypes && (leftDt == DataType.BOOL || (expr.left as? TypecastExpression)?.expression?.inferType(program)?.istype(DataType.BOOL)==true)) {
+            if(rightVal?.number==1.0) {
+                return listOf(IAstModification.ReplaceNode(expr, expr.left, parent))
+            } else if(rightVal?.number!=null && (rightVal.number.toInt() and 1)==0) {
+                return listOf(IAstModification.ReplaceNode(expr, NumericLiteral.fromBoolean(false, expr.position), parent))
+            }
+        }
+
         // simplify when a term is constant and directly determines the outcome
-        val constTrue = NumericLiteral.fromBoolean(true, expr.position)
         val constFalse = NumericLiteral.fromBoolean(false, expr.position)
         val newExpr: Expression? = when (expr.operator) {
-            "or" -> {
-                when {
-                    leftVal != null && leftVal.asBooleanValue || rightVal != null && rightVal.asBooleanValue -> constTrue
-                    leftVal != null && !leftVal.asBooleanValue -> expr.right
-                    rightVal != null && !rightVal.asBooleanValue -> expr.left
-                    else -> null
-                }
-            }
-            "and" -> {
-                when {
-                    leftVal != null && !leftVal.asBooleanValue || rightVal != null && !rightVal.asBooleanValue -> constFalse
-                    leftVal != null && leftVal.asBooleanValue -> expr.right
-                    rightVal != null && rightVal.asBooleanValue -> expr.left
-                    else -> null
-                }
-            }
-            "xor" -> {
-                when {
-                    leftVal != null && !leftVal.asBooleanValue -> expr.right
-                    rightVal != null && !rightVal.asBooleanValue -> expr.left
-                    leftVal != null && leftVal.asBooleanValue -> PrefixExpression("not", expr.right, expr.right.position)
-                    rightVal != null && rightVal.asBooleanValue -> PrefixExpression("not", expr.left, expr.left.position)
-                    else -> null
-                }
-            }
             "|" -> {
                 when {
                     leftVal?.number==0.0 -> expr.right
@@ -268,6 +267,28 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
             else -> null
         }
 
+        if(rightVal!=null && leftDt==DataType.BOOL) {
+            // see if we can replace comparison against true/1 with simpler comparison against zero
+            if (expr.operator == "==") {
+                if (rightVal.number == 1.0) {
+                    val zero = NumericLiteral(DataType.UBYTE, 0.0, expr.right.position)
+                    return listOf(
+                        IAstModification.SetExpression({expr.operator="!="}, expr, parent),
+                        IAstModification.ReplaceNode(expr.right, zero, expr)
+                    )
+                }
+            }
+            if (expr.operator == "!=") {
+                if (rightVal.number == 1.0) {
+                    val zero = NumericLiteral(DataType.UBYTE, 0.0, expr.right.position)
+                    return listOf(
+                        IAstModification.SetExpression({expr.operator="=="}, expr, parent),
+                        IAstModification.ReplaceNode(expr.right, zero, expr)
+                    )
+                }
+            }
+        }
+
         if(newExpr != null)
             return listOf(IAstModification.ReplaceNode(expr, newExpr, parent))
 
@@ -286,6 +307,12 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                     return listOf(IAstModification.ReplaceNode(functionCallExpr, arg.expression, parent))
                 }
             } else {
+                if(arg is IdentifierReference && arg.nameInSource.size==2
+                    && arg.nameInSource[0]=="cx16" && arg.nameInSource[1].uppercase() in RegisterOrPair.names) {
+                    // lsb(cx16.r0) -> cx16.r0L
+                    val highReg = IdentifierReference(listOf("cx16", arg.nameInSource[1]+'L'), arg.position)
+                    return listOf(IAstModification.ReplaceNode(functionCallExpr, highReg, parent))
+                }
                 val argDt = arg.inferType(program)
                 if (argDt istype DataType.BYTE || argDt istype DataType.UBYTE) {
                     // useless lsb() of byte value
@@ -307,6 +334,12 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                             parent))
                 }
             } else {
+                if(arg is IdentifierReference && arg.nameInSource.size==2
+                    && arg.nameInSource[0]=="cx16" && arg.nameInSource[1].uppercase() in RegisterOrPair.names) {
+                    // msb(cx16.r0) -> cx16.r0H
+                    val highReg = IdentifierReference(listOf("cx16", arg.nameInSource[1]+'H'), arg.position)
+                    return listOf(IAstModification.ReplaceNode(functionCallExpr, highReg, parent))
+                }
                 val argDt = arg.inferType(program)
                 if (argDt istype DataType.BYTE || argDt istype DataType.UBYTE) {
                     // useless msb() of byte value, replace with 0
@@ -318,25 +351,14 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
             }
         }
 
-        return noModifications
+        if(functionCallExpr.target.nameInSource == listOf("mkword")) {
+            if(functionCallExpr.args[0].constValue(program)?.number==0.0) {
+                // just cast the lsb to uword
+                val cast = TypecastExpression(functionCallExpr.args[1], DataType.UWORD, true, functionCallExpr.position)
+                return listOf(IAstModification.ReplaceNode(functionCallExpr, cast, parent))
+            }
         }
 
-    override fun after(containment: ContainmentCheck, parent: Node): Iterable<IAstModification> {
-        val range = containment.iterable as? RangeExpression
-        if(range!=null && range.step.constValue(program)?.number==1.0) {
-            val from = range.from.constValue(program)
-            val to = range.to.constValue(program)
-            val value = containment.element
-            if(from!=null && to!=null && value.isSimple) {
-                if(to.number-from.number>6.0) {
-                    // replace containment test with X>=from and X<=to
-                    val left = BinaryExpression(value, ">=", from, containment.position)
-                    val right = BinaryExpression(value.copy(), "<=", to, containment.position)
-                    val comparison = BinaryExpression(left, "and", right, containment.position)
-                    return listOf(IAstModification.ReplaceNode(containment, comparison, parent))
-                }
-            }
-        }
         return noModifications
     }
 
@@ -472,19 +494,14 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                     }
                 }
                 in powersOfTwo -> {
-                    if (leftDt in IntegerDatatypes) {
+                    if (leftDt==DataType.UBYTE || leftDt==DataType.UWORD) {
-                        // divided by a power of two => shift right
+                        // Unsigned number divided by a power of two => shift right
+                        // Signed number can't simply be bitshifted in this case (due to rounding issues for negative values),
+                        // so we leave that as is and let the code generator deal with it.
                         val numshifts = log2(cv).toInt()
                         return BinaryExpression(expr.left, ">>", NumericLiteral.optimalInteger(numshifts, expr.position), expr.position)
                     }
                 }
-                in negativePowersOfTwo -> {
-                    if (leftDt in IntegerDatatypes) {
-                        // divided by a negative power of two => negate, then shift right
-                        val numshifts = log2(-cv).toInt()
-                        return BinaryExpression(PrefixExpression("-", expr.left, expr.position), ">>", NumericLiteral.optimalInteger(numshifts, expr.position), expr.position)
-                    }
-                }
             }
 
             if (leftDt == DataType.UBYTE) {
@@ -542,9 +559,10 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                 }
                 in negativePowersOfTwo -> {
                     if (leftValue.inferType(program).isInteger) {
-                        // times a negative power of two => negate, then shift left
+                        // times a negative power of two => negate, then shift
                         val numshifts = log2(-cv).toInt()
-                        return BinaryExpression(PrefixExpression("-", expr2.left, expr.position), "<<", NumericLiteral.optimalInteger(numshifts, expr.position), expr.position)
+                        val negation = PrefixExpression("-", expr2.left, expr.position)
+                        return BinaryExpression(negation, "<<", NumericLiteral.optimalInteger(numshifts, expr.position), expr.position)
                     }
                 }
             }
@@ -574,7 +592,14 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
             DataType.UWORD, DataType.WORD -> {
                 if (amount >= 16) {
                     return NumericLiteral(targetDt, 0.0, expr.position)
-                } else if (amount > 8) {
+                }
+                else if(amount==8) {
+                    // shift left by 8 bits is just a byte operation: mkword(lsb(X), 0)
+                    val lsb = FunctionCallExpression(IdentifierReference(listOf("lsb"), expr.position), mutableListOf(expr.left), expr.position)
+                    return FunctionCallExpression(IdentifierReference(listOf("mkword"), expr.position), mutableListOf(lsb, NumericLiteral(DataType.UBYTE, 0.0, expr.position)), expr.position)
+                }
+                else if (amount > 8) {
+                    // same as above but with residual shifts.
                     val lsb = FunctionCallExpression(IdentifierReference(listOf("lsb"), expr.position), mutableListOf(expr.left), expr.position)
                     val shifted = BinaryExpression(lsb, "<<", NumericLiteral.optimalInteger(amount - 8, expr.position), expr.position)
                     return FunctionCallExpression(IdentifierReference(listOf("mkword"), expr.position), mutableListOf(shifted, NumericLiteral.optimalInteger(0, expr.position)), expr.position)
@@ -613,12 +638,19 @@ class ExpressionSimplifier(private val program: Program) : AstWalker() {
                 if (amount >= 16) {
                     return NumericLiteral.optimalInteger(0, expr.position)
                 }
+                else if(amount==8) {
+                    // shift right by 8 bits is just a byte operation: msb(X) as uword
+                    val msb = FunctionCallExpression(IdentifierReference(listOf("msb"), expr.position), mutableListOf(expr.left), expr.position)
+                    return TypecastExpression(msb, DataType.UWORD, true, expr.position)
+                }
                 else if (amount > 8) {
+                    // same as above but with residual shifts.
                     val msb = FunctionCallExpression(IdentifierReference(listOf("msb"), expr.position), mutableListOf(expr.left), expr.position)
                     return TypecastExpression(BinaryExpression(msb, ">>", NumericLiteral.optimalInteger(amount - 8, expr.position), expr.position), DataType.UWORD, true, expr.position)
                 }
             }
             DataType.WORD -> {
+                // bit-shifting a signed value shouldn't be allowed by the compiler but here we go...
                 if (amount > 16) {
                     expr.right = NumericLiteral.optimalInteger(16, expr.right.position)
                     return null

codeOptimizers/src/prog8/optimizer/Extensions.kt

@@ -60,8 +60,8 @@ fun Program.inlineSubroutines(): Int {
     return inliner.applyModifications()
 }
 
-fun Program.simplifyExpressions() : Int {
+fun Program.simplifyExpressions(target: ICompilationTarget) : Int {
-    val opti = ExpressionSimplifier(this)
+    val opti = ExpressionSimplifier(this, target)
     opti.visit(this)
     return opti.applyModifications()
 }

codeOptimizers/src/prog8/optimizer/Inliner.kt

@@ -106,7 +106,7 @@ class Inliner(val program: Program): AstWalker() {
                                     } else
                                         false
                                 }
-                                is Jump, is GoSub -> true
+                                is Jump -> true
                                 else -> false
                             }
                     }
@@ -170,15 +170,6 @@ class Inliner(val program: Program): AstWalker() {
         return super.before(program)
     }
 
-    override fun after(gosub: GoSub, parent: Node): Iterable<IAstModification> {
-        val sub = gosub.identifier.targetStatement(program) as? Subroutine
-        return if(sub==null)
-            noModifications
-        else
-            possibleInlineFcallStmt(sub, gosub, parent)
-
-    }
-
     private fun possibleInlineFcallStmt(sub: Subroutine, origNode: Node, parent: Node): Iterable<IAstModification> {
         if(sub.inline && sub.parameters.isEmpty()) {
             require(sub.statements.size == 1 || (sub.statements.size == 2 && isEmptyReturn(sub.statements[1])))

codeOptimizers/src/prog8/optimizer/StatementOptimizer.kt

@@ -73,31 +73,6 @@ class StatementOptimizer(private val program: Program,
             }
         }
 
-        // if the first instruction in the called subroutine is a return statement, remove the jump altogeter
-        val subroutine = functionCallStatement.target.targetSubroutine(program)
-        if(subroutine!=null) {
-            val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
-            if(first is Return)
-                return listOf(IAstModification.Remove(functionCallStatement, parent as IStatementContainer))
-        }
-
-        if(compTarget.name!=VMTarget.NAME) {
-            // see if we can optimize any complex argument expressions to be just a simple variable
-            // TODO for now, only works for single-argument functions because we use just 1 temp var: R9
-            if(functionCallStatement.target.nameInSource !in listOf(listOf("pop"), listOf("popw")) && functionCallStatement.args.size==1) {
-                val arg = functionCallStatement.args[0]
-                if(!arg.isSimple && arg !is IFunctionCall) {
-                    val name = getTempRegisterName(arg.inferType(program))
-                    val tempvar = IdentifierReference(name, functionCallStatement.position)
-                    val assignTempvar = Assignment(AssignTarget(tempvar.copy(), null, null, functionCallStatement.position), arg, AssignmentOrigin.OPTIMIZER, functionCallStatement.position)
-                    return listOf(
-                        IAstModification.InsertBefore(functionCallStatement, assignTempvar, parent as IStatementContainer),
-                        IAstModification.ReplaceNode(arg, tempvar, functionCallStatement)
-                    )
-                }
-            }
-        }
-
         return noModifications
     }
 
@@ -108,7 +83,7 @@ class StatementOptimizer(private val program: Program,
 
         // empty true part? switch with the else part
         if(ifElse.truepart.isEmpty() && ifElse.elsepart.isNotEmpty()) {
-            val invertedCondition = PrefixExpression("not", ifElse.condition, ifElse.condition.position)
+            val invertedCondition = BinaryExpression(ifElse.condition, "==", NumericLiteral(DataType.UBYTE, 0.0, ifElse.condition.position), ifElse.condition.position)
             val emptyscope = AnonymousScope(mutableListOf(), ifElse.elsepart.position)
             val truepart = AnonymousScope(ifElse.elsepart.statements, ifElse.truepart.position)
             return listOf(
@@ -244,25 +219,6 @@ class StatementOptimizer(private val program: Program,
         return noModifications
     }
 
-
-    // NOTE: do NOT remove a jump to the next statement, because this will lead to wrong code when this occurs at the end of a subroutine
-    // if we want to optimize this away, it can be done later at code generation time.
-
-    override fun after(gosub: GoSub, parent: Node): Iterable<IAstModification> {
-        // if the next statement is return with no returnvalue, change into a regular jump if there are no parameters as well.
-        val subroutineParams = gosub.identifier.targetSubroutine(program)?.parameters
-        if(subroutineParams!=null && subroutineParams.isEmpty()) {
-            val returnstmt = gosub.nextSibling() as? Return
-            if(returnstmt!=null && returnstmt.value==null) {
-                return listOf(
-                    IAstModification.Remove(returnstmt, parent as IStatementContainer),
-                    IAstModification.ReplaceNode(gosub, Jump(null, gosub.identifier, null, gosub.position), parent)
-                )
-            }
-        }
-        return noModifications
-    }
-
     override fun before(assignment: Assignment, parent: Node): Iterable<IAstModification> {
 
         val binExpr = assignment.value as? BinaryExpression
@@ -429,31 +385,22 @@ class StatementOptimizer(private val program: Program,
         if(compTarget.name==VMTarget.NAME)
             return noModifications
 
-        fun returnViaIntermediaryVar(value: Expression): Iterable<IAstModification>? {
+        val returnvalue = returnStmt.value
-            val subr = returnStmt.definingSubroutine!!
+        if (returnvalue!=null) {
-            val returnDt = subr.returntypes.single()
+            val dt = returnvalue.inferType(program).getOr(DataType.UNDEFINED)
-            if (returnDt in IntegerDatatypes) {
+            if(dt!=DataType.UNDEFINED) {
+                if (returnvalue is BinaryExpression || (returnvalue is TypecastExpression && !returnvalue.expression.isSimple)) {
                     // first assign to intermediary variable, then return that
-                val (returnVarName, _) = program.getTempVar(returnDt)
+                    val (returnVarName, _) = program.getTempVar(dt)
                     val returnValueIntermediary = IdentifierReference(returnVarName, returnStmt.position)
                     val tgt = AssignTarget(returnValueIntermediary, null, null, returnStmt.position)
-                val assign = Assignment(tgt, value, AssignmentOrigin.OPTIMIZER, returnStmt.position)
+                    val assign = Assignment(tgt, returnvalue, AssignmentOrigin.OPTIMIZER, returnStmt.position)
                     val returnReplacement = Return(returnValueIntermediary.copy(), returnStmt.position)
                     return listOf(
                         IAstModification.InsertBefore(returnStmt, assign, parent as IStatementContainer),
                         IAstModification.ReplaceNode(returnStmt, returnReplacement, parent)
                     )
                 }
-            return null
-        }
-
-        // TODO decision when to use intermediary variable to calculate returnvalue seems a bit arbitrary...
-        val returnvalue = returnStmt.value
-        if (returnvalue!=null) {
-            if (returnvalue is BinaryExpression || (returnvalue is TypecastExpression && !returnvalue.expression.isSimple)) {
-                val mod = returnViaIntermediaryVar(returnvalue)
-                if(mod!=null)
-                    return mod
             }
         }
 

compiler/build.gradle

@@ -27,7 +27,6 @@ compileTestKotlin {
 def prog8version = rootProject.file('compiler/res/version.txt').text.trim()
 
 dependencies {
-    implementation project(':codeAst')
     implementation project(':codeCore')
     implementation project(':codeOptimizers')
     implementation project(':compilerAst')
@@ -40,7 +39,7 @@ dependencies {
     implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.4'
     implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.16"
 
