Merge branch 'far-call-isolated-updates' into 'master'

Merging far calls...

See merge request camelot/kickc!47

.gitignore

@@ -1,3 +1,5 @@
+/gen
+**/.vscode/*
 */*.mon
 */*.vs
 */*.brk
@@ -5,11 +7,12 @@
 */*.sym
 */.tmpdirs
 */bin/
-/target/
+**/target/*
 */workspace.xml
 **/.DS_Store
 .project
 .tmpdirs
 **/.vscode/*.log
 /.idea/*
-kickc.iml
+kickc.iml
+/src/main/fragment/cache

src/main/antlr4/dk/camelot64/kickc/parser/KickCLexer.g4

@@ -75,6 +75,7 @@ LOCAL_RESERVE: '__zp_reserve' ;
 ADDRESS: '__address' ;
 ADDRESS_ZEROPAGE: '__zp' ;
 ADDRESS_MAINMEM: '__mem' ;
+BANK: '__bank' ;
 FORM_SSA: '__ssa' ;
 FORM_MA: '__ma' ;
 INTRINSIC: '__intrinsic' ;

src/main/antlr4/dk/camelot64/kickc/parser/KickCParser.g4

@@ -161,6 +161,7 @@ directive
     | EXTERN #directiveExtern
     | EXPORT #directiveExport
     | INLINE #directiveInline
+    | BANK PAR_BEGIN NAME COMMA NUMBER PAR_END #directiveBank
     | INTRINSIC #directiveIntrinsic
     | INTERRUPT ( PAR_BEGIN NAME PAR_END )? #directiveInterrupt
     | LOCAL_RESERVE PAR_BEGIN pragmaParam ( COMMA pragmaParam )* PAR_END  #directiveReserveZp

src/main/fragment/mos6502-common/call_phi_close_cx16_ram.asm

@@ -0,0 +1,11 @@
+sta $ff
+lda $0
+pha
+lda #{c1}
+sta $0
+lda $ff
+jsr {la1}
+sta $ff
+pla
+sta $0
+lda $ff

src/main/fragment/mos6502-common/call_phi_close_cx16_rom.asm

@@ -0,0 +1,11 @@
+sta $ff
+lda $1
+pha
+lda #{c1}
+sta $1
+lda $ff
+jsr {la1}
+sta $ff
+pla
+sta $1
+lda $ff

src/main/fragment/mos6502-common/call_phi_far_cx16_ram.asm

@@ -0,0 +1,4 @@
+jsr $FF6E
+.byte <{la1}
+.byte >{la1}
+.byte {c1}

src/main/fragment/mos6502-common/call_phi_far_cx16_rom.asm

@@ -0,0 +1,4 @@
+jsr $FF6E
+.byte <{la1}
+.byte >{la1}
+.byte {c1}

src/main/fragment/mos6502-common/call_phi_near.asm

@@ -0,0 +1 @@
+jsr {la1}

src/main/java/dk/camelot64/kickc/Compiler.java

@@ -224,6 +224,7 @@ public class Compiler {
       new Pass1Procedures(program).execute();
       new PassNTypeInference(program).execute();
       new PassNFixIntermediateMemoryArea(program).execute();
+      new Pass1FixProcedureParamSegment(program).execute();
       new PassNTypeIdSimplification(program).execute();
       new Pass1StructTypeSizeFix(program).execute();
       new Pass1PrintfIntrinsicRewrite(program).execute();

src/main/java/dk/camelot64/kickc/fragment/AsmFragmentInstanceSpecBuilder.java

@@ -13,7 +13,9 @@ import dk.camelot64.kickc.model.operators.OperatorBinary;
 import dk.camelot64.kickc.model.operators.OperatorUnary;
 import dk.camelot64.kickc.model.operators.Operators;
 import dk.camelot64.kickc.model.statements.*;
+import dk.camelot64.kickc.model.symbols.Bank;
 import dk.camelot64.kickc.model.symbols.Label;
+import dk.camelot64.kickc.model.symbols.Procedure;
 import dk.camelot64.kickc.model.symbols.Symbol;
 import dk.camelot64.kickc.model.types.SymbolType;
 import dk.camelot64.kickc.model.types.SymbolTypeInference;
@@ -41,6 +43,27 @@ final public class AsmFragmentInstanceSpecBuilder {
         return new AsmFragmentInstanceSpec(program, signature, bindings, codeScope);
     }
 
