don't allow ~ on booleans, also introduce SZ and SNZ instructions in IR to complete the conditional-set instruction list.

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

@@ -72,27 +72,13 @@ internal class ExpressionGen(private val codeGen: IRCodeGen) {
                 }
                 result
             }
-            is PtTypeCast -> {
+            is PtTypeCast -> translate(expr, resultRegister, resultFpRegister)
-                translate(expr, resultRegister, resultFpRegister)
+            is PtPrefix -> translate(expr, resultRegister, resultFpRegister)
-            }
+            is PtArrayIndexer -> translate(expr, resultRegister, resultFpRegister)
-            is PtPrefix -> {
+            is PtBinaryExpression -> translate(expr, resultRegister, resultFpRegister)
-                translate(expr, resultRegister, resultFpRegister)
+            is PtBuiltinFunctionCall -> codeGen.translateBuiltinFunc(expr, resultRegister)
-            }
+            is PtFunctionCall -> translate(expr, resultRegister, resultFpRegister)
-            is PtArrayIndexer -> {
+            is PtContainmentCheck -> translate(expr, resultRegister, resultFpRegister)
-                translate(expr, resultRegister, resultFpRegister)
-            }
-            is PtBinaryExpression -> {
-                translate(expr, resultRegister, resultFpRegister)
-            }
-            is PtBuiltinFunctionCall -> {
-                codeGen.translateBuiltinFunc(expr, resultRegister)
-            }
-            is PtFunctionCall -> {
-                translate(expr, resultRegister, resultFpRegister)
-            }
-            is PtContainmentCheck -> {
-                translate(expr, resultRegister, resultFpRegister)
-            }
             is PtRange,
             is PtArray,
             is PtString -> throw AssemblyError("range/arrayliteral/string should no longer occur as expression")
@@ -429,6 +415,11 @@ internal class ExpressionGen(private val codeGen: IRCodeGen) {
                         it += IRInstruction(Opcode.INV, vmDt, reg1 = resultRegister)
                     it += IRInstruction(Opcode.AND, vmDt, reg1 = resultRegister, value = 1)
                 }
+            } else {
+                if(constValue(binExpr.right)==0.0) {
+                    result += translateExpression(binExpr.left, resultRegister, -1)
+                    val opcode = if (notEquals) Opcode.SNZ else Opcode.SZ
+                    addInstr(result, IRInstruction(opcode, vmDt, reg1 = resultRegister, reg2 = resultRegister), null)
                 } else {
                     val rightResultReg = codeGen.registers.nextFree()
                     result += translateExpression(binExpr.left, resultRegister, -1)
@@ -437,6 +428,7 @@ internal class ExpressionGen(private val codeGen: IRCodeGen) {
                     addInstr(result, IRInstruction(opcode, vmDt, reg1 = resultRegister, reg2 = rightResultReg), null)
                 }
             }
+        }
         return result
     }
 

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

@@ -835,6 +835,8 @@ internal class AstChecker(private val program: Program,
         else if(expr.operator == "~") {
             if(dt !in IntegerDatatypes)
                 errors.err("can only use bitwise invert on integer types", expr.position)
+            if(dt==DataType.BOOL)
+                errors.err("bitwise invert is for integer types, use 'not' on booleans", expr.position)
         }
         super.visit(expr)
     }

docs/source/todo.rst

@@ -6,7 +6,6 @@ For next release
 - make sure bool value is always 0 or 1 (all casts should convert), then:
     - rewrite bool=bool^1 into bool=not bool
     - should solve: bool bb = not bb -> larger code than bool bb ^= 1
-    - should solve: bool xx = ~xx -> larger code than xx ^= 1
 
 
 ...