-    testImplementation 'io.kotest:kotest-runner-junit5-jvm:5.2.3'
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:5.3.2'
 }
 
 configurations.all {
@@ -68,7 +67,6 @@ sourceSets {
     test {
         java {
             srcDir "${project.projectDir}/test"
-            srcDir "${project(':compilerAst').projectDir}/test/helpers"
         }
     }
 }

compiler/compiler.iml

@@ -17,7 +17,6 @@
     <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
     <orderEntry type="library" name="antlr.antlr4" level="project" />
     <orderEntry type="module" module-name="codeCore" />
-    <orderEntry type="module" module-name="codeAst" />
     <orderEntry type="module" module-name="compilerAst" />
     <orderEntry type="module" module-name="codeOptimizers" />
     <orderEntry type="module" module-name="codeGenCpu6502" />

compiler/res/prog8lib/c128/syslib.p8

@@ -722,6 +722,7 @@ cx16 {
     ; $1300-$1bff is unused RAM on C128. We'll use $1a00-$1bff as the lo/hi evalstack.
     ; the virtual registers are allocated at the bottom of the eval-stack (should be ample space unless
     ; you're doing insane nesting of expressions...)
+    ; NOTE: the memory location of these registers can change based on the "-esa" compiler option
     &uword r0  = $1b00
     &uword r1  = $1b02
     &uword r2  = $1b04

compiler/res/prog8lib/c64/graphics.p8

@@ -315,7 +315,7 @@ hline_zero2
     ; for efficiency of internal algorithms here is the internal plot routine
     ; that takes the plotx coordinate in a separate variable instead of the XY register pair:
 
-    uword internal_plotx     ; 0..319        ; separate 'parameter' for internal_plot()
+    uword @zp internal_plotx     ; 0..319        ; separate 'parameter' for internal_plot()
 
     asmsub  internal_plot(ubyte ploty @A) clobbers (A, X, Y) {      ; internal_plotx is 16 bits 0 to 319... doesn't fit in a register
         %asm {{

compiler/res/prog8lib/c64/syslib.p8

@@ -685,6 +685,7 @@ cx16 {
     ; (because there's no room for them in the zeropage)
     ; they are allocated at the bottom of the eval-stack (should be ample space unless
     ; you're doing insane nesting of expressions...)
+    ; NOTE: the memory location of these registers can change based on the "-esa" compiler option
     &uword r0  = $cf00
     &uword r1  = $cf02
     &uword r2  = $cf04

compiler/res/prog8lib/conv.p8

@@ -416,6 +416,9 @@ _loop
 	beq  _stop
 	cmp  #7                 ; screencode letters A-F are 1-6
 	bcc  _add_letter
+	and  #127
+	cmp  #97
+	bcs  _try_iso            ; maybe letter is iso:'a'-iso:'f' (97-102)
 	cmp  #'g'
 	bcs  _stop
 	cmp  #'a'
@@ -451,6 +454,11 @@ _add_letter
 	sta  P8ZP_SCRATCH_B1
 	pla
 	jmp  _calc
+_try_iso
+        cmp  #103
+        bcs  _stop
+        and  #63
+        bne  _add_letter
 	}}
 }
 

compiler/res/prog8lib/cx16/cx16diskio.p8

@@ -102,6 +102,8 @@ cx16diskio {
                 goto byte_read_loop     ; macptr block read not supported, do fallback loop
             diskio.list_blocks += size
             bufferpointer += size
+            if msb(bufferpointer) == $c0
+                bufferpointer = mkword($a0, lsb(bufferpointer))  ; wrap over bank boundary
             num_bytes -= size
             if c64.READST() & $40 {
                 diskio.f_close()       ; end of file, close it

compiler/res/prog8lib/cx16/gfx2.p8

@@ -28,7 +28,7 @@ gfx2 {
     uword width = 0
     uword height = 0
     ubyte bpp = 0
-    ubyte monochrome_dont_stipple_flag = false            ; set to false to enable stippling mode in monochrome displaymodes
+    bool monochrome_dont_stipple_flag = false            ; set to false to enable stippling mode in monochrome displaymodes
 
     sub screen_mode(ubyte mode) {
         when mode {
@@ -127,7 +127,7 @@ gfx2 {
         position(0, 0)
     }
 
-    sub monochrome_stipple(ubyte enable) {
+    sub monochrome_stipple(bool enable) {
         monochrome_dont_stipple_flag = not enable
     }
 
@@ -683,7 +683,7 @@ _done
         }
     }
 
-    sub position2(uword @zp x, uword y, ubyte also_port_1) {
+    sub position2(uword @zp x, uword y, bool also_port_1) {
         position(x, y)
         if also_port_1 {
             when active_mode {
@@ -844,25 +844,28 @@ _done
             }
             6 -> {
                 ; hires 4c
+                ; we're going to use a few cx16 registers to make sure every variable is in zeropage in the inner loop.
+                cx16.r11L = color
+                cx16.r8 = y
                 while @(sctextptr) {
                     chardataptr = charset_addr + (@(sctextptr) as uword)*8
                     repeat 8 {
                         ; TODO rewrite this inner loop partly in assembly
                         ;      requires expanding the charbits to 2-bits per pixel (based on color)
                         ;      also it's way more efficient to draw whole horizontal spans instead of per-character
-                        ubyte charbits = cx16.vpeek(charset_bank, chardataptr)
+                        cx16.r9L = cx16.vpeek(charset_bank, chardataptr)  ; get the 8 horizontal character bits
+                        cx16.r7 = x
                         repeat 8 {
-                            charbits <<= 1
+                            cx16.r9L <<= 1
                             if_cs
-                                plot(x, y, color)
+                                plot(cx16.r7, cx16.r8, cx16.r11L)
-                            x++
+                            cx16.r7++
                         }
-                        x-=8
                         chardataptr++
-                        y++
+                        cx16.r8++
                     }
                     x+=8
-                    y-=8
+                    cx16.r8-=8
                     sctextptr++
                 }
             }

compiler/res/prog8lib/cx16/graphics.p8

@@ -2,15 +2,20 @@
 %import textio
 
 ; Bitmap pixel graphics module for the CommanderX16
-; wraps the graphics functions that are in ROM.
+; Wraps the graphics functions that are in ROM.
-; only black/white monochrome 320x200 for now. (i.e. truncated at the bottom)
+; Only lo-res 320x240 256 color mode for now.
-; For full-screen 640x480 or 320x240 graphics, use the "gfx2" module instead. (but that is Cx16-specific)
+; Unlike graphics module on the C64, you can use colors() to set new drawing colors for every draw operation.
+; For other resolutions or other color modes, use the "gfx2" module instead. (which is Cx16-specific)
 ; Note: there is no color palette manipulation here, you have to do that yourself or use the "palette" module.
 
 
 graphics {
     const uword WIDTH = 320
-    const ubyte HEIGHT = 200
+    const ubyte HEIGHT = 240
+
+
+    ubyte stroke_color = 1
+    ubyte background_color = 0
 
     sub enable_bitmap_mode() {
         ; enable bitmap screen, erase it and set colors to black/white.
@@ -27,10 +32,18 @@ graphics {
 
 
     sub clear_screen(ubyte pixelcolor, ubyte bgcolor) {
+        stroke_color = pixelcolor
+        background_color = bgcolor
         cx16.GRAPH_set_colors(pixelcolor, pixelcolor, bgcolor)
         cx16.GRAPH_clear()
     }
 
+    sub colors(ubyte stroke, ubyte fill) {
+        ; this routine is only available on the cx16, other targets can't change colors on the fly
+        cx16.GRAPH_set_colors(stroke, fill, background_color)
+        stroke_color = stroke
+    }
+
     sub line(uword @zp x1, ubyte @zp y1, uword @zp x2, ubyte @zp y2) {
         cx16.GRAPH_draw_line(x1, y1, x2, y2)
     }
@@ -71,31 +84,31 @@ graphics {
             cx16.r0 = xcenter + xx
             cx16.r1 = ycenter + yy
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter - xx
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter + xx
             cx16.r1 = ycenter - yy
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter - xx
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter + yy
             cx16.r1 = ycenter + xx
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter - yy
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter + yy
             cx16.r1 = ycenter - xx
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             cx16.r0 = xcenter - yy
             cx16.FB_cursor_position2()
-            cx16.FB_set_pixel(1)
+            cx16.FB_set_pixel(stroke_color)
             yy++
             if decisionOver2<=0 {
                 decisionOver2 += (yy as word)*2+1

compiler/res/prog8lib/cx16/psg.p8

@@ -0,0 +1,176 @@
+%import syslib
+
+psg {
+    ; $1F9C0 - $1F9FF 	16 blocks of 4 PSG registers (16 voices)
+    ; 00  frequency word LSB
+    ; 01  frequency word MSB.    freqword = HERZ / 0.3725290298461914
+    ; 02  bit 7 =right, bit 6 = left, bits 5-0 = volume 0-63 levels
+    ; 03  bit 7,6 = waveform, bits 5-0 = Pulse width 0-63
+    ; waveform: 0=pulse, 1=sawtooth, 2=triangle, 3=noise
+    const ubyte PULSE    = %00000000
+    const ubyte SAWTOOTH = %01000000
+    const ubyte TRIANGLE = %10000000
+    const ubyte NOISE    = %11000000
+    const ubyte LEFT     = %01000000
+    const ubyte RIGHT    = %10000000
+
+    sub voice(ubyte voice_num, ubyte channel, ubyte volume, ubyte waveform, ubyte pulsewidth) {
+        ; -- Enables a 'voice' on the PSG.
+        ;    voice_num = 0-15, the voice number.
+        ;    channel = either LEFT or RIGHT or (LEFT|RIGHT). Specifies the stereo channel(s) to use.
+        ;    volume = 0-63, the starting volume for the voice
+        ;    waveform = one of PULSE,SAWTOOTH,TRIANGLE,NOISE.
+        ;    pulsewidth = 0-63.  Specifies the pulse width for waveform=PULSE.
+        envelope_states[voice_num] = 255
+        cx16.r0 = $f9c2 + voice_num * 4
+        cx16.VERA_CTRL = 0
+        cx16.VERA_ADDR_L = lsb(cx16.r0)
+        cx16.VERA_ADDR_M = msb(cx16.r0)
+        cx16.VERA_ADDR_H = 1
+        cx16.VERA_DATA0 = channel | volume
+        cx16.VERA_ADDR_L++
+        cx16.VERA_DATA0 = waveform | pulsewidth
+        envelope_volumes[voice_num] = mkword(volume, 0)
+        envelope_maxvolumes[voice_num] = volume
+    }
+
+;    sub freq_hz(ubyte voice_num, float hertz) {
+;        ; this would rely on floating point math to convert hertz to vera frequency
+;        ; could be replaced by integer math maybe with a lookup table?
+;        uword vera_freq = (hertz / 0.3725290298461914) as uword
+;        freq(voice_num, vera_freq)
+;    }
+
+    sub freq(ubyte voice_num, uword vera_freq) {
+        ; -- Changes the frequency of the voice's sound.
+        ;    voice_num = 0-15,  vera_freq = 0-65535  calculate this via the formula given in the Vera's PSG documentation.
+        ;    (https://github.com/commanderx16/x16-docs/blob/master/VERA%20Programmer's%20Reference.md)
+        cx16.r0 = $f9c0 + voice_num * 4
+        cx16.VERA_CTRL = 0
+        cx16.VERA_ADDR_L = lsb(cx16.r0)
+        cx16.VERA_ADDR_M = msb(cx16.r0)
+        cx16.VERA_ADDR_H = 1
+        cx16.VERA_DATA0 = lsb(vera_freq)
+        cx16.VERA_ADDR_L++
+        cx16.VERA_DATA0 = msb(vera_freq)
+    }
+
+    sub volume(ubyte voice_num, ubyte vol) {
+        ; -- Modifies the volume of this voice.
+        ;    voice_num = 0-15, vol = 0-63 where 0=silent, 63=loudest.
+        cx16.r0 = $f9c2 + voice_num * 4
+        cx16.vpoke(1, cx16.r0, cx16.vpeek(1, cx16.r0) & %11000000 | vol)
+        envelope_volumes[voice_num] = mkword(vol, 0)
+        envelope_maxvolumes[voice_num] = vol
+    }
+
+    sub pulse_width(ubyte voice_num, ubyte pw) {
+        ; -- Modifies the pulse width of this voice (when waveform=PULSE)
+        ;    voice_num = 0-15, pw = 0-63  where 0=narrow, 63=50%cycle so square wave.
+        cx16.r0 = $f9c3 + voice_num * 4
+        cx16.vpoke(1, cx16.r0, cx16.vpeek(1, cx16.r0) & %11000000 | pw)
+    }
+
+    sub envelope(ubyte voice_num, ubyte maxvolume, ubyte attack, ubyte sustain, ubyte release) {
+        ; -- Enables AttackSustainRelease volume envelope for a voice.
+        ;    Note: this requires setting up envelopes_irq() as well, read its description.
+        ;    voice_num = 0-15   maxvolume = 0-63
+        ;    attack, sustain, release = 0-255 that determine the speed of the A/D/R.
+        ;    TODO describe how the speeds are calculated. For now, experiment. Higher values means *slower* enveloping.
+        envelope_states[voice_num] = 255
+        envelope_attacks[voice_num] = attack
+        envelope_sustains[voice_num] = sustain
+        envelope_releases[voice_num] = release
+        if attack
+            attack = 0
+        else
+            attack = maxvolume     ; max volume when no attack is set
+        envelope_volumes[voice_num] = mkword(attack, 0)
+        envelope_maxvolumes[voice_num] = maxvolume
+        envelope_states[voice_num] = 0
+    }
+
+    sub silent() {
+        ; -- Shut down all PSG voices.
+        for cx16.r1L in 0 to 15 {
+            envelope_states[cx16.r1L] = 255
+            envelope_volumes[cx16.r1L] = 0
+            volume(cx16.r1L, 0)
+        }
+    }
+
+    sub envelopes_irq() {
+        ; If you want to use real-time volume envelopes (Attack-Sustain-Release),
+        ; you have to call this routine every 1/60th second, for example from your vsync irq handler,
+        ; or just install this routine as the only irq handler if you don't have to do other things there.
+        ; Example: cx16.set_irq(&psg.envelopes_irq, true)
+
+        ; cx16.r0 = the volume word (volume scaled by 256)
+        ; cx16.r1L = the voice number
+        ; cx16.r2L = attack value
+
+        pushw(cx16.r0)
+        push(cx16.r1L)
+        push(cx16.r2L)
+        pushw(cx16.r9)
+        ; calculate new volumes
+        for cx16.r1L in 0 to 15 {
+            when envelope_states[cx16.r1L] {
+                0 -> {
+                    ; attack
+                    cx16.r2L = envelope_maxvolumes[cx16.r1L]
+                    cx16.r0 = envelope_volumes[cx16.r1L] + envelope_attacks[cx16.r1L] * $0040
+                    if msb(cx16.r0) > cx16.r2L or envelope_attacks[cx16.r1L]==0 {
+                        cx16.r0 = mkword(cx16.r2L, 0)
+                        envelope_attacks[cx16.r1L] = 0
+                        envelope_states[cx16.r1L] = 1  ; start sustain
+                    }
+                    envelope_volumes[cx16.r1L] = cx16.r0
+                }
+                1 -> {
+                    ; sustain
+                    if envelope_sustains[cx16.r1L] {
+                        envelope_sustains[cx16.r1L]--
+                    } else {
+                        envelope_states[cx16.r1L] = 2  ; start release
+                    }
+                }
+                2 -> {
+                    ; release
+                    cx16.r0 = envelope_volumes[cx16.r1L] - envelope_releases[cx16.r1L] * $0040
+                    if msb(cx16.r0) & %11000000 {
+                        cx16.r0 = 0
+                        envelope_releases[cx16.r1L] = 0
+                    }
+                    envelope_volumes[cx16.r1L] = cx16.r0
+                }
+            }
+        }
+
+        ; set new volumes of all 16 voices, using vera stride of 4
+        cx16.push_vera_context()
+        cx16.VERA_CTRL = 0
+        cx16.VERA_ADDR_L = $c2
+        cx16.VERA_ADDR_M = $f9
+        cx16.VERA_ADDR_H = 1 | %00110000
+        cx16.VERA_CTRL = 1
+        cx16.VERA_ADDR_L = $c2
+        cx16.VERA_ADDR_M = $f9
+        cx16.VERA_ADDR_H = 1 | %00110000
+        for cx16.r1L in 0 to 15 {
+            cx16.VERA_DATA0 = cx16.VERA_DATA1 & %11000000 | msb(envelope_volumes[cx16.r1L])
+        }
+        cx16.pop_vera_context()
+        popw(cx16.r9)
+        pop(cx16.r2L)
+        pop(cx16.r1L)
+        popw(cx16.r0)
+    }
+
+    ubyte[16] envelope_states
+    uword[16] envelope_volumes      ; scaled by 256
+    ubyte[16] envelope_attacks
+    ubyte[16] envelope_sustains
+    ubyte[16] envelope_releases
+    ubyte[16] envelope_maxvolumes
+}