+    /**
+     * Create a fragment instance spec factory for a banked call
+     *
+     * @param toProcedure The procedure being called
+     * @param callingDistance The calling distance of the call
+     * @param program The program
+     * @return the fragment instance spec factory
+     */
+    public static AsmFragmentInstanceSpec callBanked(Procedure toProcedure, Bank.CallingDistance callingDistance, Program program) {
+        final Bank toBank = toProcedure.getBank();
+        AsmFragmentBindings bindings = new AsmFragmentBindings(program);
+        AsmFragmentSignature signature = new AsmFragmentSignature.CallBanked(
+              toProcedure.getCallingConvention().getShortName(),
+              callingDistance.toString(),
+              (callingDistance.equals(Bank.CallingDistance.NEAR)?null:toBank.bankArea()));
+        ScopeRef codeScope = program.getScope().getRef();
+        bindings.bind("c1", new ConstantInteger(toBank.bankNumber()));
+        bindings.bind("la1", new LabelRef(toProcedure.getFullName()));
+        return new AsmFragmentInstanceSpec(program, signature, bindings, codeScope);
+    }
+
     /**
      * Create a fragment instance spec factory for an interrupt routine entry
      *

src/main/java/dk/camelot64/kickc/fragment/AsmFragmentTemplate.java

@@ -143,6 +143,7 @@ public class AsmFragmentTemplate {
       if(signature.contains("c6")) bindings.put("c6", new ConstantInteger(360L));
       if(signature.contains("la1")) bindings.put("la1", new Label("@1", scope, true));
       if(signature.startsWith("call_")) bindings.put("la1", new Label("@1", scope, true));
+      if(signature.startsWith("call_")) bindings.put("c1", new ConstantInteger(400L));
       AsmFragmentInstance fragmentInstance =
             new AsmFragmentInstance(new Program(), signature, ScopeRef.ROOT, this, bindings);
       AsmProgram asm = new AsmProgram(targetCpu);

src/main/java/dk/camelot64/kickc/fragment/signature/AsmFragmentSignature.java

@@ -54,7 +54,7 @@ public interface AsmFragmentSignature {
     }
 
     /**
-     * ASM fragment signature for a conditional jump <code>if(A) goto B</code>.
+     * ASM fragment signature for a call
      */
     class Call implements AsmFragmentSignature {
 
@@ -70,6 +70,29 @@ public interface AsmFragmentSignature {
         }
     }
 
+    /**
+     * ASM fragment signature for a banked call
+     */
+    class CallBanked implements AsmFragmentSignature {
+
+        final private String callingConvention;
+
+        final private String callingDistance;
+
+        final private String toBankArea;
+
+        public CallBanked(String callingConvention, String callingDistance, String toBankArea) {
+            this.callingConvention = callingConvention;
+            this.callingDistance = callingDistance;
+            this.toBankArea = toBankArea;
+        }
+
+        @Override
+        public String getName() {
+            return "call_" + callingConvention + "_" + callingDistance + ((toBankArea==null)?"":("_"+toBankArea));
+        }
+    }
+
     /**
      * ASM fragment signature for a conditional jump <code>if(A) goto B</code>.
      */

src/main/java/dk/camelot64/kickc/model/Directive.java

@@ -43,6 +43,29 @@ public class Directive {
       public Inline() { super("inline"); }
    }
 
+   /**
+    * Bank to place code into. Used for determining call distance.
+    */
+   static public class Bank extends Directive {
+
+      private String bankArea;
+      private Long bankNumber;
+
+      public Bank(String bankArea, Long bankNumber) {
+         super("bank" );
+         this.bankArea = bankArea;
+         this.bankNumber = bankNumber;
+      }
+
+      public String getBankArea() {
+         return bankArea;
+      }
+
+      public Long getBankNumber() {
+         return bankNumber;
+      }
+   }
+
    /** Function declared intrinsic. */
    public static class Intrinsic extends Directive {
       public Intrinsic() { super("intrinsic"); }