intermediate/src/prog8/intermediate/IRInstructions.kt

@@ -85,16 +85,18 @@ bgts        reg1, reg2,       address   - jump to location in program given by l
 bge         reg1, reg2,       address   - jump to location in program given by location, if reg1 >= reg2 (unsigned)
 bges        reg1, reg2,       address   - jump to location in program given by location, if reg1 >= reg2 (signed)
 ( NOTE: there are no blt/ble instructions because these are equivalent to bgt/bge with the operands swapped around.)
-seq         reg1, reg2                  - set reg=1 if reg1 == reg2,  otherwise set reg1=0
+sz          reg1, reg2                  - set reg1=1 if reg2==0,  otherwise set reg1=0
-sne         reg1, reg2                  - set reg=1 if reg1 != reg2,  otherwise set reg1=0
+snz         reg1, reg2                  - set reg1=1 if reg2!=0,  otherwise set reg1=0
-slt         reg1, reg2                  - set reg=1 if reg1 < reg2 (unsigned),  otherwise set reg1=0
+seq         reg1, reg2                  - set reg1=1 if reg1 == reg2,  otherwise set reg1=0
-slts        reg1, reg2                  - set reg=1 if reg1 < reg2 (signed),  otherwise set reg1=0
+sne         reg1, reg2                  - set reg1=1 if reg1 != reg2,  otherwise set reg1=0
-sle         reg1, reg2                  - set reg=1 if reg1 <= reg2 (unsigned),  otherwise set reg1=0
+slt         reg1, reg2                  - set reg1=1 if reg1 < reg2 (unsigned),  otherwise set reg1=0
-sles        reg1, reg2                  - set reg=1 if reg1 <= reg2 (signed),  otherwise set reg1=0
+slts        reg1, reg2                  - set reg1=1 if reg1 < reg2 (signed),  otherwise set reg1=0
-sgt         reg1, reg2                  - set reg=1 if reg1 > reg2 (unsigned),  otherwise set reg1=0
+sle         reg1, reg2                  - set reg1=1 if reg1 <= reg2 (unsigned),  otherwise set reg1=0
-sgts        reg1, reg2                  - set reg=1 if reg1 > reg2 (signed),  otherwise set reg1=0
+sles        reg1, reg2                  - set reg1=1 if reg1 <= reg2 (signed),  otherwise set reg1=0
-sge         reg1, reg2                  - set reg=1 if reg1 >= reg2 (unsigned),  otherwise set reg1=0
+sgt         reg1, reg2                  - set reg1=1 if reg1 > reg2 (unsigned),  otherwise set reg1=0
-sges        reg1, reg2                  - set reg=1 if reg1 >= reg2 (signed),  otherwise set reg1=0
+sgts        reg1, reg2                  - set reg1=1 if reg1 > reg2 (signed),  otherwise set reg1=0
+sge         reg1, reg2                  - set reg1=1 if reg1 >= reg2 (unsigned),  otherwise set reg1=0
+sges        reg1, reg2                  - set reg1=1 if reg1 >= reg2 (signed),  otherwise set reg1=0
 
 
 ARITHMETIC
@@ -253,6 +255,8 @@ enum class Opcode {
     BGTS,
     BGE,
     BGES,
+    SZ,
+    SNZ,
     SEQ,
     SNE,
     SLT,
@@ -569,6 +573,8 @@ val instructionFormats = mutableMapOf(
     Opcode.BGTS       to InstructionFormat.from("BW,<r1,<r2,<v"),
     Opcode.BGE        to InstructionFormat.from("BW,<r1,<r2,<v"),
     Opcode.BGES       to InstructionFormat.from("BW,<r1,<r2,<v"),
+    Opcode.SZ         to InstructionFormat.from("BW,>r1,<r2"),
+    Opcode.SNZ        to InstructionFormat.from("BW,>r1,<r2"),
     Opcode.SEQ        to InstructionFormat.from("BW,<>r1,<r2"),
     Opcode.SNE        to InstructionFormat.from("BW,<>r1,<r2"),
     Opcode.SLT        to InstructionFormat.from("BW,<>r1,<r2"),

virtualmachine/src/prog8/vm/VirtualMachine.kt

@@ -186,6 +186,8 @@ class VirtualMachine(irProgram: IRProgram) {
             Opcode.BGTS -> InsBGTS(ins)
             Opcode.BGE -> InsBGEU(ins)
             Opcode.BGES -> InsBGES(ins)
+            Opcode.SZ -> InsSZ(ins)
+            Opcode.SNZ -> InsSNZ(ins)
             Opcode.SEQ -> InsSEQ(ins)
             Opcode.SNE -> InsSNE(ins)
             Opcode.SLT -> InsSLT(ins)
@@ -782,6 +784,20 @@ class VirtualMachine(irProgram: IRProgram) {
             nextPc()
     }
 
+    private fun InsSZ(i: IRInstruction) {
+        val (_: Int, right: Int) = getSetOnConditionOperands(i)
+        val value = if(right==0) 1 else 0
+        setResultReg(i.reg1!!, value, i.type!!)
+        nextPc()
+    }
+
+    private fun InsSNZ(i: IRInstruction) {
+        val (_: Int, right: Int) = getSetOnConditionOperands(i)
+        val value = if(right!=0) 1 else 0
+        setResultReg(i.reg1!!, value, i.type!!)
+        nextPc()
+    }
+
     private fun InsSEQ(i: IRInstruction) {
         val (left: Int, right: Int) = getSetOnConditionOperands(i)
         val value = if(left==right) 1 else 0