compiler/res/prog8lib/cx16/syslib.p8

@@ -98,7 +98,7 @@ cx16 {
     &uword  ISTOP           = $0328
     &uword  IGETIN          = $032a
     &uword  ICLALL          = $032c
-    &uword  KEYHDL          = $032e     ; keyboard scan code handler
+    &uword  KEYHDL          = $032e     ; keyboard scan code handler see examples/cx16/keyboardhandler.p8
     &uword  ILOAD           = $0330
     &uword  ISAVE           = $0332
     &uword  NMI_VEC         = $FFFA     ; 65c02 nmi vector, determined by the kernal if banked in
@@ -306,7 +306,7 @@ romsub $ff5c = lkupsa(ubyte sa @Y)  clobbers(A,X,Y)
 romsub $ff5f = screen_mode(ubyte mode @A, ubyte getCurrent @Pc)  clobbers(A, X, Y) -> ubyte @Pc
 romsub $ff62 = screen_set_charset(ubyte charset @A, uword charsetptr @XY)  clobbers(A,X,Y)      ; incompatible with C128  dlchr()
 ; not yet supported: romsub $ff65 = pfkey()  clobbers(A,X,Y)
-romsub $ff6e = jsrfar()
+romsub $ff6e = jsrfar()  ; following word = address to call, byte after that=rom/ram bank it is in
 romsub $ff74 = fetch(ubyte bank @X, ubyte index @Y)  clobbers(X) -> ubyte @A
 romsub $ff77 = stash(ubyte data @A, ubyte bank @X, ubyte index @Y)  clobbers(X)
 romsub $ff7a = cmpare(ubyte data @A, ubyte bank @X, ubyte index @Y)  clobbers(X)
@@ -369,6 +369,7 @@ romsub $ff4d = clock_set_date_time(uword yearmonth @R0, uword dayhours @R1, uwor
 romsub $ff50 = clock_get_date_time()  clobbers(A, X, Y)  -> uword @R0, uword @R1, uword @R2, ubyte @R3   ; result registers see clock_set_date_time()
 
 ; keyboard, mouse, joystick
+; note: also see the kbdbuf_clear() helper routine below!
 romsub $febd = kbdbuf_peek() -> ubyte @A, ubyte @X     ; key in A, queue length in X
 romsub $febd = kbdbuf_peek2() -> uword @AX             ; alternative to above to not have the hassle to deal with multiple return values
 romsub $fec0 = kbdbuf_get_modifiers() -> ubyte @A
@@ -380,6 +381,15 @@ romsub $ff53 = joystick_scan()  clobbers(A, X, Y)
 romsub $ff56 = joystick_get(ubyte joynr @A) -> ubyte @A, ubyte @X, ubyte @Y
 romsub $ff56 = joystick_get2(ubyte joynr @A) clobbers(Y) -> uword @AX   ; alternative to above to not have the hassle to deal with multiple return values
 
+asmsub kbdbuf_clear() {
+    ; -- convenience helper routine to clear the keyboard buffer
+    %asm {{
+-       jsr  c64.GETIN
+        bne  -
+        rts
+    }}
+}
+
 asmsub mouse_config2(ubyte shape @A) clobbers (A, X, Y) {
     ; -- convenience wrapper function that handles the screen resolution for mouse_config() for you
     %asm {{
@@ -639,8 +649,12 @@ asmsub  init_system_phase2()  {
 
 asmsub  cleanup_at_exit() {
     ; executed when the main subroutine does rts
-    ; just an rts here, nothing special to clean up on cx16
     %asm {{
+        lda  #1
+        sta  $00        ; ram bank 1
+        lda  #4
+        sta  $01        ; rom bank 4 (kernal)
+        stz  $2d        ; hack to reset machine code monitor bank to 0
         rts
     }}
 }
@@ -731,6 +745,56 @@ IRQ_SCRATCH_ZPWORD2	.word  0
 		}}
 }
 
+asmsub push_vera_context() clobbers(A) {
+    ; -- use this at the start of your IRQ handler if it uses Vera registers, to save the state
+    %asm {{
+        ; note cannot store this on cpu hardware stack because this gets called as a subroutine
+        lda  cx16.VERA_ADDR_L
+        sta  _vera_storage
+        lda  cx16.VERA_ADDR_M
+        sta  _vera_storage+1
+        lda  cx16.VERA_ADDR_H
+        sta  _vera_storage+2
+        lda  cx16.VERA_CTRL
+        sta  _vera_storage+3
+        eor  #1
+        sta  cx16.VERA_CTRL
+        lda  cx16.VERA_ADDR_L
+        sta  _vera_storage+4
+        lda  cx16.VERA_ADDR_M
+        sta  _vera_storage+5
+        lda  cx16.VERA_ADDR_H
+        sta  _vera_storage+6
+        lda  cx16.VERA_CTRL
+        sta  _vera_storage+7
+        rts
+_vera_storage:  .byte 0,0,0,0,0,0,0,0
+    }}
+}
+
+asmsub pop_vera_context() clobbers(A) {
+    ; -- use this at the end of your IRQ handler if it uses Vera registers, to restore the state
+    %asm {{
+        lda  cx16.push_vera_context._vera_storage+7
+        sta  cx16.VERA_CTRL
+        lda  cx16.push_vera_context._vera_storage+6
+        sta  cx16.VERA_ADDR_H
+        lda  cx16.push_vera_context._vera_storage+5
+        sta  cx16.VERA_ADDR_M
+        lda  cx16.push_vera_context._vera_storage+4
+        sta  cx16.VERA_ADDR_L
+        lda  cx16.push_vera_context._vera_storage+3
+        sta  cx16.VERA_CTRL
+        lda  cx16.push_vera_context._vera_storage+2
+        sta  cx16.VERA_ADDR_H
+        lda  cx16.push_vera_context._vera_storage+1
+        sta  cx16.VERA_ADDR_M
+        lda  cx16.push_vera_context._vera_storage+0
+        sta  cx16.VERA_ADDR_L
+        rts
+    }}
+}
+
 
 asmsub  restore_irq() clobbers(A) {
 	%asm {{
@@ -815,6 +879,8 @@ sys {
         %asm {{
             sei
             stz  $01                        ; bank the kernal in
+            lda  #$80
+            sta  cx16.VERA_CTRL             ; reset Vera (kernal doesn't do this?)
             jmp  (cx16.RESET_VEC)
         }}
     }

compiler/res/prog8lib/diskio.p8

@@ -6,11 +6,12 @@
 
 diskio {
 
-    sub directory(ubyte drivenumber) -> ubyte {
+    sub directory(ubyte drivenumber) -> bool {
         ; -- Prints the directory contents of disk drive 8-11 to the screen. Returns success.
 
         c64.SETNAM(1, "$")
         c64.SETLFS(13, drivenumber, 0)
+        ubyte status = 1
         void c64.OPEN()          ; open 13,8,0,"$"
         if_cs
             goto io_error
@@ -23,8 +24,13 @@ diskio {
         }
 
         ; while not key pressed / EOF encountered, read data.
-        ubyte status = c64.READST()
+        status = c64.READST()
-        while not status {
+        if status!=0 {
+            status = 1
+            goto io_error
+        }
+
+        while status==0 {
             ubyte low = c64.CHRIN()
             ubyte high = c64.CHRIN()
             txt.print_uw(mkword(high, low))
@@ -43,9 +49,9 @@ diskio {
             if c64.STOP2()
                 break
         }
+        status = c64.READST()
 
 io_error:
-        status = c64.READST()
         c64.CLRCHN()        ; restore default i/o devices
         c64.CLOSE(13)
 
@@ -59,34 +65,69 @@ io_error:
         return true
     }
 
+    sub diskname(ubyte drivenumber) -> uword {
+        ; -- Returns pointer to disk name string or 0 if failure.
+
+        c64.SETNAM(1, "$")
+        c64.SETLFS(13, drivenumber, 0)
+        ubyte okay = false
+        void c64.OPEN()          ; open 13,8,0,"$"
+        if_cs
+            goto io_error
+        void c64.CHKIN(13)        ; use #13 as input channel
+        if_cs
+            goto io_error
+
+        repeat 6 {
+            void c64.CHRIN()     ; skip the 6 prologue bytes
+        }
+        if c64.READST()!=0
+            goto io_error
+
+        ; while not key pressed / EOF encountered, read data.
+        cx16.r0 = &list_filename
+        repeat {
+            @(cx16.r0) = c64.CHRIN()
+            if @(cx16.r0)==0
+                break
+            cx16.r0++
+        }
+        okay = true
+
+io_error:
+        c64.CLRCHN()        ; restore default i/o devices
+        c64.CLOSE(13)
+        if okay
+            return &list_filename
+        return 0
+    }
 
     ; internal variables for the iterative file lister / loader
-    ubyte list_skip_disk_name
+    bool list_skip_disk_name
     uword list_pattern
     uword list_blocks
-    ubyte iteration_in_progress = false
+    bool iteration_in_progress = false
     ubyte @zp first_byte
-    ubyte have_first_byte
+    bool have_first_byte
-    str   list_filename = "?" * 32
+    str list_filename = "?" * 50
-
 
     ; ----- get a list of files (uses iteration functions internally) -----
 
     sub list_files(ubyte drivenumber, uword pattern_ptr, uword name_ptrs, ubyte max_names) -> ubyte {
-        ; -- fill the array 'name_ptrs' with (pointers to) the names of the files requested.
+        ; -- fill the array 'name_ptrs' with (pointers to) the names of the files requested. Returns number of files.
-        const uword names_buf_size = 800
+        const uword filenames_buf_size = 800
-        uword names_buffer = memory("filenames", names_buf_size, 0)
+        uword filenames_buffer = memory("filenames", filenames_buf_size, 0)
-        uword buffer_start = names_buffer
+        uword buffer_start = filenames_buffer
         ubyte files_found = 0
         if lf_start_list(drivenumber, pattern_ptr) {
             while lf_next_entry() {
-                @(name_ptrs) = lsb(names_buffer)
+                @(name_ptrs) = lsb(filenames_buffer)
                 name_ptrs++
-                @(name_ptrs) = msb(names_buffer)
+                @(name_ptrs) = msb(filenames_buffer)
                 name_ptrs++
-                names_buffer += string.copy(diskio.list_filename, names_buffer) + 1
+                filenames_buffer += string.copy(diskio.list_filename, filenames_buffer) + 1
                 files_found++
-                if names_buffer - buffer_start > names_buf_size-18
+                if filenames_buffer - buffer_start > filenames_buf_size-18
                     break
                 if files_found == max_names
                     break
@@ -98,7 +139,7 @@ io_error:
 
     ; ----- iterative file lister functions (uses io channel 12) -----
 
-    sub lf_start_list(ubyte drivenumber, uword pattern_ptr) -> ubyte {
+    sub lf_start_list(ubyte drivenumber, uword pattern_ptr) -> bool {
         ; -- start an iterative file listing with optional pattern matching.
         ;    note: only a single iteration loop can be active at a time!
         lf_end_list()
@@ -127,7 +168,7 @@ io_error:
         return false
     }
 
-    sub lf_next_entry() -> ubyte {
+    sub lf_next_entry() -> bool {
         ; -- retrieve the next entry from an iterative file listing session.
         ;    results will be found in list_blocks and list_filename.
         ;    if it returns false though, there are no more entries (or an error occurred).
@@ -199,7 +240,7 @@ close_end:
 
     ; ----- iterative file loader functions (uses io channel 11) -----
 
-    sub f_open(ubyte drivenumber, uword filenameptr) -> ubyte {
+    sub f_open(ubyte drivenumber, uword filenameptr) -> bool {
         ; -- open a file for iterative reading with f_read
         ;    note: only a single iteration loop can be active at a time!
         f_close()
@@ -208,6 +249,7 @@ close_end:
         c64.SETLFS(11, drivenumber, 0)
         void c64.OPEN()          ; open 11,8,0,"filename"
         if_cc {
+            if c64.READST()==0 {
                 iteration_in_progress = true
                 have_first_byte = false
                 void c64.CHKIN(11)        ; use #11 as input channel
@@ -219,6 +261,7 @@ close_end:
                     }
                 }
             }
+        }
         f_close()
         return false
     }
@@ -226,6 +269,8 @@ close_end:
     sub f_read(uword bufferpointer, uword num_bytes) -> uword {
         ; -- read from the currently open file, up to the given number of bytes.
         ;    returns the actual number of bytes read.  (checks for End-of-file and error conditions)
+        ;    NOTE: on systems with banked ram (such as Commander X16) this routine DOES NOT
+        ;          automatically load into subsequent banks if it reaches a bank boundary!
         if not iteration_in_progress or not num_bytes
             return 0
 
@@ -341,7 +386,7 @@ _end        rts
 
     ; ----- iterative file saver functions (uses io channel 14) -----
 
-    sub f_open_w(ubyte drivenumber, uword filenameptr) -> ubyte {
+    sub f_open_w(ubyte drivenumber, uword filenameptr) -> bool {
         ; -- open a file for iterative writing with f_write
         f_close_w()
 
@@ -356,7 +401,7 @@ _end        rts
         return false
     }
 
-    sub f_write(uword bufferpointer, uword num_bytes) -> ubyte {
+    sub f_write(uword bufferpointer, uword num_bytes) -> bool {
         ; -- write the given umber of bytes to the currently open file
         if num_bytes!=0 {
             void c64.CHKOUT(14)        ; use #14 as input channel again
@@ -380,8 +425,8 @@ _end        rts
 
     sub status(ubyte drivenumber) -> uword {
         ; -- retrieve the disk drive's current status message
-        uword messageptr = &filename
+        uword messageptr = &list_filename
-        c64.SETNAM(0, filename)
+        c64.SETNAM(0, list_filename)
         c64.SETLFS(15, drivenumber, 15)
         void c64.OPEN()          ; open 15,8,15
         if_cs
@@ -391,22 +436,25 @@ _end        rts
             goto io_error
 
         while not c64.READST() {
-            @(messageptr) = c64.CHRIN()
+            first_byte = c64.CHRIN()
+            if first_byte=='\r' or first_byte=='\n'
+                break
+            @(messageptr) = first_byte
             messageptr++
         }
-
         @(messageptr) = 0
+
 done:
         c64.CLRCHN()        ; restore default i/o devices
         c64.CLOSE(15)
-        return filename
+        return list_filename
 
 io_error:
-        filename = "?disk error"
+        list_filename = "?disk error"
         goto done
     }
 
-    sub save(ubyte drivenumber, uword filenameptr, uword address, uword size) -> ubyte {
+    sub save(ubyte drivenumber, uword filenameptr, uword address, uword size) -> bool {
         c64.SETNAM(string.length(filenameptr), filenameptr)
         c64.SETLFS(1, drivenumber, 0)
         uword @shared end_address = address + size
@@ -476,7 +524,7 @@ io_error:
 
     ; Internal routine, only to be used on Commander X16 platform if headerless=true,
     ; because this routine uses kernal support for that to load headerless files.
-    sub load_headerless_cx16(ubyte drivenumber, uword filenameptr, uword address_override, ubyte headerless) -> uword {
+    sub load_headerless_cx16(ubyte drivenumber, uword filenameptr, uword address_override, bool headerless) -> uword {
         c64.SETNAM(string.length(filenameptr), filenameptr)
         ubyte secondary = 1
         cx16.r1 = 0
@@ -504,10 +552,10 @@ io_error:
 
     sub delete(ubyte drivenumber, uword filenameptr) {
         ; -- delete a file on the drive
-        filename[0] = 's'
+        list_filename[0] = 's'
-        filename[1] = ':'
+        list_filename[1] = ':'
-        ubyte flen = string.copy(filenameptr, &filename+2)
+        ubyte flen = string.copy(filenameptr, &list_filename+2)
-        c64.SETNAM(flen+2, filename)
+        c64.SETNAM(flen+2, list_filename)
         c64.SETLFS(1, drivenumber, 15)
         void c64.OPEN()
         c64.CLRCHN()
@@ -516,17 +564,24 @@ io_error:
 
     sub rename(ubyte drivenumber, uword oldfileptr, uword newfileptr) {
         ; -- rename a file on the drive
-        filename[0] = 'r'
+        list_filename[0] = 'r'
-        filename[1] = ':'
+        list_filename[1] = ':'
-        ubyte flen_new = string.copy(newfileptr, &filename+2)
+        ubyte flen_new = string.copy(newfileptr, &list_filename+2)
-        filename[flen_new+2] = '='
+        list_filename[flen_new+2] = '='
-        ubyte flen_old = string.copy(oldfileptr, &filename+3+flen_new)
+        ubyte flen_old = string.copy(oldfileptr, &list_filename+3+flen_new)
-        c64.SETNAM(3+flen_new+flen_old, filename)
+        c64.SETNAM(3+flen_new+flen_old, list_filename)
         c64.SETLFS(1, drivenumber, 15)
         void c64.OPEN()
         c64.CLRCHN()
         c64.CLOSE(1)
     }
 