src/main/java/dk/camelot64/kickc/model/symbols/Bank.java

@@ -0,0 +1,173 @@
+package dk.camelot64.kickc.model.symbols;
+
+/**
+ * <p>
+ * Specific target computer platforms implement a memory layout that can be banked either in ram or rom.
+ * This class models the capability to calculate which function call implementations are banked and which not.
+ * <br>Since banking implementations are specific to the target computer platform,
+ * specific assembler fragments are available in the compiler,
+ * that model the implementation of the banking, depending on:
+ *
+ * <ul>
+ * <li>the computer target computer <b><i>platform</i></b>.</li>
+ * <li>the bank <b><i>method</i></b> of function call implementation at the call location.</li>
+ * </ul>
+ *
+ * <p>The <b></b><i>method</i></b> can implement different banking implementations,
+ * depending on the required function call speed,
+ * the banking routine availability in the kernal (rom) of the target computer <b><i>platform</i></b>
+ * or even using specific designed banking routines by kickc to provide alternatives for banking methods.
+ * The <b><i>method</i></b> and the <b><i>platform</i></b> are the key combinations that select the fragments
+ * in kickc to generate the banked function call implementations used by the compiler.
+ *
+ * <p><br>Your C-code can be augmented with 3 new directives, that define which function(s) will be declared as banked:
+ *
+ * <br><ul>
+ *   <li><b>#pragma bank( <i>area</i>, <i>number</i> )</b> directive, defines for sequent functions
+ *   the the <b><i>area</i></b> and the bank <b><i>number</i></b>.</li>
+ *   <li>A new <b>#pragma nobank( dummy )</b> directive, resets the calculation of banking
+ *   for the sequent functions.</li>
+ *   <li><b>__bank( <i>area</i>, <i>number</i> )</b> directive, defines for one function a
+ *   target bank <b><i>area</i></b> and <b><i>number</i></b>.</li>
+ * </ul>
+ * <p>Examples of bank areas are different RAM and/or ROM areas at different
+ * zones in the linear memory addressing space, and may or may not overlap.
+ * Each banking area has its own configuration in the target computer platform and
+ * operate independently from each other.<br>
+ * For example, the Commander X16 has 256 RAM bank between 0xA000 and 0xBFFF and
+ * 256 ROM banks from 0xC000 till 0xFFFF. Each RAM bank is configured through zero page $00
+ * and each ROM bank is configured through zero page $01.
+ * The compiler configures for you these registers, depending on the configured banking area of the function,
+ * when a banked call is required.</p>
+ *
+ * <p><br>There are different types of function calls that can be implemented, depending on:
+ * <ul>
+ *     <li>the banked location of either or both the caller and/or the called function.</li>
+ *     <li>the banking area of either or both the caller and the called function.</li>
+ * </ul>
+ *
+ * <p>The <b>types of (banked) function call implementations</b> are:
+ * <ul>
+ *     <li><b>near</b> - jump to subroutine without any implementation of banking logic.</li>
+ *     <li><b>close</b> - jump to subroutine with inline banking implementation logic.</li>
+ *     <li><b>far</b> - jump to subroutine using a specific trampoline banking implementation logic.</li>
+ * </ul>
+ * Depending on the target platform of the system the <b>far</b> calls are likely the most complex
+ * and will consume the most CPU cycles. Therefore, careful design of the program flow and the
+ * placement of the functions in the banks need to be done, to avoid as much as possible these far calls.
+ *
+ * <p><br>The exact rules when <b>near</b>, <b>close</b> and <b>far</b> calls are implemented by the compiler,
+ * can be summarized in the following 6 cases:
+ *
+ * <ul>
+ *     <li><b>case #1</b> - If the caller function is <b>not banked</b>,<br>
+ *     and the called function is <b>not banked</b>,<br>
+ *     then a <b>near</b> call will be implemented.</li>
+ *     <li><b>case #2</b> - If the caller function is <b>not banked</b>,<br>
+ *     and the called function is <b>banked</b> in any bank in any banking area</b>,<br>
+ *     then a <b>close</b> call will be implemented.</li>
+ *     <li><b>case #3</b> - If the caller function is <b>banked</b> in any bank in any banking area,<br>
+ *     and the called function is <b>not banked</b>,<br>
+ *     then a <b>near</b> call will be implemented.</li>
+ *     <li><b>case #4</b> - If the caller function is <b>banked</b>,<br>
+ *     and the called function is <b>banked</b>,<br>
+ *     and both functions are <b>in the same bank</b> and <b>in the same bank area</b>,<br>
+ *     then a <b>near</b> call will be implemented.</li>
+ *     <li><b>case #5</b> - If the caller function is <b>banked</b>,<br>
+ *     and the called function is <b>banked</b>,<br>
+ *     and both functions are <b>in a different bank</b> but <b>in the same bank area</b>,<br>
+ *     then a <b>far</b> call will be implemented.</li>
+ *     <li><b>case #6</b> - If the caller function is <b>banked</b>,<br>
+ *     and the called function is <b>banked</b>,<br>
+ *     and both functions are <b>in any bank</b> but <b>in a different bank area</b>,<br>
+ *     then the a <b>close</b> call will be implemented.</li>
+ * </ul>
+ *
+ * <p>The usage of <b>#pragma code_seg( <i>segment</i> )</b> directive
+ * is very important! The <b>#pragma code_seg( <i>segment</i> )</b> directive utilization
+ * in harmony with the <b>#pragma bank( <i>method</i>, <i>number</i> )</b> directive
+ * makes the overall banking implementation work for your program.
+ *
+ * <p>
+ * <ul>
+ *     <li>KickC uses the <b>#pragma code_seg( <i>segment</i> )</b> directive to calculate the
+ *         <b>addressing</b> of the allocation of the function code within main or banked memory.</li>
+ *     <li>KickC uses the <b>#pragma bank( <i>method</i>, <i>number</i> )</b> directive or
+ *         <b>__bank( <i>method</i>, <i>number</i> )</b> directive to calculate the function call implementation
+ *         at the function calling locations!</li>
+ * </ul>
+ * <p>
+ * The KickC compiler contains several test cases and examples which demonstrate the usage of the banking system.
+ *
+ * @param bankArea The bankable area name.
+ * @param bankNumber The bank number.
+ */
+public record Bank(String bankArea, Long bankNumber) {
+
+   /**
+    * Creates a new Bank which collects the necessary data to handle banking.
+    * For example, on the Commander X16, RAM is banked from address 0xA000 till 0xBFFF.
+    * Zeropage 0x00 configures this banked RAM, with a number from 0x00 till 0xff.
+    * So "Banked RAM" is is a bankArea, and the bank is a configurable bank number in the bankArea.
+    *
+    * @param bankArea A bank area is a memory range that is banked on a target platform.
+    * @param bankNumber A bank is a number that defines a bank configuration in a bank area.
+    */
+   public Bank {
+   }
+
+   /** The common/shared bank which is always visible. */
+   public static Bank COMMON = new Bank("", 0L);
+
+   /**
+    * Is this the common/shared bank which is always visible.
+    * @return True if this is the common bank
+    */
+   public boolean isCommon() {
+      return COMMON.equals(this);
+   }
+
+   @Override
+   public String toString() {
+      if(isCommon()) {
+         return "";
+      } else {
+         return "__bank(" + this.bankArea() + ", " + this.bankNumber() + ") ";
+      }
+   }
+
+   /** The bank distance between a caller and callee, which will determine the type of call needed. */
+   public enum CallingDistance {
+      /** Caller and callee are both in the same bank or in the common bank. No bank change is needed.  */
+      NEAR,
+      /** Caller is in the common bank or a different banking area. A direct bank change is needed. */
+      CLOSE,
+      /** Caller and callee are different banks of the same banking area. A trampoline bank change is needed. */
+      FAR;
+
+      public static CallingDistance forCall(Bank from, Bank to) {
+         if(to.isCommon()) {
+            // NEAR: call to the common bank
+            return NEAR;
+         } else if(to.equals(from)) {
+            // NEAR: call to the same bank in the same banking area
+            return NEAR;
+         } else if(from.isCommon()) {
+            // CLOSE: call from common bank to any bank
+            return CLOSE;
+         } else if(!from.bankArea().equals(to.bankArea())) {
+            // CLOSE: from one banking area to another
+            return CLOSE;
+         } else {
+            // FAR:   banked to different bank in same bank area
+            return FAR;
+         }
+      }
+
+      @Override
+      public String toString() {
+         return name().toLowerCase();
+      }
+
+   }
+}

src/main/java/dk/camelot64/kickc/model/symbols/Procedure.java

@@ -33,14 +33,19 @@ public class Procedure extends Scope {
    private List<Comment> comments;
    /** Reserved zeropage addresses. */
    private List<Integer> reservedZps;
-   /** The code segment to put the procedure into. */
-   private String codeSegment;
+   /** The code segment to put the procedure code into. When null the procedure is not assigned to the code segment. */
+   private String segmentCode;
    /** The list of constructor procedures for this procedure. The constructor procedures are called during program initialization. */
    private final List<ProcedureRef> constructorRefs;
    /** Is this procedure declared as a constructor procedure. */
    private boolean isConstructor;
    /** The source of the procedure definition. */
    private StatementSource definitionSource;
+   /**
+    * The bank that the procedure code is placed in.
+    * Used to decide whether to produce near, close or far call code when generating calls.
+    */
+   private Bank bank;
 
    /** The names of all legal intrinsic procedures. */
    final public static List<String> INTRINSIC_PROCEDURES = Arrays.asList(
@@ -50,27 +55,42 @@ public class Procedure extends Scope {
          Pass1ByteXIntrinsicRewrite.INTRINSIC_MAKELONG4
    );
 
+   public Bank getBank() {
+      return bank;
+   }
+
+   public void setBank(Bank bank) {
+      this.bank = Objects.requireNonNull(bank);
+   }
+
    /** The method for passing parameters and return value to the procedure. */
    public enum CallingConvention {
       /** Parameters and return value handled through PHI-transitions. */
-      PHI_CALL("__phicall"),
+      PHI_CALL("__phicall", "phi"),
       /** Parameters and return value over the stack. */
-      STACK_CALL("__stackcall"),
+      STACK_CALL("__stackcall", "stack"),
       /** Parameters and return value handled through shared variables. */
-      VAR_CALL("__varcall"),
+      VAR_CALL("__varcall", "var"),
       /** Intrinsic calling. Will be converted to intrinsic ASM late in the compile. */
-      INTRINSIC_CALL("__intrinsiccall");
+      INTRINSIC_CALL("__intrinsiccall", "intrinsic");
 
       private final String name;
 