-    str filename = "0:??????????????????????????????????????"
+    sub send_command(ubyte drivenumber, uword commandptr) {
+        ; -- send a dos command to the drive
+        c64.SETNAM(string.length(commandptr), commandptr)
+        c64.SETLFS(15, drivenumber, 15)
+        void c64.OPEN()
+        c64.CLRCHN()
+        c64.CLOSE(15)
+    }
 }

compiler/res/prog8lib/math.p8

@@ -37,60 +37,6 @@ _sinecos8	.char  trunc(127.0 * sin(range(256+64) * rad(360.0/256.0)))
         }}
     }
 
-    asmsub sin16(ubyte angle @A) -> word @AY {
-        %asm {{
-		tay
-		lda  _sinecos8lo,y
-		pha
-		lda  _sinecos8hi,y
-		tay
-		pla
-		rts
-_  :=  trunc(32767.0 * sin(range(256+64) * rad(360.0/256.0)))
-_sinecos8lo     .byte  <_
-_sinecos8hi     .byte  >_
-        }}
-    }
-
-    asmsub cos16(ubyte angle @A) -> word @AY {
-        %asm {{
-		tay
-		lda  sin16._sinecos8lo+64,y
-		pha
-		lda  sin16._sinecos8hi+64,y
-		tay
-		pla
-		rts
-        }}
-    }
-
-    asmsub sin16u(ubyte angle @A) -> uword @AY {
-        %asm {{
-		tay
-		lda  _sinecos8ulo,y
-		pha
-		lda  _sinecos8uhi,y
-		tay
-		pla
-		rts
-_  :=  trunc(32768.0 + 32767.5 * sin(range(256+64) * rad(360.0/256.0)))
-_sinecos8ulo     .byte  <_
-_sinecos8uhi     .byte  >_
-        }}
-    }
-
-    asmsub cos16u(ubyte angle @A) -> uword @AY {
-        %asm {{
-		tay
-		lda  sin16u._sinecos8ulo+64,y
-		pha
-		lda  sin16u._sinecos8uhi+64,y
-		tay
-		pla
-		rts
-        }}
-    }
-
     asmsub sinr8u(ubyte radians @A) clobbers(Y) -> ubyte @A {
         %asm {{
 		tay
@@ -125,57 +71,4 @@ _sinecosR8	.char  trunc(127.0 * sin(range(180+45) * rad(360.0/180.0)))
         }}
     }
 
-    asmsub sinr16(ubyte radians @A) -> word @AY {
-        %asm {{
-		tay
-		lda  _sinecosR8lo,y
-		pha
-		lda  _sinecosR8hi,y
-		tay
-		pla
-		rts
-_  :=  trunc(32767.0 * sin(range(180+45) * rad(360.0/180.0)))
-_sinecosR8lo     .byte  <_
-_sinecosR8hi     .byte  >_
-        }}
-    }
-
-    asmsub cosr16(ubyte radians @A) -> word @AY {
-        %asm {{
-		tay
-		lda  sinr16._sinecosR8lo+45,y
-		pha
-		lda  sinr16._sinecosR8hi+45,y
-		tay
-		pla
-		rts
-        }}
-    }
-
-    asmsub sinr16u(ubyte radians @A) -> uword @AY {
-        %asm {{
-		tay
-		lda  _sinecosR8ulo,y
-		pha
-		lda  _sinecosR8uhi,y
-		tay
-		pla
-		rts
-_  :=  trunc(32768.0 + 32767.5 * sin(range(180+45) * rad(360.0/180.0)))
-_sinecosR8ulo     .byte  <_
-_sinecosR8uhi     .byte  >_
-        }}
-    }
-
-    asmsub cosr16u(ubyte radians @A) -> uword @AY {
-        %asm {{
-		tay
-		lda  sinr16u._sinecosR8ulo+45,y
-		pha
-		lda  sinr16u._sinecosR8uhi+45,y
-		tay
-		pla
-		rts
-        }}
-    }
 }

compiler/res/prog8lib/prog8_funcs.asm

@@ -86,9 +86,9 @@ func_all_w_stack	.proc
 
 abs_b_stack	.proc
 	; -- push abs(A) on stack (as unsigned word)
-		jsr  abs_b_into_A
+		jsr  abs_b_into_AY
 		sta  P8ESTACK_LO,x
-		stz  p8ESTACK_HI,x
+		stz  P8ESTACK_HI,x
 		dex
 		rts
 		.pend

compiler/res/prog8lib/prog8_lib.asm

@@ -58,27 +58,6 @@ inv_word	.proc
 		rts
 		.pend
 
-not_byte	.proc
-		lda  P8ESTACK_LO+1,x
-		beq  +
-		lda  #1
-+		eor  #1
-		sta  P8ESTACK_LO+1,x
-		rts
-		.pend
-
-not_word	.proc
-		lda  P8ESTACK_LO + 1,x
-		ora  P8ESTACK_HI + 1,x
-		beq  +
-		lda  #1
-+		eor  #1
-		sta  P8ESTACK_LO + 1,x
-		lsr  a
-		sta  P8ESTACK_HI + 1,x
-		rts
-		.pend
-
 bitand_b	.proc
 		; -- bitwise and (of 2 bytes)
 		lda  P8ESTACK_LO+2,x
@@ -142,98 +121,6 @@ bitxor_w	.proc
 		rts
 		.pend
 
-and_b		.proc
-		; -- logical and (of 2 bytes)
-		lda  P8ESTACK_LO+2,x
-		beq  +
-		lda  #1
-+		sta  P8ZP_SCRATCH_B1
-		lda  P8ESTACK_LO+1,x
-		beq  +
-		lda  #1
-+		and  P8ZP_SCRATCH_B1
-		inx
-		sta  P8ESTACK_LO+1,x
-		rts
-		.pend
-
-or_b		.proc
-		; -- logical or (of 2 bytes)
-		lda  P8ESTACK_LO+2,x
-		ora  P8ESTACK_LO+1,x
-		beq  +
-		lda  #1
-+		inx
-		sta  P8ESTACK_LO+1,x
-		rts
-		.pend
-
-xor_b		.proc
-		; -- logical xor (of 2 bytes)
-		lda  P8ESTACK_LO+2,x
-		beq  +
-		lda  #1
-+		sta  P8ZP_SCRATCH_B1
-		lda  P8ESTACK_LO+1,x
-		beq  +
-		lda  #1
-+		eor  P8ZP_SCRATCH_B1
-		inx
-		sta  P8ESTACK_LO+1,x
-		rts
-		.pend
-
-and_w		.proc
-		; -- logical and (word and word -> byte)
-		lda  P8ESTACK_LO+2,x
-		ora  P8ESTACK_HI+2,x
-		beq  +
-		lda  #1
-+		sta  P8ZP_SCRATCH_B1
-		lda  P8ESTACK_LO+1,x
-		ora  P8ESTACK_HI+1,x
-		beq  +
-		lda  #1
-+		and  P8ZP_SCRATCH_B1
-		inx
- 		sta  P8ESTACK_LO+1,x
- 		sta  P8ESTACK_HI+1,x
-		rts
-		.pend
-
-or_w		.proc
-		; -- logical or (word or word -> byte)
-		lda  P8ESTACK_LO+2,x
-		ora  P8ESTACK_LO+1,x
-		ora  P8ESTACK_HI+2,x
-		ora  P8ESTACK_HI+1,x
-		beq  +
-		lda  #1
-+		inx
-		sta  P8ESTACK_LO+1,x
-		sta  P8ESTACK_HI+1,x
-		rts
-		.pend
-
-xor_w		.proc
-		; -- logical xor (word xor word -> byte)
-		lda  P8ESTACK_LO+2,x
-		ora  P8ESTACK_HI+2,x
-		beq  +
-		lda  #1
-+		sta  P8ZP_SCRATCH_B1
-		lda  P8ESTACK_LO+1,x
-		ora  P8ESTACK_HI+1,x
-		beq  +
-		lda  #1
-+		eor  P8ZP_SCRATCH_B1
-		inx
- 		sta  P8ESTACK_LO+1,x
- 		sta  P8ESTACK_HI+1,x
-		rts
-		.pend
-
-
 
 add_w		.proc
 	; -- push word+word / uword+uword
@@ -778,13 +665,10 @@ greaterequalzero_sb	.proc
 
 greaterequalzero_sw	.proc
 		lda  P8ESTACK_HI+1,x
+	    	bpl  equalzero_b._true
 	    	bmi  equalzero_b._false
-		ora  P8ESTACK_LO+1,x
-		beq  equalzero_b._true
-		bne  equalzero_b._false
 		.pend
 
-
 memcopy16_up	.proc
 	; -- copy memory UP from (P8ZP_SCRATCH_W1) to (P8ZP_SCRATCH_W2) of length X/Y (16-bit, X=lo, Y=hi)
 	;    clobbers register A,X,Y

compiler/res/prog8lib/string.p8

@@ -129,7 +129,7 @@ _startloop	dey
 
     asmsub find(uword string @R0, ubyte character @A) -> ubyte @A, ubyte @Pc {
         ; Locates the first position of the given character in the string,
-        ; returns Carry set if found + index in A, or Carry clear if not found.
+        ; returns Carry set if found + index in A, or A=0 + Carry clear if not found.
         %asm {{
                 ; need to copy the the cx16 virtual registers to zeropage to make this run on C64...
                 sta  P8ZP_SCRATCH_B1
@@ -144,7 +144,8 @@ _startloop	dey
 		beq  _found
 		iny
 		bne  -
-_notfound	clc
+_notfound	lda  #0
+                clc
 		rts
 _found		tya
                 sec
@@ -223,6 +224,26 @@ _done       rts
         }}
     }
 
+    sub startswith(str st, str prefix) -> bool {
+        ubyte prefix_len = length(prefix)
+        ubyte str_len = length(st)
+        if prefix_len > str_len
+            return false
+        cx16.r9L = st[prefix_len]
+        st[prefix_len] = 0
+        cx16.r9H = compare(st, prefix) as ubyte
+        st[prefix_len] = cx16.r9L
+        return cx16.r9H==0
+    }
+
+    sub endswith(str st, str suffix) -> bool {
+        ubyte suffix_len = length(suffix)
+        ubyte str_len = length(st)
+        if suffix_len > str_len
+            return false
+        return compare(st + str_len - suffix_len, suffix) == 0
+    }
+
     asmsub pattern_match(str string @AY, str pattern @R0) clobbers(Y) -> ubyte @A {
 		%asm {{
 ; pattern matching of a string.
@@ -293,5 +314,4 @@ fail    clc             ; yes, no match found, return with c=0
 	rts
 		}}
 	}
-
 }

compiler/res/prog8lib/virtual/conv.p8

@@ -196,7 +196,7 @@ sub  str2uword(str string) -> uword {
     ;    the number may NOT be preceded by a + sign and may NOT contain spaces
     ;    (any non-digit character will terminate the number string that is parsed)
     %asm {{
-        loadm.w r0, {conv.str2uword.string}
+        loadm.w r0,conv.str2uword.string
         syscall 11
         return
     }}
@@ -207,7 +207,7 @@ sub  str2word(str string) -> word {
     ;    the number may be preceded by a + or - sign but may NOT contain spaces
     ;    (any non-digit character will terminate the number string that is parsed)
     %asm {{
-        loadm.w r0, {conv.str2word.string}
+        loadm.w r0,conv.str2word.string
         syscall 12
         return
     }}
@@ -251,4 +251,13 @@ sub  bin2uword(str string) -> uword {
     }
 }
 
+sub  any2uword(str string) -> uword {
+    ; -- convert any number string (any prefix allowed) to uword.
+    when string[0] {
+        '$' -> return hex2uword(string)
+        '%' -> return bin2uword(string)
+        else -> return str2uword(string)
+    }
+}
+
 }

compiler/res/prog8lib/virtual/floats.p8

@@ -10,7 +10,7 @@ floats {
 sub print_f(float value) {
     ; ---- prints the floating point value (without a newline).
     %asm {{
-        loadm.f fr0,{floats.print_f.value}
+        loadm.f fr0,floats.print_f.value
         syscall 25
         return
     }}
@@ -18,8 +18,8 @@ sub print_f(float value) {
 
 sub pow(float value, float power) -> float {
     %asm {{
-        loadm.f fr0,{floats.pow.value}
+        loadm.f fr0,floats.pow.value
-        loadm.f fr1,{floats.pow.power}
+        loadm.f fr1,floats.pow.power
         fpow.f fr0,fr1
         return
     }}
@@ -27,7 +27,7 @@ sub pow(float value, float power) -> float {
 
 sub fabs(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.fabs.value}
+        loadm.f fr0,floats.fabs.value
         fabs.f fr0,fr0
         return
     }}
@@ -35,7 +35,7 @@ sub fabs(float value) -> float {
 
 sub sin(float angle) -> float {
     %asm {{
-        loadm.f fr0,{floats.sin.angle}
+        loadm.f fr0,floats.sin.angle
         fsin.f fr0,fr0
         return
     }}
@@ -43,7 +43,7 @@ sub sin(float angle) -> float {
 
 sub cos(float angle) -> float {
     %asm {{
-        loadm.f fr0,{floats.cos.angle}
+        loadm.f fr0,floats.cos.angle
         fcos.f fr0,fr0
         return
     }}
@@ -51,7 +51,7 @@ sub cos(float angle) -> float {
 
 sub tan(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.tan.value}
+        loadm.f fr0,floats.tan.value
         ftan.f fr0,fr0
         return
     }}
@@ -59,7 +59,7 @@ sub tan(float value) -> float {
 
 sub atan(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.atan.value}
+        loadm.f fr0,floats.atan.value
         fatan.f fr0,fr0
         return
     }}
@@ -67,7 +67,7 @@ sub atan(float value) -> float {
 
 sub ln(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.ln.value}
+        loadm.f fr0,floats.ln.value
         fln.f fr0,fr0
         return
     }}
@@ -75,7 +75,7 @@ sub ln(float value) -> float {
 
 sub log2(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.log2.value}
+        loadm.f fr0,floats.log2.value
         flog.f fr0,fr0
         return
     }}
@@ -83,8 +83,8 @@ sub log2(float value) -> float {
 
 sub sqrt(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.sqrt.value}
+        loadm.f fr0,floats.sqrt.value
-        fsqrt.f fr0,fr0
+        sqrt.f fr0,fr0
         return
     }}
 }
@@ -101,7 +101,7 @@ sub deg(float angle) -> float {
 
 sub round(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.round.value}
+        loadm.f fr0,floats.round.value
         fround.f fr0,fr0
         return
     }}
@@ -109,7 +109,7 @@ sub round(float value) -> float {
 
 sub floor(float value) -> float {
     %asm {{
-        loadm.f fr0,{floats.floor.value}
+        loadm.f fr0,floats.floor.value
         ffloor.f fr0,fr0
         return
     }}
@@ -118,7 +118,7 @@ sub floor(float value) -> float {
 sub ceil(float value) -> float {
     ; -- ceil: tr = int(f); if tr==f -> return  else return tr+1
     %asm {{
-        loadm.f fr0,{floats.ceil.value}
+        loadm.f fr0,floats.ceil.value
         fceil.f fr0,fr0
         return
     }}