-      CallingConvention(String name) {
+      private final String shortName;
+
+      CallingConvention(String name, String shortName) {
          this.name = name;
+         this.shortName = shortName;
       }
 
       public String getName() {
          return name;
       }
 
+      public String getShortName() {
+         return shortName;
+      }
+
       /** Get a calling convention by name. */
       public static CallingConvention getCallingConvension(String name) {
          for(CallingConvention value : CallingConvention.values()) {
@@ -85,13 +105,14 @@ public class Procedure extends Scope {
    /** The calling convention used for this procedure. */
    private CallingConvention callingConvention;
 
-   public Procedure(String name, SymbolTypeProcedure procedureType, Scope parentScope, String codeSegment, String dataSegment, CallingConvention callingConvention) {
-      super(name, parentScope, dataSegment);
+   public Procedure(String name, SymbolTypeProcedure procedureType, Scope parentScope, String segmentCode, String segmentData, CallingConvention callingConvention, Bank bank) {
+      super(name, parentScope, segmentData);
       this.procedureType = procedureType;
       this.declaredInline = false;
+      this.bank = Objects.requireNonNull(bank);
       this.interruptType = null;
       this.comments = new ArrayList<>();
-      this.codeSegment = codeSegment;
+      this.segmentCode = Objects.requireNonNull(segmentCode);
       this.callingConvention = callingConvention;
       this.constructorRefs = new ArrayList<>();
       this.isConstructor = false;
@@ -113,12 +134,12 @@ public class Procedure extends Scope {
       this.callingConvention = callingConvention;
    }
 
-   public String getCodeSegment() {
-      return codeSegment;
+   public String getSegmentCode() {
+      return segmentCode;
    }
 
-   public void setCodeSegment(String codeSegment) {
-      this.codeSegment = codeSegment;
+   public void setSegmentCode(String segmentCode) {
+      this.segmentCode = segmentCode;
    }
 
    public List<String> getParameterNames() {
@@ -262,6 +283,7 @@ public class Procedure extends Scope {
       if(declaredIntrinsic) {
          res.append("__intrinsic ");
       }
+      res.append(bank.toString());
       if(!callingConvention.equals(CallingConvention.PHI_CALL)) {
          res.append(getCallingConvention().getName()).append(" ");
       }
@@ -307,13 +329,14 @@ public class Procedure extends Scope {
             Objects.equals(interruptType, procedure.interruptType) &&
             Objects.equals(comments, procedure.comments) &&
             Objects.equals(reservedZps, procedure.reservedZps) &&
-            Objects.equals(codeSegment, procedure.codeSegment) &&
+            Objects.equals(segmentCode, procedure.segmentCode) &&
             Objects.equals(constructorRefs, procedure.constructorRefs) &&
+            Objects.equals(bank, procedure.bank) &&
             callingConvention == procedure.callingConvention;
    }
 
    @Override
    public int hashCode() {
-      return Objects.hash(super.hashCode(), procedureType, parameterNames, variableLengthParameterList, declaredInline, declaredIntrinsic, interruptType, comments, reservedZps, codeSegment, constructorRefs, isConstructor, callingConvention);
+      return Objects.hash(super.hashCode(), procedureType, parameterNames, variableLengthParameterList, declaredInline, declaredIntrinsic, interruptType, comments, reservedZps, segmentCode, constructorRefs, isConstructor, bank, callingConvention);
    }
 }

src/main/java/dk/camelot64/kickc/model/symbols/Scope.java

@@ -30,7 +30,7 @@ public abstract class Scope implements Symbol {
       this.name = name;
       this.parentScope = parentScope;
       this.symbols = new LinkedHashMap<>();
-      this.segmentData = segmentData;
+      this.segmentData = Objects.requireNonNull(segmentData);
       setFullName();
    }
 
@@ -43,6 +43,10 @@ public abstract class Scope implements Symbol {
       return segmentData;
    }
 
+   public void setSegmentData(String segmentData) {
+      this.segmentData = segmentData;
+   }
+
    public HashMap<String, Symbol> getSymbols() {
       return symbols;
    }

src/main/java/dk/camelot64/kickc/parser/CParser.java

@@ -106,6 +106,14 @@ public class CParser {
      * The resource-file is copied to the output directory when compiling.
      */
     public static final String PRAGMA_RESOURCE = "resource";
+    /**
+     * #pragma bank(...) changes the current bank. Functions and variables will be placed in the specified bank.
+     */
+    public static final String PRAGMA_BANK = "bank";
+    /**
+     * #pragma nobank Changes the current bank to the default/common/shared bank.
+     */
+    public static final String PRAGMA_NOBANK = "nobank";
 
     /**
      * The Program.

src/main/java/dk/camelot64/kickc/passes/Pass0GenerateStatementSequence.java

@@ -16,7 +16,6 @@ import dk.camelot64.kickc.parser.KickCParserBaseVisitor;
 import dk.camelot64.kickc.passes.utils.SizeOfConstants;
 import org.antlr.v4.runtime.BufferedTokenStream;
 import org.antlr.v4.runtime.ParserRuleContext;
-import org.antlr.v4.runtime.RuleContext;
 import org.antlr.v4.runtime.Token;
 import org.antlr.v4.runtime.tree.ParseTree;
 import org.antlr.v4.runtime.tree.TerminalNode;
@@ -131,7 +130,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       Procedure initProc = program.getScope().getLocalProcedure(SymbolRef.INIT_PROC_NAME);
       if(initProc == null) {
          // Create the _init() procedure
-         initProc = new Procedure(SymbolRef.INIT_PROC_NAME, new SymbolTypeProcedure(SymbolType.VOID, new ArrayList<>()), program.getScope(), Scope.SEGMENT_CODE_DEFAULT, Scope.SEGMENT_DATA_DEFAULT, Procedure.CallingConvention.PHI_CALL);
+         initProc = new Procedure(SymbolRef.INIT_PROC_NAME, new SymbolTypeProcedure(SymbolType.VOID, new ArrayList<>()), program.getScope(), Scope.SEGMENT_CODE_DEFAULT, Scope.SEGMENT_DATA_DEFAULT, Procedure.CallingConvention.PHI_CALL, Bank.COMMON);
          initProc.setDeclaredInline(true);
          initProc.setParameters(new ArrayList<>());
          program.getScope().add(initProc);
@@ -188,7 +187,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       // Add the _start() procedure to the program
       {
          program.setStartProcedure(new ProcedureRef(SymbolRef.START_PROC_NAME));
-         final Procedure startProcedure = new Procedure(SymbolRef.START_PROC_NAME, new SymbolTypeProcedure(SymbolType.VOID, new ArrayList<>()), program.getScope(), Scope.SEGMENT_CODE_DEFAULT, Scope.SEGMENT_DATA_DEFAULT, Procedure.CallingConvention.PHI_CALL);
+         final Procedure startProcedure = new Procedure(SymbolRef.START_PROC_NAME, new SymbolTypeProcedure(SymbolType.VOID, new ArrayList<>()), program.getScope(), Scope.SEGMENT_CODE_DEFAULT, Scope.SEGMENT_DATA_DEFAULT, Procedure.CallingConvention.PHI_CALL, Bank.COMMON);
          startProcedure.setParameters(new ArrayList<>());
          program.getScope().add(startProcedure);
          final ProcedureCompilation startProcedureCompilation = program.createProcedureCompilation(startProcedure.getRef());
@@ -289,10 +288,24 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
             }
             break;
          case CParser.PRAGMA_CODE_SEG:
-            this.currentCodeSegment = pragmaParamName(pragmaParamSingle(ctx));
+            this.currentSegmentCode = pragmaParamName(pragmaParamSingle(ctx));
             break;
          case CParser.PRAGMA_DATA_SEG:
-            this.currentDataSegment = pragmaParamName(pragmaParamSingle(ctx));
+            this.currentSegmentData = pragmaParamName(pragmaParamSingle(ctx));
+            break;
+         case CParser.PRAGMA_BANK:
+            if(ctx.pragmaParam().size() != 2)
+               throw new CompileError("#pragma expects two parameters!", new StatementSource(ctx));
+            try {
+               final String pragmaBankArea = pragmaParamName(ctx.pragmaParam(0));
+               final Number pragmaBank = pragmaParamNumber(ctx.pragmaParam(1));
+               this.currentBank = new Bank(pragmaBankArea, pragmaBank.longValue());
+            } catch(IllegalArgumentException e) {
+               throw new CompileError("Illegal bank parameter " + ctx.getText(), new StatementSource(ctx));
+            }
+            break;
+         case CParser.PRAGMA_NOBANK:
+            this.currentBank = Bank.COMMON; // When the current segment is null, the procedure will not be declared as far.
             break;
          case CParser.PRAGMA_RESOURCE:
             String resourceFileName = pragmaParamString(pragmaParamSingle(ctx));
@@ -431,10 +444,13 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
    private Procedure.CallingConvention currentCallingConvention;
 
    /** The current code segment. */
-   private String currentCodeSegment = Scope.SEGMENT_CODE_DEFAULT;
+   private String currentSegmentCode = Scope.SEGMENT_CODE_DEFAULT;
 