compiler/res/prog8lib/virtual/math.p8

@@ -44,27 +44,49 @@ math {
     }
 
     sub sin8(ubyte angle) -> byte {
-        return 42     ; TODO
+        ubyte[256] sintab = [
+            $00, $03, $06, $09,
+            $0c, $0f, $12, $15, $18, $1b, $1e, $21, $24, $27, $2a, $2d, $30, $33, $36, $39,
+            $3b, $3e, $41, $43, $46, $49, $4b, $4e, $50, $52, $55, $57, $59, $5b, $5e, $60,
+            $62, $64, $66, $67, $69, $6b, $6c, $6e, $70, $71, $72, $74, $75, $76, $77, $78,
+            $79, $7a, $7b, $7b, $7c, $7d, $7d, $7e, $7e, $7e, $7e, $7e, $7f, $7e, $7e, $7e,
+            $7e, $7e, $7d, $7d, $7c, $7b, $7b, $7a, $79, $78, $77, $76, $75, $74, $72, $71,
+            $70, $6e, $6c, $6b, $69, $67, $66, $64, $62, $60, $5e, $5b, $59, $57, $55, $52,
+            $50, $4e, $4b, $49, $46, $43, $41, $3e, $3b, $39, $36, $33, $30, $2d, $2a, $27,
+            $24, $21, $1e, $1b, $18, $15, $12, $0f, $0c, $09, $06, $03, $00, $fd, $fa, $f7,
+            $f4, $f1, $ee, $eb, $e8, $e5, $e2, $df, $dc, $d9, $d6, $d3, $d0, $cd, $ca, $c7,
+            $c5, $c2, $bf, $bd, $ba, $b7, $b5, $b2, $b0, $ae, $ab, $a9, $a7, $a5, $a2, $a0,
+            $9e, $9c, $9a, $99, $97, $95, $94, $92, $90, $8f, $8e, $8c, $8b, $8a, $89, $88,
+            $87, $86, $85, $85, $84, $83, $83, $82, $82, $82, $82, $82, $81, $82, $82, $82,
+            $82, $82, $83, $83, $84, $85, $85, $86, $87, $88, $89, $8a, $8b, $8c, $8e, $8f,
+            $90, $92, $94, $95, $97, $99, $9a, $9c, $9e, $a0, $a2, $a5, $a7, $a9, $ab, $ae,
+            $b0, $b2, $b5, $b7, $ba, $bd, $bf, $c2, $c5, $c7, $ca, $cd, $d0, $d3, $d6, $d9,
+            $dc, $df, $e2, $e5, $e8, $eb, $ee, $f1, $f4, $f7, $fa, $fd
+        ]
+        return sintab[angle] as byte
     }
 
     sub cos8(ubyte angle) -> byte {
-        return 42     ; TODO
+        ubyte[256] costab = [
-    }
+            $7f, $7e, $7e, $7e,
-
+            $7e, $7e, $7d, $7d, $7c, $7b, $7b, $7a, $79, $78, $77, $76, $75, $74, $72, $71,
-    sub sin16(ubyte angle) -> word {
+            $70, $6e, $6c, $6b, $69, $67, $66, $64, $62, $60, $5e, $5b, $59, $57, $55, $52,
-        return 4242     ; TODO
+            $50, $4e, $4b, $49, $46, $43, $41, $3e, $3b, $39, $36, $33, $30, $2d, $2a, $27,
-    }
+            $24, $21, $1e, $1b, $18, $15, $12, $0f, $0c, $09, $06, $03, $00, $fd, $fa, $f7,
-
+            $f4, $f1, $ee, $eb, $e8, $e5, $e2, $df, $dc, $d9, $d6, $d3, $d0, $cd, $ca, $c7,
-    sub cos16(ubyte angle) -> word {
+            $c5, $c2, $bf, $bd, $ba, $b7, $b5, $b2, $b0, $ae, $ab, $a9, $a7, $a5, $a2, $a0,
-        return 4242     ; TODO
+            $9e, $9c, $9a, $99, $97, $95, $94, $92, $90, $8f, $8e, $8c, $8b, $8a, $89, $88,
-    }
+            $87, $86, $85, $85, $84, $83, $83, $82, $82, $82, $82, $82, $81, $82, $82, $82,
-
+            $82, $82, $83, $83, $84, $85, $85, $86, $87, $88, $89, $8a, $8b, $8c, $8e, $8f,
-    sub sin16u(ubyte angle) -> uword {
+            $90, $92, $94, $95, $97, $99, $9a, $9c, $9e, $a0, $a2, $a5, $a7, $a9, $ab, $ae,
-        return 4242     ; TODO
+            $b0, $b2, $b5, $b7, $ba, $bd, $bf, $c2, $c5, $c7, $ca, $cd, $d0, $d3, $d6, $d9,
-    }
+            $dc, $df, $e2, $e5, $e8, $eb, $ee, $f1, $f4, $f7, $fa, $fd, $00, $03, $06, $09,
-
+            $0c, $0f, $12, $15, $18, $1b, $1e, $21, $24, $27, $2a, $2d, $30, $33, $36, $39,
-    sub cos16u(ubyte angle) -> uword {
+            $3b, $3e, $41, $43, $46, $49, $4b, $4e, $50, $52, $55, $57, $59, $5b, $5e, $60,
-        return 4242     ; TODO
+            $62, $64, $66, $67, $69, $6b, $6c, $6e, $70, $71, $72, $74, $75, $76, $77, $78,
+            $79, $7a, $7b, $7b, $7c, $7d, $7d, $7e, $7e, $7e, $7e, $7e
+        ]
+        return costab[angle] as byte
     }
 
     sub sinr8u(ubyte radians) -> ubyte {
@@ -102,26 +124,39 @@ math {
     }
 
     sub sinr8(ubyte radians) -> byte {
-        return 42     ; TODO
+        ubyte[180] sintab = [
+            $00, $04, $08, $0d,
+            $11, $16, $1a, $1e, $23, $27, $2b, $2f, $33, $37, $3b, $3f, $43, $47, $4a, $4e,
+            $51, $54, $58, $5b, $5e, $61, $64, $66, $69, $6b, $6d, $70, $72, $74, $75, $77,
+            $78, $7a, $7b, $7c, $7d, $7d, $7e, $7e, $7e, $7f, $7e, $7e, $7e, $7d, $7d, $7c,
+            $7b, $7a, $78, $77, $75, $74, $72, $70, $6d, $6b, $69, $66, $64, $61, $5e, $5b,
+            $58, $54, $51, $4e, $4a, $47, $43, $3f, $3b, $37, $33, $2f, $2b, $27, $23, $1e,
+            $1a, $16, $11, $0d, $08, $04, $00, $fc, $f8, $f3, $ef, $ea, $e6, $e2, $dd, $d9,
+            $d5, $d1, $cd, $c9, $c5, $c1, $bd, $b9, $b6, $b2, $af, $ac, $a8, $a5, $a2, $9f,
+            $9c, $9a, $97, $95, $93, $90, $8e, $8c, $8b, $89, $88, $86, $85, $84, $83, $83,
+            $82, $82, $82, $81, $82, $82, $82, $83, $83, $84, $85, $86, $88, $89, $8b, $8c,
+            $8e, $90, $93, $95, $97, $9a, $9c, $9f, $a2, $a5, $a8, $ac, $af, $b2, $b6, $b9,
+            $bd, $c1, $c5, $c9, $cd, $d1, $d5, $d9, $dd, $e2, $e6, $ea, $ef, $f3, $f8, $fc
+        ]
+        return sintab[radians] as byte
     }
 
     sub cosr8(ubyte radians) -> byte {
-        return 42     ; TODO
+        ubyte[180] costab = [
+            $7f, $7e, $7e, $7e, $7d, $7d, $7c,
+            $7b, $7a, $78, $77, $75, $74, $72, $70, $6d, $6b, $69, $66, $64, $61, $5e, $5b,
+            $58, $54, $51, $4e, $4a, $47, $43, $3f, $3b, $37, $33, $2f, $2b, $27, $23, $1e,
+            $1a, $16, $11, $0d, $08, $04, $00, $fc, $f8, $f3, $ef, $ea, $e6, $e2, $dd, $d9,
+            $d5, $d1, $cd, $c9, $c5, $c1, $bd, $b9, $b6, $b2, $af, $ac, $a8, $a5, $a2, $9f,
+            $9c, $9a, $97, $95, $93, $90, $8e, $8c, $8b, $89, $88, $86, $85, $84, $83, $83,
+            $82, $82, $82, $81, $82, $82, $82, $83, $83, $84, $85, $86, $88, $89, $8b, $8c,
+            $8e, $90, $93, $95, $97, $9a, $9c, $9f, $a2, $a5, $a8, $ac, $af, $b2, $b6, $b9,
+            $bd, $c1, $c5, $c9, $cd, $d1, $d5, $d9, $dd, $e2, $e6, $ea, $ef, $f3, $f8, $fc,
+            $00, $04, $08, $0d, $11, $16, $1a, $1e, $23, $27, $2b, $2f, $33, $37, $3b, $3f,
+            $43, $47, $4a, $4e, $51, $54, $58, $5b, $5e, $61, $64, $66, $69, $6b, $6d, $70,
+            $72, $74, $75, $77, $78, $7a, $7b, $7c, $7d, $7d, $7e, $7e, $7e
+        ]
+        return costab[radians] as byte
     }
 
-    sub sinr16(ubyte radians) -> word {
-        return 4242     ; TODO
-    }
-
-    sub cosr16(ubyte radians) -> word {
-        return 4242     ; TODO
-    }
-
-    sub sinr16u(ubyte radians) -> uword {
-        return 4242     ; TODO
-    }
-
-    sub cosr16u(ubyte radians) -> uword {
-        return 4242     ; TODO
-    }
 }

compiler/res/prog8lib/virtual/prog8_lib.p8

@@ -42,8 +42,8 @@ prog8_lib {
         ; Note that you can also directly compare strings and string values with eachother using
         ; comparison operators ==, < etcetera (it will use strcmp for you under water automatically).
         %asm {{
-            loadm.w r0, {prog8_lib.string_compare.st1}
+            loadm.w r0,prog8_lib.string_compare.st1
-            loadm.w r1, {prog8_lib.string_compare.st2}
+            loadm.w r1,prog8_lib.string_compare.st2
             syscall 29
             return
         }}

compiler/res/prog8lib/virtual/string.p8

@@ -113,4 +113,24 @@ string {
             ix++
         }
     }
+
+    sub startswith(str st, str prefix) -> bool {
+        ubyte prefix_len = length(prefix)
+        ubyte str_len = length(st)
+        if prefix_len > str_len
+            return false
+        cx16.r9L = st[prefix_len]
+        st[prefix_len] = 0
+        cx16.r9H = compare(st, prefix) as ubyte
+        st[prefix_len] = cx16.r9L
+        return cx16.r9H==0
+    }
+
+    sub endswith(str st, str suffix) -> bool {
+        ubyte suffix_len = length(suffix)
+        ubyte str_len = length(st)
+        if suffix_len > str_len
+            return false
+        return compare(st + str_len - suffix_len, suffix) == 0
+    }
 }

compiler/res/prog8lib/virtual/syslib.p8

@@ -15,7 +15,7 @@ sys {
     sub wait(uword jiffies) {
         ; --- wait approximately the given number of jiffies (1/60th seconds)
         %asm {{
-            loadm.w r0, {sys.wait.jiffies}
+            loadm.w r0,sys.wait.jiffies
             syscall 13
         }}
     }
@@ -62,7 +62,7 @@ sys {
     sub exit(ubyte returnvalue) {
         ; -- immediately exit the program with a return code in the A register
         %asm {{
-            loadm.b r0,{sys.exit.returnvalue}
+            loadm.b r0,sys.exit.returnvalue
             syscall 1
         }}
     }
@@ -82,125 +82,140 @@ sys {
 
     sub gfx_enable(ubyte mode) {
         %asm {{
-            loadm.b r0, {sys.gfx_enable.mode}
+            loadm.b r0,sys.gfx_enable.mode
             syscall 8
         }}
     }
 
+    sub gfx_clear(ubyte color) {
+        %asm {{
+            loadm.b r0,sys.gfx_clear.color
+            syscall 9
+        }}
+    }
+
     sub gfx_plot(uword xx, uword yy, ubyte color) {
         %asm {{
-            loadm.w r0, {sys.gfx_plot.xx}
+            loadm.w r0,sys.gfx_plot.xx
-            loadm.w r1, {sys.gfx_plot.yy}
+            loadm.w r1,sys.gfx_plot.yy
-            loadm.b r2, {sys.gfx_plot.color}
+            loadm.b r2,sys.gfx_plot.color
             syscall 10
         }}
     }
+
+    sub gfx_getpixel(uword xx, uword yy) -> ubyte {
+        %asm {{
+            loadm.w r0,sys.gfx_getpixel.xx
+            loadm.w r1,sys.gfx_getpixel.yy
+            syscall 30
+            return
+        }}
+    }
 }
 
 cx16 {
 
     ; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
     ; they are simulated on the VirtualMachine as well but their location in memory is different
-; the sixteen virtual 16-bit registers in both normal unsigned mode and signed mode (s)
+    &uword r0  = $ff02
-    &uword r0  = $0002
+    &uword r1  = $ff04
-    &uword r1  = $0004
+    &uword r2  = $ff06
-    &uword r2  = $0006
+    &uword r3  = $ff08
-    &uword r3  = $0008
+    &uword r4  = $ff0a
-    &uword r4  = $000a
+    &uword r5  = $ff0c
-    &uword r5  = $000c
+    &uword r6  = $ff0e
-    &uword r6  = $000e
+    &uword r7  = $ff10
-    &uword r7  = $0010
+    &uword r8  = $ff12
-    &uword r8  = $0012
+    &uword r9  = $ff14
-    &uword r9  = $0014
+    &uword r10 = $ff16
-    &uword r10 = $0016
+    &uword r11 = $ff18
-    &uword r11 = $0018
+    &uword r12 = $ff1a
-    &uword r12 = $001a
+    &uword r13 = $ff1c
-    &uword r13 = $001c
+    &uword r14 = $ff1e
-    &uword r14 = $001e
+    &uword r15 = $ff20
-    &uword r15 = $0020
 
-    &word r0s  = $0002
+    &word r0s  = $ff02
-    &word r1s  = $0004
+    &word r1s  = $ff04
-    &word r2s  = $0006
+    &word r2s  = $ff06
-    &word r3s  = $0008
+    &word r3s  = $ff08
-    &word r4s  = $000a
+    &word r4s  = $ff0a
-    &word r5s  = $000c
+    &word r5s  = $ff0c
-    &word r6s  = $000e
+    &word r6s  = $ff0e
-    &word r7s  = $0010
+    &word r7s  = $ff10
-    &word r8s  = $0012
+    &word r8s  = $ff12
-    &word r9s  = $0014
+    &word r9s  = $ff14
-    &word r10s = $0016
+    &word r10s = $ff16
-    &word r11s = $0018
+    &word r11s = $ff18
-    &word r12s = $001a
+    &word r12s = $ff1a
-    &word r13s = $001c
+    &word r13s = $ff1c
-    &word r14s = $001e
+    &word r14s = $ff1e
-    &word r15s = $0020
+    &word r15s = $ff20
 
-    &ubyte r0L  = $0002
+    &ubyte r0L  = $ff02
-    &ubyte r1L  = $0004
+    &ubyte r1L  = $ff04
-    &ubyte r2L  = $0006
+    &ubyte r2L  = $ff06
-    &ubyte r3L  = $0008
+    &ubyte r3L  = $ff08
-    &ubyte r4L  = $000a
+    &ubyte r4L  = $ff0a
-    &ubyte r5L  = $000c
+    &ubyte r5L  = $ff0c
-    &ubyte r6L  = $000e
+    &ubyte r6L  = $ff0e
-    &ubyte r7L  = $0010
+    &ubyte r7L  = $ff10
-    &ubyte r8L  = $0012
+    &ubyte r8L  = $ff12
-    &ubyte r9L  = $0014
+    &ubyte r9L  = $ff14
-    &ubyte r10L = $0016
+    &ubyte r10L = $ff16
-    &ubyte r11L = $0018
+    &ubyte r11L = $ff18
-    &ubyte r12L = $001a
+    &ubyte r12L = $ff1a
-    &ubyte r13L = $001c
+    &ubyte r13L = $ff1c
-    &ubyte r14L = $001e
+    &ubyte r14L = $ff1e
-    &ubyte r15L = $0020
+    &ubyte r15L = $ff20
 
-    &ubyte r0H  = $0003
+    &ubyte r0H  = $ff03
-    &ubyte r1H  = $0005
+    &ubyte r1H  = $ff05
-    &ubyte r2H  = $0007
+    &ubyte r2H  = $ff07
-    &ubyte r3H  = $0009
+    &ubyte r3H  = $ff09
-    &ubyte r4H  = $000b
+    &ubyte r4H  = $ff0b
-    &ubyte r5H  = $000d
+    &ubyte r5H  = $ff0d
-    &ubyte r6H  = $000f
+    &ubyte r6H  = $ff0f
-    &ubyte r7H  = $0011
+    &ubyte r7H  = $ff11
-    &ubyte r8H  = $0013
+    &ubyte r8H  = $ff13
-    &ubyte r9H  = $0015
+    &ubyte r9H  = $ff15
-    &ubyte r10H = $0017
+    &ubyte r10H = $ff17
-    &ubyte r11H = $0019
+    &ubyte r11H = $ff19
-    &ubyte r12H = $001b
+    &ubyte r12H = $ff1b
-    &ubyte r13H = $001d
+    &ubyte r13H = $ff1d
-    &ubyte r14H = $001f
+    &ubyte r14H = $ff1f
-    &ubyte r15H = $0021
+    &ubyte r15H = $ff21
 