    /** The current data segment. */
-   private String currentDataSegment = Scope.SEGMENT_DATA_DEFAULT;
+   private String currentSegmentData = Scope.SEGMENT_DATA_DEFAULT;
+
+   /** The current far segment. If null, the sequent procedures won't be banked. */
+   private Bank currentBank = Bank.COMMON;
 
    /** The current default interrupt type. */
    private String currentInterruptType;
@@ -491,7 +507,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
     */
    private Procedure declareProcedure(boolean defineProcedure, ParserRuleContext ctx, StatementSource statementSource) {
 
-      Procedure procedure = new Procedure(varDecl.getVarName(), (SymbolTypeProcedure) varDecl.getEffectiveType(), program.getScope(), currentCodeSegment, currentDataSegment, currentCallingConvention);
+      Procedure procedure = new Procedure(varDecl.getVarName(), (SymbolTypeProcedure) varDecl.getEffectiveType(), program.getScope(), currentSegmentCode, currentSegmentData, currentCallingConvention, currentBank);
       addDirectives(procedure, varDecl.getDeclDirectives(), statementSource);
       // Check if the declaration matches any existing declaration!
       final Symbol existingSymbol = program.getScope().getSymbol(procedure.getRef());
@@ -543,15 +559,19 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
             if(parameter.name == null)
                throw new CompileError("Illegal unnamed parameter.", statementSource);
 
-            VariableBuilder varBuilder = new VariableBuilder(parameter.name, getCurrentScope(), true, false, parameter.type, null, currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+            VariableBuilder varBuilder = new VariableBuilder(parameter.name, getCurrentScope(), true, false, parameter.type, null, currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
             final Variable paramVar = varBuilder.build();
             parameterList.add(paramVar);
          }
          procedure.setParameters(parameterList);
-         procedure.setCodeSegment(currentCodeSegment); // When a procedure is defined, the currentCodeSegment is to be set.
+         procedure.setSegmentData(currentSegmentData);
+         procedure.setSegmentCode(currentSegmentCode);
+         if(procedure.getBank().isCommon()) {
+            procedure.setBank(currentBank);
+         }
          // Add return variable
          if(!SymbolType.VOID.equals(procedure.getReturnType())) {
-            final VariableBuilder builder = new VariableBuilder("return", procedure, false, false, procedure.getReturnType(), varDecl.getDeclDirectives(), currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+            final VariableBuilder builder = new VariableBuilder("return", procedure, false, false, procedure.getReturnType(), varDecl.getDeclDirectives(), currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
             builder.build();
          }
          // exit the procedure
@@ -1026,7 +1046,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
             final List<Directive> effectiveDirectives = varDecl.getDeclDirectives();
             final List<Comment> declComments = varDecl.getDeclComments();
             varDecl.exitVar();
-            VariableBuilder varBuilder = new VariableBuilder(varName, getCurrentScope(), false, false, effectiveType, effectiveDirectives, currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+            VariableBuilder varBuilder = new VariableBuilder(varName, getCurrentScope(), false, false, effectiveType, effectiveDirectives, currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
             Variable variable = varBuilder.build();
             if(isStructMember && (initializer != null))
                throw new CompileError("Initializer not supported inside structs " + effectiveType.toCDecl(), declSource);
@@ -1136,7 +1156,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       ConstantArrayKickAsm constantArrayKickAsm = new ConstantArrayKickAsm(((SymbolTypePointer) varDecl.getEffectiveType()).getElementType(), kasm.kickAsmCode, kasm.uses, ((SymbolTypePointer) effectiveType).getArraySpec().getArraySize());
       // Add a constant variable
       Scope scope = getCurrentScope();
-      VariableBuilder varBuilder = new VariableBuilder(varName, scope, false, false, varDecl.getEffectiveType(), varDecl.getDeclDirectives(), currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+      VariableBuilder varBuilder = new VariableBuilder(varName, scope, false, false, varDecl.getEffectiveType(), varDecl.getDeclDirectives(), currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
       Variable variable = varBuilder.build();
       // Set constant value
       variable.setInitValue(getConstInitValue(constantArrayKickAsm, null, statementSource));
@@ -1171,6 +1191,9 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
          if(directive instanceof Directive.Inline) {
             procedure.setDeclaredInline(true);
             procedure.setCallingConvention(Procedure.CallingConvention.PHI_CALL);
+         } else if(directive instanceof Directive.Bank directiveBank) {
+            Bank bank = new Bank(directiveBank.getBankArea(), directiveBank.getBankNumber());
+            procedure.setBank(bank);
          } else if(directive instanceof Directive.CallingConvention) {
             procedure.setCallingConvention(((Directive.CallingConvention) directive).callingConvention);
          } else if(directive instanceof Directive.Interrupt) {
@@ -1214,6 +1237,13 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       return new Directive.Inline();
    }
 