-    &byte r0sL  = $0002
+    &byte r0sL  = $ff02
-    &byte r1sL  = $0004
+    &byte r1sL  = $ff04
-    &byte r2sL  = $0006
+    &byte r2sL  = $ff06
-    &byte r3sL  = $0008
+    &byte r3sL  = $ff08
-    &byte r4sL  = $000a
+    &byte r4sL  = $ff0a
-    &byte r5sL  = $000c
+    &byte r5sL  = $ff0c
-    &byte r6sL  = $000e
+    &byte r6sL  = $ff0e
-    &byte r7sL  = $0010
+    &byte r7sL  = $ff10
-    &byte r8sL  = $0012
+    &byte r8sL  = $ff12
-    &byte r9sL  = $0014
+    &byte r9sL  = $ff14
-    &byte r10sL = $0016
+    &byte r10sL = $ff16
-    &byte r11sL = $0018
+    &byte r11sL = $ff18
-    &byte r12sL = $001a
+    &byte r12sL = $ff1a
-    &byte r13sL = $001c
+    &byte r13sL = $ff1c
-    &byte r14sL = $001e
+    &byte r14sL = $ff1e
-    &byte r15sL = $0020
+    &byte r15sL = $ff20
 
-    &byte r0sH  = $0003
+    &byte r0sH  = $ff03
-    &byte r1sH  = $0005
+    &byte r1sH  = $ff05
-    &byte r2sH  = $0007
+    &byte r2sH  = $ff07
-    &byte r3sH  = $0009
+    &byte r3sH  = $ff09
-    &byte r4sH  = $000b
+    &byte r4sH  = $ff0b
-    &byte r5sH  = $000d
+    &byte r5sH  = $ff0d
-    &byte r6sH  = $000f
+    &byte r6sH  = $ff0f
-    &byte r7sH  = $0011
+    &byte r7sH  = $ff11
-    &byte r8sH  = $0013
+    &byte r8sH  = $ff13
-    &byte r9sH  = $0015
+    &byte r9sH  = $ff15
-    &byte r10sH = $0017
+    &byte r10sH = $ff17
-    &byte r11sH = $0019
+    &byte r11sH = $ff19
-    &byte r12sH = $001b
+    &byte r12sH = $ff1b
-    &byte r13sH = $001d
+    &byte r13sH = $ff1d
-    &byte r14sH = $001f
+    &byte r14sH = $ff1f
-    &byte r15sH = $0021
+    &byte r15sH = $ff21
 }

compiler/res/prog8lib/virtual/textio.p8

@@ -7,7 +7,7 @@ txt {
 sub  clear_screen() {
     str @shared sequence = "\x1b[2J\x1B[H"
     %asm {{
-        load.w r0, {txt.clear_screen.sequence}
+        load.w r0,txt.clear_screen.sequence
         syscall 3
     }}
 }
@@ -30,14 +30,14 @@ sub uppercase() {
 
 sub chrout(ubyte char) {
     %asm {{
-        loadm.b r0, {txt.chrout.char}
+        loadm.b r0,txt.chrout.char
         syscall 2
     }}
 }
 
 sub  print (str text) {
     %asm {{
-        loadm.w r0, {txt.print.text}
+        loadm.w r0,txt.print.text
         syscall 3
     }}
 }
@@ -114,7 +114,7 @@ sub  input_chars  (uword buffer) -> ubyte  {
     ; ---- Input a string (max. 80 chars) from the keyboard. Returns length of input. (string is terminated with a 0 byte as well)
     ;      It assumes the keyboard is selected as I/O channel!
     %asm {{
-        loadm.w r0,{txt.input_chars.buffer}
+        loadm.w r0,txt.input_chars.buffer
         syscall 6
         return
     }}

compiler/res/version.txt

@@ -1 +1 @@
-8.2
+8.5

compiler/src/prog8/CompilerMain.kt

@@ -2,22 +2,19 @@ package prog8
 
 import kotlinx.cli.*
 import prog8.ast.base.AstException
-import prog8.code.core.CbmPrgLauncherType
+import prog8.code.core.*
 import prog8.code.target.*
 import prog8.code.target.virtual.VirtualMachineDefinition
+import prog8.codegen.virtual.VmCodeGen
 import prog8.compiler.CompilationResult
 import prog8.compiler.CompilerArguments
 import prog8.compiler.compileProgram
 import java.io.File
-import java.nio.file.FileSystems
+import java.nio.file.*
-import java.nio.file.Path
-import java.nio.file.Paths
-import java.nio.file.StandardWatchEventKinds
 import java.time.LocalDateTime
 import kotlin.system.exitProcess
 
 
-
 fun main(args: Array<String>) {
     val buildVersion = object {}.javaClass.getResource("/version.txt")?.readText()?.trim()
     println("\nProg8 compiler v$buildVersion by Irmen de Jong (irmen@razorvine.net)")
@@ -34,22 +31,24 @@ fun pathFrom(stringPath: String, vararg rest: String): Path  = FileSystems.getDe
 
 private fun compileMain(args: Array<String>): Boolean {
     val cli = ArgParser("prog8compiler", prefixStyle = ArgParser.OptionPrefixStyle.JVM)
+    val asmListfile by cli.option(ArgType.Boolean, fullName = "asmlist", description = "make the assembler produce a listing file as well")
+    val symbolDefs by cli.option(ArgType.String, fullName = "D", description = "define assembly symbol(s) with -D SYMBOL=VALUE").multiple()
+    val evalStackAddrString by cli.option(ArgType.String, fullName = "esa", description = "override the eval-stack base address (must be page aligned)")
     val startEmulator1 by cli.option(ArgType.Boolean, fullName = "emu", description = "auto-start emulator after successful compilation")
     val startEmulator2 by cli.option(ArgType.Boolean, fullName = "emu2", description = "auto-start alternative emulator after successful compilation")
-    val outputDir by cli.option(ArgType.String, fullName = "out", description = "directory for output files instead of current directory").default(".")
+    val experimentalCodegen by cli.option(ArgType.Boolean, fullName = "expericodegen", description = "use experimental/alternative codegen")
+    val keepIR by cli.option(ArgType.Boolean, fullName = "keepIR", description = "keep the IR code file (for targets that use it)")
     val dontWriteAssembly by cli.option(ArgType.Boolean, fullName = "noasm", description="don't create assembly code")
     val dontOptimize by cli.option(ArgType.Boolean, fullName = "noopt", description = "don't perform any optimizations")
     val dontReinitGlobals by cli.option(ArgType.Boolean, fullName = "noreinit", description = "don't create code to reinitialize globals on multiple runs of the program (experimental!)")
+    val outputDir by cli.option(ArgType.String, fullName = "out", description = "directory for output files instead of current directory").default(".")
     val optimizeFloatExpressions by cli.option(ArgType.Boolean, fullName = "optfloatx", description = "optimize float expressions (warning: can increase program size)")
-    val watchMode by cli.option(ArgType.Boolean, fullName = "watch", description = "continuous compilation mode (watch for file changes)")
-    val slowCodegenWarnings by cli.option(ArgType.Boolean, fullName = "slowwarn", description="show debug warnings about slow/problematic assembly code generation")
     val quietAssembler by cli.option(ArgType.Boolean, fullName = "quietasm", description = "don't print assembler output results")
-    val asmListfile by cli.option(ArgType.Boolean, fullName = "asmlist", description = "make the assembler produce a listing file as well")
+    val slowCodegenWarnings by cli.option(ArgType.Boolean, fullName = "slowwarn", description="show debug warnings about slow/problematic assembly code generation")
-    val experimentalCodegen by cli.option(ArgType.Boolean, fullName = "expericodegen", description = "use experimental/alternative codegen")
-    val compilationTarget by cli.option(ArgType.String, fullName = "target", description = "target output of the compiler (one of '${C64Target.NAME}', '${C128Target.NAME}', '${Cx16Target.NAME}', '${AtariTarget.NAME}', '${VMTarget.NAME}')")
-        .default(C64Target.NAME)
     val sourceDirs by cli.option(ArgType.String, fullName="srcdirs", description = "list of extra paths, separated with ${File.pathSeparator}, to search in for imported modules").multiple().delimiter(File.pathSeparator)
-    val startVm by cli.option(ArgType.Boolean, fullName = "vm", description = "load and run a p8-virt listing in the VM instead")
+    val compilationTarget by cli.option(ArgType.String, fullName = "target", description = "target output of the compiler (one of '${C64Target.NAME}', '${C128Target.NAME}', '${Cx16Target.NAME}', '${AtariTarget.NAME}', '${VMTarget.NAME}')").default(C64Target.NAME)
+    val startVm by cli.option(ArgType.Boolean, fullName = "vm", description = "load and run a p8-virt or p8-ir listing in the VM instead")
+    val watchMode by cli.option(ArgType.Boolean, fullName = "watch", description = "continuous compilation mode (watch for file changes)")
     val moduleFiles by cli.argument(ArgType.String, fullName = "modules", description = "main module file(s) to compile").multiple(999)
 
     try {
@@ -84,6 +83,27 @@ private fun compileMain(args: Array<String>): Boolean {
         return runVm(moduleFiles.first())
     }
 
+    var evalStackAddr: UInt? = null
+    if(evalStackAddrString!=null) {
+        try {
+            evalStackAddr = if (evalStackAddrString!!.startsWith("0x"))
+                evalStackAddrString!!.substring(2).toUInt(16)
+            else if (evalStackAddrString!!.startsWith("$"))
+                evalStackAddrString!!.substring(1).toUInt(16)
+            else
+                evalStackAddrString!!.toUInt()
+        } catch(nx: NumberFormatException) {
+            System.err.println("invalid address for evalstack: $evalStackAddrString")
+            return false
+        }
+        if(evalStackAddr !in 256u..65536u-512u || (evalStackAddr and 255u != 0u)) {
+            System.err.println("invalid address for evalstack: ${evalStackAddr.toHex()}")
+            return false
+        }
+    }
+
+    val processedSymbols = processSymbolDefs(symbolDefs) ?: return false
+
     if(watchMode==true) {
         val watchservice = FileSystems.getDefault().newWatchService()
         val allImportedFiles = mutableSetOf<Path>()
@@ -103,7 +123,10 @@ private fun compileMain(args: Array<String>): Boolean {
                     quietAssembler == true,
                     asmListfile == true,
                     experimentalCodegen == true,
+                    keepIR == true,
                     compilationTarget,
+                    evalStackAddr,
+                    processedSymbols,
                     srcdirs,
                     outputPath
                 )
@@ -124,16 +147,26 @@ private fun compileMain(args: Array<String>): Boolean {
             }
             println("[${LocalDateTime.now().withNano(0)}]  Waiting for file changes.")
 
-            var recompile=false
+            fun determineRecompilationNeeded(event: WatchKey): Boolean {
-            while(!recompile) {
+                if(event.isValid) {
-                val event = watchservice.take()
                     for (changed in event.pollEvents()) {
+                        if (changed.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                             val changedPath = changed.context() as Path
                             if (allImportedFiles.any { it.fileName == changedPath.fileName }) {
                                 println("  change detected: $changedPath")
-                        recompile = true
+                                return true
                             }
                         }
+                    }
+                }
+                return false
+            }
+
+            var recompile=false
+            while(!recompile) {
+                val event = watchservice.take()
+                Thread.sleep(50)    // avoid multiple events on same file
+                recompile = determineRecompilationNeeded(event)
                 event.reset()
             }
 
@@ -155,7 +188,10 @@ private fun compileMain(args: Array<String>): Boolean {
                     quietAssembler == true,
                     asmListfile == true,
                     experimentalCodegen == true,
+                    keepIR == true,
                     compilationTarget,
+                    evalStackAddr,
+                    processedSymbols,
                     srcdirs,
                     outputPath
                 )
@@ -193,13 +229,43 @@ private fun compileMain(args: Array<String>): Boolean {
     return true
 }
 
+private fun processSymbolDefs(symbolDefs: List<String>): Map<String, String>? {
+    val result = mutableMapOf<String, String>()
+    val defPattern = """(.+)\s*=\s*(.+)""".toRegex()
+    for(def in symbolDefs) {
+        val match = defPattern.matchEntire(def.trim())
+        if(match==null) {
+            System.err.println("invalid symbol definition (expected NAME=VALUE): $def")
+            return null
+        }
+        val (_, name, value) = match.groupValues
+        result[name.trim()] = value.trim()
+    }
+    return result
+}
+
 fun runVm(listingFilename: String): Boolean {
-    val name =
+    if(listingFilename.endsWith(".p8ir")) {
-        if(listingFilename.endsWith(".p8virt"))
+        val withoutSuffix = listingFilename.substring(0, listingFilename.length-5)
-            listingFilename.substring(0, listingFilename.length-7)
+        val compiled = VmCodeGen.compileIR(withoutSuffix)
-        else
+        if (!compiled.assemble(CompilationOptions(  // these are just dummy options, the actual options are inside the .p8ir file itself:
-            listingFilename
+                OutputType.PRG,
+                CbmPrgLauncherType.NONE,
+                ZeropageType.DONTUSE,
+                emptyList(),
+                floats = true,
+                noSysInit = true,
+                compTarget = VMTarget(),
+                loadAddress = VMTarget().machine.PROGRAM_LOAD_ADDRESS
+            ))
+        ) {
+            return false
+        }
         val vmdef = VirtualMachineDefinition()
-    vmdef.launchEmulator(0, Paths.get(name))
+        vmdef.launchEmulator(0, Paths.get(withoutSuffix))
+        return true
+    }
+    val vmdef = VirtualMachineDefinition()
+    vmdef.launchEmulator(0, Paths.get(listingFilename))
     return true
 }

compiler/src/prog8/compiler/Compiler.kt

@@ -37,7 +37,10 @@ class CompilerArguments(val filepath: Path,
                         val quietAssembler: Boolean,
                         val asmListfile: Boolean,
                         val experimentalCodegen: Boolean,
+                        val keepIR: Boolean,
                         val compilationTarget: String,
+                        val evalStackBaseAddress: UInt?,
+                        val symbolDefs: Map<String, String>,
                         val sourceDirs: List<String> = emptyList(),
                         val outputDir: Path = Path(""),
                         val errors: IErrorReporter = ErrorReporter())
@@ -77,10 +80,18 @@ fun compileProgram(args: CompilerArguments): CompilationResult? {
                 asmQuiet = args.quietAssembler
                 asmListfile = args.asmListfile
                 experimentalCodegen = args.experimentalCodegen
+                keepIR = args.keepIR
+                evalStackBaseAddress = args.evalStackBaseAddress
                 outputDir = args.outputDir.normalize()
+                symbolDefs = args.symbolDefs
             }
             program = programresult
             importedFiles = imported
+
+            if(compilationOptions.evalStackBaseAddress!=null) {
+                compTarget.machine.overrideEvalStack(compilationOptions.evalStackBaseAddress!!)
+            }
+
             processAst(program, args.errors, compilationOptions)
             if (compilationOptions.optimize) {
 //                println("*********** AST RIGHT BEFORE OPTIMIZING *************")
@@ -319,7 +330,7 @@ fun determineCompilationOptions(program: Program, compTarget: ICompilationTarget
 
 private fun processAst(program: Program, errors: IErrorReporter, compilerOptions: CompilationOptions) {
     println("Analyzing code...")
-    program.preprocessAst(errors, compilerOptions.compTarget)
+    program.preprocessAst(errors, compilerOptions)
     program.checkIdentifiers(errors, compilerOptions)
     errors.report()
     program.charLiteralsToUByteLiterals(compilerOptions.compTarget, errors)
@@ -330,6 +341,8 @@ private fun processAst(program: Program, errors: IErrorReporter, compilerOptions
     errors.report()
     program.reorderStatements(errors, compilerOptions)
     errors.report()
+    program.changeNotExpressionAndIfComparisonExpr(errors, compilerOptions.compTarget)
+    errors.report()
     program.addTypecasts(errors, compilerOptions)
     errors.report()
     program.variousCleanups(errors, compilerOptions)
@@ -347,7 +360,7 @@ private fun optimizeAst(program: Program, compilerOptions: CompilationOptions, e
     remover.applyModifications()
     while (true) {
         // keep optimizing expressions and statements until no more steps remain
-        val optsDone1 = program.simplifyExpressions()
+        val optsDone1 = program.simplifyExpressions(compTarget)
         val optsDone2 = program.splitBinaryExpressions(compilerOptions)
         val optsDone3 = program.optimizeStatements(errors, functions, compTarget)
         val optsDone4 = program.inlineSubroutines()
@@ -434,18 +447,15 @@ internal fun asmGeneratorFor(program: Program,
                              options: CompilationOptions): IAssemblyGenerator
 {
     if(options.experimentalCodegen) {
-        if (options.compTarget.machine.cpu in arrayOf(CpuType.CPU6502, CpuType.CPU65c02)) {
-            // TODO for now, use the new Intermediary Ast for this experimental codegen:
         val intermediateAst = IntermediateAstMaker(program).transform()
-            return prog8.codegen.experimental.AsmGen(intermediateAst, symbolTable, options, errors)
+        return prog8.codegen.experimental.CodeGen(intermediateAst, symbolTable, options, errors)
-        }
     } else {
         if (options.compTarget.machine.cpu in arrayOf(CpuType.CPU6502, CpuType.CPU65c02))
-            // TODO rewrite 6502 codegen on new Intermediary Ast
+            // TODO rewrite 6502 codegen on new Intermediary Ast or on new Intermediate Representation
             return prog8.codegen.cpu6502.AsmGen(program, symbolTable, options, errors)
         if (options.compTarget.name == VMTarget.NAME) {
             val intermediateAst = IntermediateAstMaker(program).transform()
-            return prog8.codegen.virtual.CodeGen(intermediateAst, symbolTable, options, errors)
+            return prog8.codegen.virtual.VmCodeGen(intermediateAst, symbolTable, options, errors)
         }
     }
 

compiler/src/prog8/compiler/astprocessing/AstChecker.kt

@@ -78,16 +78,30 @@ internal class AstChecker(private val program: Program,
             if(!valueDt.isKnown) {
                 errors.err("return value type mismatch or unknown symbol", returnStmt.value!!.position)
             } else {
-                if (expectedReturnValues[0] != valueDt.getOr(DataType.UNDEFINED))
+                if (expectedReturnValues[0] != valueDt.getOr(DataType.UNDEFINED)) {
+                    if(valueDt istype DataType.BOOL && expectedReturnValues[0] == DataType.UBYTE) {
+                        // if the return value is a bool and the return type is ubyte, allow this. But give a warning.
+                        errors.warn("return type of the subroutine should probably be bool instead of ubyte", returnStmt.position)
+                    } else if(valueDt istype DataType.UBYTE && expectedReturnValues[0] == DataType.BOOL) {
+                        // if the return value is ubyte and the return type is bool, allow this only if value is 0 or 1
+                        val returnValue = returnStmt.value as? NumericLiteral
+                        if (returnValue == null || returnValue.type != DataType.UBYTE || (returnValue.number!=0.0 && returnValue.number!=1.0)) {
                             errors.err("type $valueDt of return value doesn't match subroutine's return type ${expectedReturnValues[0]}",returnStmt.value!!.position)
                         }
                     }
+                    else {
+                        errors.err("type $valueDt of return value doesn't match subroutine's return type ${expectedReturnValues[0]}",returnStmt.value!!.position)
+                    }
+                }
+            }
+        }
         super.visit(returnStmt)
     }
 
     override fun visit(ifElse: IfElse) {
-        if(!ifElse.condition.inferType(program).isInteger)
+        val dt = ifElse.condition.inferType(program)
-            errors.err("condition value should be an integer type", ifElse.condition.position)
+        if(!dt.isInteger && !dt.istype(DataType.BOOL))
+            errors.err("condition value should be an integer type or bool", ifElse.condition.position)
         super.visit(ifElse)
     }
 
@@ -119,6 +133,10 @@ internal class AstChecker(private val program: Program,
 
                         checkUnsignedLoopDownto0(forLoop.iterable as? RangeExpression)
                     }
+                    DataType.BOOL -> {
+                        if(iterableDt != DataType.ARRAY_BOOL)
+                            errors.err("bool loop variable can only loop over boolean array", forLoop.position)
+                    }
                     DataType.UWORD -> {
                         if(iterableDt!= DataType.UBYTE && iterableDt!= DataType.UWORD && iterableDt != DataType.STR &&
                                 iterableDt != DataType.ARRAY_UB && iterableDt!= DataType.ARRAY_UW)
@@ -184,16 +202,6 @@ internal class AstChecker(private val program: Program,
         super.visit(jump)
     }
 
-    override fun visit(gosub: GoSub) {
-        val targetStatement = checkFunctionOrLabelExists(gosub.identifier, gosub)
-        if(targetStatement!=null) {
-            if(targetStatement is BuiltinFunctionPlaceholder)
-                errors.err("can't gosub to a builtin function", gosub.position)
-        }
-
-        super.visit(gosub)
-    }
-
     override fun visit(block: Block) {
         val addr = block.address
         if(addr!=null && addr>65535u) {
@@ -251,10 +259,7 @@ internal class AstChecker(private val program: Program,
                     )
                         count++
                 } else {
-                    if(" return" in assembly || "\treturn" in assembly
+                    if(" return" in assembly || "\treturn" in assembly || " jump" in assembly || "\tjump" in assembly)
-                        || " jump" in assembly || "\tjump" in assembly
-                        || " jumpi" in assembly || "\tjumpi" in assembly
-                    )
                         count++
                 }
             }
@@ -295,7 +300,7 @@ internal class AstChecker(private val program: Program,
             if (subroutine.returntypes.isNotEmpty()) {
                 // for asm subroutines with an address, no statement check is possible.
                 if (subroutine.asmAddress == null && !subroutine.inline)
-                    err("non-inline subroutine has result value(s) and thus must have at least one 'return' or 'goto' in it (or rts/jmp/bra in case of %asm)")
+                    err("non-inline subroutine has result value(s) and thus must have at least one 'return' or 'goto' in it (or the assembler equivalent in case of %asm)")
             }
         }
 
@@ -309,8 +314,8 @@ internal class AstChecker(private val program: Program,
                 err("number of return registers is not the isSameAs as number of return values")
             for(param in subroutine.parameters.zip(subroutine.asmParameterRegisters)) {
                 if(param.second.registerOrPair in arrayOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
-                    if (param.first.type != DataType.UBYTE && param.first.type != DataType.BYTE)
+                    if (param.first.type != DataType.UBYTE && param.first.type != DataType.BYTE && param.first.type != DataType.BOOL)
-                        err("parameter '${param.first.name}' should be (u)byte")
+                        err("parameter '${param.first.name}' should be (u)byte or bool")
                 }
                 else if(param.second.registerOrPair in arrayOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
                     if (param.first.type != DataType.UWORD && param.first.type != DataType.WORD
@@ -324,17 +329,17 @@ internal class AstChecker(private val program: Program,
             }
             subroutine.returntypes.zip(subroutine.asmReturnvaluesRegisters).forEachIndexed { index, pair ->
                 if(pair.second.registerOrPair in arrayOf(RegisterOrPair.A, RegisterOrPair.X, RegisterOrPair.Y)) {
-                    if (pair.first != DataType.UBYTE && pair.first != DataType.BYTE)
+                    if (pair.first != DataType.UBYTE && pair.first != DataType.BYTE && pair.first != DataType.BOOL)
-                        err("return value #${index + 1} should be (u)byte")
+                        err("return type #${index + 1} should be (u)byte")
                 }
-                else if(pair.second.registerOrPair in arrayOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
+                else if(pair.second.registerOrPair in setOf(RegisterOrPair.AX, RegisterOrPair.AY, RegisterOrPair.XY)) {
                     if (pair.first != DataType.UWORD && pair.first != DataType.WORD
                             && pair.first != DataType.STR && pair.first !in ArrayDatatypes && pair.first != DataType.FLOAT)
-                        err("return value #${index + 1} should be (u)word/address")
+                        err("return type #${index + 1} should be (u)word/address")
                 }
                 else if(pair.second.statusflag!=null) {
                     if (pair.first != DataType.UBYTE)
-                        err("return value #${index + 1} should be ubyte")
+                        err("return type #${index + 1} should be ubyte")
                 }
             }
 
@@ -418,14 +423,16 @@ internal class AstChecker(private val program: Program,
     }
 
     override fun visit(untilLoop: UntilLoop) {
-        if(!untilLoop.condition.inferType(program).isInteger)
+        val dt = untilLoop.condition.inferType(program)
-            errors.err("condition value should be an integer type", untilLoop.condition.position)
+        if(!dt.isInteger && !dt.istype(DataType.BOOL))
+            errors.err("condition value should be an integer type or bool", untilLoop.condition.position)
         super.visit(untilLoop)
     }
 
     override fun visit(whileLoop: WhileLoop) {
-        if(!whileLoop.condition.inferType(program).isInteger)
+        val dt = whileLoop.condition.inferType(program)
-            errors.err("condition value should be an integer type", whileLoop.condition.position)
+        if(!dt.isInteger && !dt.istype(DataType.BOOL))
+            errors.err("condition value should be an integer type or bool", whileLoop.condition.position)
         super.visit(whileLoop)
     }
 
@@ -462,6 +469,13 @@ internal class AstChecker(private val program: Program,
         if(numvalue!=null && targetDt.isKnown)
             checkValueTypeAndRange(targetDt.getOr(DataType.UNDEFINED), numvalue)
 
+// for now, don't enforce bool type with only logical operators...
+//        if(assignment.isAugmentable && targetDt istype DataType.BOOL) {
+//            val operator = (assignment.value as? BinaryExpression)?.operator
+//            if(operator in InvalidOperatorsForBoolean)
+//                errors.err("can't use boolean operand with this operator $operator", assignment.position)
+//        }
+
         super.visit(assignment)
     }
 
@@ -603,7 +617,7 @@ internal class AstChecker(private val program: Program,
                         err("memory address must be valid integer 0..\$ffff")
                     }
                 } else {
-                    err("value of memory mapped variable can only be a fixed number, perhaps you meant to use an address pointer type instead?")
+                    err("value of memory mapped variable can only be a constant, maybe use an address pointer type instead?")
                 }
             }
         }
@@ -772,8 +786,11 @@ internal class AstChecker(private val program: Program,
 
         fun isPassByReferenceElement(e: Expression): Boolean {
             if(e is IdentifierReference) {
-                val decl = e.targetVarDecl(program)!!
+                val decl = e.targetVarDecl(program)
-                return decl.datatype in PassByReferenceDatatypes
+                return if(decl!=null)
+                    decl.datatype in PassByReferenceDatatypes
+                else
+                    true     // is probably a symbol that needs addr-of
             }
             return e is StringLiteral
         }
@@ -823,10 +840,6 @@ internal class AstChecker(private val program: Program,
                 errors.err("can only take negative of a signed number type", expr.position)
             }
         }
-        else if(expr.operator == "not") {
-            if(dt !in IntegerDatatypes)
-                errors.err("can only use boolean not on integer types", expr.position)
-        }
         else if(expr.operator == "~") {
             if(dt !in IntegerDatatypes)
                 errors.err("can only use bitwise invert on integer types", expr.position)
@@ -863,11 +876,6 @@ internal class AstChecker(private val program: Program,
                         errors.err("remainder can only be used on unsigned integer operands", expr.right.position)
                 }
             }
-            "and", "or", "xor" -> {
-                // only integer numeric operands accepted
-                if(leftDt !in IntegerDatatypes || rightDt !in IntegerDatatypes)
-                    errors.err("logical operator can only be used on boolean operands", expr.right.position)
-            }
             "&", "|", "^" -> {
                 // only integer numeric operands accepted
                 if(leftDt !in IntegerDatatypes || rightDt !in IntegerDatatypes)
@@ -876,15 +884,17 @@ internal class AstChecker(private val program: Program,
             "in" -> throw FatalAstException("in expression should have been replaced by containmentcheck")
         }
 
-        if(leftDt !in NumericDatatypes && leftDt != DataType.STR)
+        if(leftDt !in NumericDatatypes && leftDt != DataType.STR && leftDt != DataType.BOOL)
             errors.err("left operand is not numeric or str", expr.left.position)
-        if(rightDt!in NumericDatatypes && rightDt != DataType.STR)
+        if(rightDt!in NumericDatatypes && rightDt != DataType.STR && rightDt != DataType.BOOL)
             errors.err("right operand is not numeric or str", expr.right.position)
         if(leftDt!=rightDt) {
             if(leftDt==DataType.STR && rightDt in IntegerDatatypes && expr.operator=="*") {
                 // only exception allowed: str * constvalue
                 if(expr.right.constValue(program)==null)
                     errors.err("can only use string repeat with a constant number value", expr.left.position)
+            } else if(leftDt==DataType.BOOL && rightDt in ByteDatatypes || leftDt in ByteDatatypes && rightDt==DataType.BOOL) {
+                // expression with one side BOOL other side (U)BYTE is allowed; bool==byte
             } else {
                 errors.err("left and right operands aren't the same type", expr.left.position)
             }
@@ -893,10 +903,31 @@ internal class AstChecker(private val program: Program,
         if(expr.operator !in ComparisonOperators) {
             if (leftDt == DataType.STR && rightDt == DataType.STR || leftDt in ArrayDatatypes && rightDt in ArrayDatatypes) {
                 // str+str  and  str*number have already been const evaluated before we get here.
-                errors.err("no computational expressions with strings or arrays are possible", expr.position)
+                errors.err("no computational or logical expressions with strings or arrays are possible", expr.position)
             }
         }
 
+        if(leftDt==DataType.BOOL || rightDt==DataType.BOOL ||
+            (expr.left as? TypecastExpression)?.expression?.inferType(program)?.istype(DataType.BOOL)==true ||
+            (expr.right as? TypecastExpression)?.expression?.inferType(program)?.istype(DataType.BOOL)==true) {
+            if(expr.operator in setOf("<", "<=", ">", ">=")) {
+                errors.err("can't use boolean operand with this comparison operator", expr.position)
+            }
+// for now, don't enforce bool type with only logical operators...
+//            if(expr.operator in InvalidOperatorsForBoolean && (leftDt==DataType.BOOL || (expr.left as? TypecastExpression)?.expression?.inferType(program)?.istype(DataType.BOOL)==true)) {
+//                errors.err("can't use boolean operand with this operator ${expr.operator}", expr.left.position)
+//            }
+            if(expr.operator == "==" || expr.operator == "!=") {
+                val leftNum = expr.left.constValue(program)?.number ?: 0.0
+                val rightNum = expr.right.constValue(program)?.number ?: 0.0
+                if(leftNum>1.0 || rightNum>1.0 || leftNum<0.0 || rightNum<0.0) {
+                    errors.warn("expression is always false", expr.position)
+                }
+            }
+            if((expr.operator == "/" || expr.operator == "%") && ( rightDt==DataType.BOOL || (expr.right as? TypecastExpression)?.expression?.inferType(program)?.istype(DataType.BOOL)==true)) {
+                errors.err("can't use boolean operand with this operator ${expr.operator}", expr.right.position)
+            }
+        }
     }
 
     override fun visit(typecast: TypecastExpression) {
@@ -1081,8 +1112,14 @@ internal class AstChecker(private val program: Program,
                     }
                     if(ident!=null && ident.nameInSource[0] == "cx16" && ident.nameInSource[1].startsWith("r")) {
                         var regname = ident.nameInSource[1].uppercase()
-                        if(regname.endsWith('L') || regname.endsWith('H') || regname.endsWith('s'))
+                        val lastLetter = regname.last().lowercaseChar()
+                        if(lastLetter in setOf('l', 'h', 's')) {
                             regname = regname.substring(0, regname.length - 1)
+                            val lastLetter2 = regname.last().lowercaseChar()
+                            if(lastLetter2 in setOf('l', 'h', 's')) {
+                                regname = regname.substring(0, regname.length - 1)
+                            }
+                        }
                         val reg = RegisterOrPair.valueOf(regname)
                         val same = params.filter { it.value.registerOrPair==reg }
                         for(s in same) {
@@ -1122,6 +1159,11 @@ internal class AstChecker(private val program: Program,
             }
         }
         // else if(postIncrDecr.target.memoryAddress != null) { } // a memory location can always be ++/--
+
+        if(postIncrDecr.target.inferType(program) istype DataType.BOOL) {
+            errors.err("can't use boolean operand with this operator ${postIncrDecr.operator}", postIncrDecr.position)
+        }
+
         super.visit(postIncrDecr)
     }
 
@@ -1379,6 +1421,9 @@ internal class AstChecker(private val program: Program,
                 if (number < -32768 || number > 32767)
                     return err("value '$number' out of range for word")
             }
+            DataType.BOOL -> {
+                return true
+            }
             else -> return err("value of type ${value.type} not compatible with $targetDt")
         }
         return true
@@ -1438,10 +1483,11 @@ internal class AstChecker(private val program: Program,
         }
 
         val result =  when(targetDatatype) {
-            DataType.BYTE -> sourceDatatype== DataType.BYTE
+            DataType.BOOL -> sourceDatatype in NumericDatatypes
-            DataType.UBYTE -> sourceDatatype== DataType.UBYTE
+            DataType.BYTE -> sourceDatatype == DataType.BYTE || sourceDatatype == DataType.BOOL
-            DataType.WORD -> sourceDatatype== DataType.BYTE || sourceDatatype== DataType.UBYTE || sourceDatatype== DataType.WORD
+            DataType.UBYTE -> sourceDatatype == DataType.UBYTE || sourceDatatype == DataType.BOOL
-            DataType.UWORD -> sourceDatatype== DataType.UBYTE || sourceDatatype== DataType.UWORD
+            DataType.WORD -> sourceDatatype in setOf(DataType.BYTE, DataType.UBYTE, DataType.WORD, DataType.BOOL)
+            DataType.UWORD -> sourceDatatype == DataType.UBYTE || sourceDatatype == DataType.UWORD || sourceDatatype == DataType.BOOL
             DataType.FLOAT -> sourceDatatype in NumericDatatypes
             DataType.STR -> sourceDatatype == DataType.STR
             else -> {

compiler/src/prog8/compiler/astprocessing/AstExtensions.kt

@@ -6,10 +6,13 @@ import prog8.ast.expressions.CharLiteral
 import prog8.ast.expressions.IdentifierReference
 import prog8.ast.expressions.NumericLiteral
 import prog8.ast.statements.Directive
+import prog8.ast.statements.InlineAssembly
+import prog8.ast.statements.Subroutine
 import prog8.ast.statements.VarDeclOrigin
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.code.core.*
+import prog8.code.target.VMTarget
 
 
 internal fun Program.checkValid(errors: IErrorReporter, compilerOptions: CompilationOptions) {
@@ -21,6 +24,9 @@ internal fun Program.checkValid(errors: IErrorReporter, compilerOptions: Compila
 }
 
 internal fun Program.processAstBeforeAsmGeneration(compilerOptions: CompilationOptions, errors: IErrorReporter) {
+    val boolRemover = BoolRemover(this)
+    boolRemover.visit(this)
+    boolRemover.applyModifications()
     val fixer = BeforeAsmAstChanger(this, compilerOptions, errors)
     fixer.visit(this)
     while (errors.noErrors() && fixer.applyModifications() > 0) {
@@ -44,6 +50,14 @@ internal fun Program.reorderStatements(errors: IErrorReporter, options: Compilat
     }
 }
 
+internal fun Program.changeNotExpressionAndIfComparisonExpr(errors: IErrorReporter, target: ICompilationTarget) {
+    val changer = NotExpressionAndIfComparisonExprChanger(this, errors, target)
+    changer.visit(this)
+    while(errors.noErrors() && changer.applyModifications()>0) {
+        changer.visit(this)
+    }
+}
+
 internal fun Program.charLiteralsToUByteLiterals(target: ICompilationTarget, errors: IErrorReporter) {
     val walker = object : AstWalker() {
         override fun after(char: CharLiteral, parent: Node): Iterable<IAstModification> {
@@ -80,8 +94,8 @@ internal fun Program.verifyFunctionArgTypes(errors: IErrorReporter) {
     fixer.visit(this)
 }
 
-internal fun Program.preprocessAst(errors: IErrorReporter, target: ICompilationTarget) {
+internal fun Program.preprocessAst(errors: IErrorReporter, options: CompilationOptions) {
-    val transforms = AstPreprocessor(this, errors, target)
+    val transforms = AstPreprocessor(this, errors, options)
     transforms.visit(this)
     var mods = transforms.applyModifications()
     while(mods>0)
@@ -154,3 +168,17 @@ internal fun IdentifierReference.isSubroutineParameter(program: Program): Boolea
     }
     return false
 }
+
+internal fun Subroutine.hasRtsInAsm(compTarget: ICompilationTarget): Boolean {
+    val instructions =
+        if(compTarget.name == VMTarget.NAME)
+            listOf(" return", "\treturn", " jump", "\tjump")
+        else
+            listOf(" rti", "\trti", " rts", "\trts", " jmp", "\tjmp", " bra", "\tbra")
+    return statements
+        .asSequence()
+        .filterIsInstance<InlineAssembly>()
+        .any {
+            instructions.any { instr->instr in it.assembly }
+        }
+}

compiler/src/prog8/compiler/astprocessing/AstPreprocessor.kt

@@ -7,23 +7,68 @@ import prog8.ast.expressions.*
 import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
-import prog8.code.core.Encoding
+import prog8.code.core.*
-import prog8.code.core.ICompilationTarget
+import prog8.code.target.C64Target
-import prog8.code.core.IErrorReporter
+import prog8.code.target.Cx16Target
-import prog8.code.core.NumericDatatypes
+import prog8.code.target.VMTarget
 
 
-class AstPreprocessor(val program: Program, val errors: IErrorReporter, val compTarget: ICompilationTarget) : AstWalker() {
+class AstPreprocessor(val program: Program,
+                      val errors: IErrorReporter,
+                      val options: CompilationOptions) : AstWalker() {
+
+    override fun before(program: Program): Iterable<IAstModification> {
+        if(options.compTarget.name==C64Target.NAME) {
+            if(options.zeropage==ZeropageType.KERNALSAFE || options.zeropage==ZeropageType.FULL) {
+                // there is enough space in the zero page to put the cx16 virtual registers there.
+                // unfortunately, can't be the same address as CommanderX16.
+                relocateCx16VirtualRegisters(program, 0x0004u)
+            }
+        }
+        else if(options.compTarget.name !in setOf(Cx16Target.NAME, VMTarget.NAME)) {
+            relocateCx16VirtualRegisters(program, options.compTarget.machine.ESTACK_HI)
+        }
+        return noModifications
+    }
+
+    private fun relocateCx16VirtualRegisters(program: Program, baseAddress: UInt) {
+        // reset the address of the virtual registers to be inside the evaluation stack.
+        // (we don't do this on CommanderX16 itself as the registers have a fixed location in Zeropage there)
+        val cx16block = program.allBlocks.single { it.name == "cx16" }
+        val memVars = cx16block.statements
+            .filterIsInstance<VarDecl>()
+            .associateBy { it.name }
+
+        for (regnum in 0u..15u) {
+            val rX = memVars.getValue("r$regnum")
+            val rXL = memVars.getValue("r${regnum}L")
+            val rXH = memVars.getValue("r${regnum}H")
+            val rXs = memVars.getValue("r${regnum}s")
+            val rXsL = memVars.getValue("r${regnum}sL")
+            val rXsH = memVars.getValue("r${regnum}sH")
+            setAddress(rX, baseAddress + 2u * regnum)
+            setAddress(rXL, baseAddress + 2u * regnum)
+            setAddress(rXH, baseAddress + 2u * regnum + 1u)
+            setAddress(rXs, baseAddress + 2u * regnum)
+            setAddress(rXsL, baseAddress + 2u * regnum)
+            setAddress(rXsH, baseAddress + 2u * regnum + 1u)
+        }
+    }
+
+    private fun setAddress(vardecl: VarDecl, address: UInt) {
+        val oldAddr = vardecl.value as NumericLiteral
+        vardecl.value = NumericLiteral(oldAddr.type, address.toDouble(), oldAddr.position)
+    }
 
     override fun before(char: CharLiteral, parent: Node): Iterable<IAstModification> {
         if(char.encoding== Encoding.DEFAULT)
-            char.encoding = compTarget.defaultEncoding
+            char.encoding = options.compTarget.defaultEncoding
         return noModifications
     }
 
     override fun before(string: StringLiteral, parent: Node): Iterable<IAstModification> {
         if(string.encoding==Encoding.DEFAULT)
-            string.encoding = compTarget.defaultEncoding
+            string.encoding = options.compTarget.defaultEncoding
         return super.before(string, parent)
     }
 
@@ -98,6 +143,7 @@ class AstPreprocessor(val program: Program, val errors: IErrorReporter, val comp
             val containment = ContainmentCheck(expr.left, expr.right, expr.position)
             return listOf(IAstModification.ReplaceNode(expr, containment, parent))
         }
+
         return noModifications
     }
 

compiler/src/prog8/compiler/astprocessing/BeforeAsmAstChanger.kt

@@ -1,8 +1,11 @@
 package prog8.compiler.astprocessing
 
-import prog8.ast.*
+import prog8.ast.IStatementContainer
+import prog8.ast.Node
+import prog8.ast.Program
 import prog8.ast.base.FatalAstException
 import prog8.ast.expressions.*
+import prog8.ast.getTempVar
 import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
@@ -67,6 +70,10 @@ internal class BeforeAsmAstChanger(val program: Program,
         // Try to replace A = B <operator> Something  by A= B, A = A <operator> Something
         // this triggers the more efficent augmented assignment code generation more often.
         // But it can only be done if the target variable IS NOT OCCURRING AS AN OPERAND ITSELF.
+
+        if(options.compTarget.name==VMTarget.NAME)   // don't apply this optimization for Vm target
+            return noModifications
+
         if(!assignment.isAugmentable
             && assignment.target.identifier != null
             && !assignment.target.isIOAddress(options.compTarget.machine)) {
@@ -120,7 +127,6 @@ internal class BeforeAsmAstChanger(val program: Program,
     }
 
     override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
-
         // Most code generation targets only support subroutine inlining on asmsub subroutines
         // So we reset the flag here to be sure it doesn't cause problems down the line in the codegen.
         if(!subroutine.isAsmSubroutine && options.compTarget.name!=VMTarget.NAME)
@@ -132,7 +138,7 @@ internal class BeforeAsmAstChanger(val program: Program,
         // and if an assembly block doesn't contain a rts/rti, and some other situations.
         if (!subroutine.isAsmSubroutine) {
             if(subroutine.statements.isEmpty() ||
-                (subroutine.amountOfRtsInAsm() == 0
+                (!subroutine.hasRtsInAsm(options.compTarget)
                         && subroutine.statements.lastOrNull { it !is VarDecl } !is Return
                         && subroutine.statements.last() !is Subroutine
                         && subroutine.statements.last() !is Return)) {
@@ -158,10 +164,11 @@ internal class BeforeAsmAstChanger(val program: Program,
         }
 
         if (!subroutine.inline || !options.optimize) {
-            if (subroutine.isAsmSubroutine && subroutine.asmAddress==null && subroutine.amountOfRtsInAsm() == 0) {
+            if (subroutine.isAsmSubroutine && subroutine.asmAddress==null && !subroutine.hasRtsInAsm(options.compTarget)) {
                 // make sure the NOT INLINED asm subroutine actually has a rts at the end
                 // (non-asm routines get a Return statement as needed, above)
-                mods += IAstModification.InsertLast(InlineAssembly("  rts\n", Position.DUMMY), subroutine)
+                val instruction = if(options.compTarget.name==VMTarget.NAME) "  return\n" else "  rts\n"
+                mods += IAstModification.InsertLast(InlineAssembly(instruction, Position.DUMMY), subroutine)
             }
         }
 
@@ -169,21 +176,36 @@ internal class BeforeAsmAstChanger(val program: Program,
     }
 
     override fun after(ifElse: IfElse, parent: Node): Iterable<IAstModification> {
-        val prefixExpr = ifElse.condition as? PrefixExpression
+        val binExpr = ifElse.condition as? BinaryExpression
-        if(prefixExpr!=null && prefixExpr.operator=="not") {
+        if(binExpr==null) {
-            // if not x -> if x==0
+            // if x  ->  if x!=0
             val booleanExpr = BinaryExpression(
-                prefixExpr.expression,
+                ifElse.condition,
-                "==",
+                "!=",
                 NumericLiteral.optimalInteger(0, ifElse.condition.position),
                 ifElse.condition.position
             )
             return listOf(IAstModification.ReplaceNode(ifElse.condition, booleanExpr, ifElse))
         }
 
-        val binExpr = ifElse.condition as? BinaryExpression
+        if(binExpr.operator !in ComparisonOperators) {
-        if(binExpr==null || binExpr.operator !in ComparisonOperators) {
+            val constRight = binExpr.right.constValue(program)
-            // if x  ->  if x!=0,    if x+5  ->  if x+5 != 0
+            if(constRight!=null) {
+                if (binExpr.operator == "+") {
+                    // if x+5  ->  if x != -5
+                    val number = NumericLiteral(constRight.type, -constRight.number, constRight.position)
+                    val booleanExpr = BinaryExpression(binExpr.left,"!=", number, ifElse.condition.position)
+                    return listOf(IAstModification.ReplaceNode(ifElse.condition, booleanExpr, ifElse))
+                }
+                else if (binExpr.operator == "-") {
+                    // if x-5  ->  if x != 5
+                    val number = NumericLiteral(constRight.type, constRight.number, constRight.position)
+                    val booleanExpr = BinaryExpression(binExpr.left,"!=", number, ifElse.condition.position)
+                    return listOf(IAstModification.ReplaceNode(ifElse.condition, booleanExpr, ifElse))
+                }
+            }
+
+            // if x*5  ->  if x*5 != 0
             val booleanExpr = BinaryExpression(
                 ifElse.condition,
                 "!=",
@@ -197,84 +219,7 @@ internal class BeforeAsmAstChanger(val program: Program,
             (binExpr.right as? NumericLiteral)?.number!=0.0)
             throw InternalCompilerException("0==X should have been swapped to if X==0")
 
-        // simplify the conditional expression, introduce simple assignments if required.
+        return noModifications
-        // NOTE: sometimes this increases code size because additional stores/loads are generated for the
-        //       intermediate variables. We assume these are optimized away from the resulting assembly code later.
-        val simplify = simplifyConditionalExpression(binExpr)
-        val modifications = mutableListOf<IAstModification>()
-        if(simplify.rightVarAssignment!=null) {
-            modifications += IAstModification.ReplaceNode(binExpr.right, simplify.rightOperandReplacement!!, binExpr)
-            modifications += IAstModification.InsertBefore(
-                ifElse,
-                simplify.rightVarAssignment,
-                parent as IStatementContainer
-            )
-        }
-        if(simplify.leftVarAssignment!=null) {
-            modifications += IAstModification.ReplaceNode(binExpr.left, simplify.leftOperandReplacement!!, binExpr)
-            modifications += IAstModification.InsertBefore(
-                ifElse,
-                simplify.leftVarAssignment,
-                parent as IStatementContainer
-            )
-        }
-
-        return modifications
-    }
-
-    private class CondExprSimplificationResult(
-        val leftVarAssignment: Assignment?,
-        val leftOperandReplacement: Expression?,
-        val rightVarAssignment: Assignment?,
-        val rightOperandReplacement: Expression?
-    )
-
-    private fun simplifyConditionalExpression(expr: BinaryExpression): CondExprSimplificationResult {
-
-        // TODO: somehow figure out if the expr will result in stack-evaluation STILL after being split off,
-        //       in that case: do *not* split it off but just keep it as it is (otherwise code size increases)
-        // NOTE: do NOT move this to an earler ast transform phase (such as StatementReorderer or StatementOptimizer) - it WILL result in larger code.
-
-        if(options.compTarget.name==VMTarget.NAME)  // don't apply this optimization for Vm target
-            return CondExprSimplificationResult(null, null, null, null)
-
-        var leftAssignment: Assignment? = null
-        var leftOperandReplacement: Expression? = null
-        var rightAssignment: Assignment? = null
-        var rightOperandReplacement: Expression? = null
-
-        val separateLeftExpr = !expr.left.isSimple && expr.left !is IFunctionCall && expr.left !is ContainmentCheck
-        val separateRightExpr = !expr.right.isSimple && expr.right !is IFunctionCall && expr.right !is ContainmentCheck
-        val leftDt = expr.left.inferType(program)
-        val rightDt = expr.right.inferType(program)
-
-        if(!leftDt.isInteger || !rightDt.isInteger) {
-            // we can't reasonably simplify non-integer expressions
-            return CondExprSimplificationResult(null, null, null, null)
-        }
-
-        if(separateLeftExpr) {
-            val name = getTempRegisterName(leftDt)
-            leftOperandReplacement = IdentifierReference(name, expr.position)
-            leftAssignment = Assignment(
-                AssignTarget(IdentifierReference(name, expr.position), null, null, expr.position),
-                expr.left,
-                AssignmentOrigin.BEFOREASMGEN, expr.position
-            )
-        }
-        if(separateRightExpr) {
-            val (tempVarName, _) = program.getTempVar(rightDt.getOrElse { throw FatalAstException("invalid dt") }, true)
-            rightOperandReplacement = IdentifierReference(tempVarName, expr.position)
-            rightAssignment = Assignment(
-                AssignTarget(IdentifierReference(tempVarName, expr.position), null, null, expr.position),
-                expr.right,
-                AssignmentOrigin.BEFOREASMGEN, expr.position
-            )
-        }
-        return CondExprSimplificationResult(
-            leftAssignment, leftOperandReplacement,
-            rightAssignment, rightOperandReplacement
-        )
     }
 
     override fun after(arrayIndexedExpression: ArrayIndexedExpression, parent: Node): Iterable<IAstModification> {