+   @Override
+   public Object visitDirectiveBank(KickCParser.DirectiveBankContext ctx) {
+      String bankArea = ctx.NAME().getText();
+      Number bankNumber = NumberParser.parseLiteral(ctx.NUMBER().getText());
+      return new Directive.Bank(bankArea, bankNumber.longValue());
+   }
+
    @Override
    public Object visitDirectiveIntrinsic(KickCParser.DirectiveIntrinsicContext ctx) {
       return new Directive.Intrinsic();
@@ -1675,7 +1705,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       String varName = varDecl.getVarName();
       Variable lValue;
       if(varType != null) {
-         VariableBuilder varBuilder = new VariableBuilder(varName, blockScope, false, false, varType, varDecl.getDeclDirectives(), currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+         VariableBuilder varBuilder = new VariableBuilder(varName, blockScope, false, false, varType, varDecl.getDeclDirectives(), currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
          lValue = varBuilder.build();
       } else {
          lValue = getCurrentScope().findVariable(varName);
@@ -2010,7 +2040,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
          while(parentScope instanceof StructDefinition || parentScope instanceof TypeDefsScope)
             parentScope = parentScope.getScope();
          for(Variable member : enumDefinition.getAllConstants(false)) {
-            parentScope.add(Variable.createConstant(member.getLocalName(), SymbolType.BYTE, parentScope, member.getInitValue(), currentDataSegment));
+            parentScope.add(Variable.createConstant(member.getLocalName(), SymbolType.BYTE, parentScope, member.getInitValue(), currentSegmentData));
          }
          varDecl.setDeclType(SymbolType.BYTE);
          return null;
@@ -2045,7 +2075,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
             }
          }
       }
-      currentEnum.add(Variable.createConstant(memberName, SymbolType.BYTE, getCurrentScope(), enumValue, currentDataSegment));
+      currentEnum.add(Variable.createConstant(memberName, SymbolType.BYTE, getCurrentScope(), enumValue, currentSegmentData));
       return null;
    }
 
@@ -2227,7 +2257,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
       this.visit(ctx.declType());
       this.visit(ctx.declarator());
       String typedefName = varDecl.getVarName();
-      VariableBuilder varBuilder = new VariableBuilder(typedefName, getCurrentScope(), false, false, varDecl.getEffectiveType(), varDecl.getDeclDirectives(), currentDataSegment, program.getTargetPlatform().getVariableBuilderConfig());
+      VariableBuilder varBuilder = new VariableBuilder(typedefName, getCurrentScope(), false, false, varDecl.getEffectiveType(), varDecl.getDeclDirectives(), currentSegmentData, program.getTargetPlatform().getVariableBuilderConfig());
       varBuilder.build();
       scopeStack.pop();
       varDecl.exitType();
@@ -2478,7 +2508,7 @@ public class Pass0GenerateStatementSequence extends KickCParserBaseVisitor<Objec
                      new SymbolTypeProcedure(SymbolType.DWORD, Arrays.asList(new SymbolType[]{SymbolType.BYTE, SymbolType.BYTE, SymbolType.BYTE, SymbolType.BYTE})),
                      program.getScope(),
                      Scope.SEGMENT_CODE_DEFAULT, Scope.SEGMENT_DATA_DEFAULT,
-                     Procedure.CallingConvention.INTRINSIC_CALL);
+                     Procedure.CallingConvention.INTRINSIC_CALL, Bank.COMMON);
                makeword4.setDeclaredIntrinsic(true);
                final Variable hihi = new Variable("hihi", Variable.Kind.PHI_MASTER, SymbolType.BYTE, makeword4, Variable.MemoryArea.ZEROPAGE_MEMORY, Scope.SEGMENT_DATA_DEFAULT, null);
                makeword4.add(hihi);

src/main/java/dk/camelot64/kickc/passes/Pass1FixProcedureParamSegment.java

@@ -0,0 +1,46 @@
+package dk.camelot64.kickc.passes;
+
+import dk.camelot64.kickc.model.Program;
+import dk.camelot64.kickc.model.Registers;
+import dk.camelot64.kickc.model.symbols.Procedure;
+import dk.camelot64.kickc.model.symbols.Scope;
+import dk.camelot64.kickc.model.symbols.Variable;
+
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Ensure banked procedure parameters/return values in main memory are placed in the default data segment.
+ * This is needed to support banking, since it is otherwise impossible to access them across bank boundaries during calls.
+ */
+public class Pass1FixProcedureParamSegment extends Pass2SsaOptimization {
+
+   public Pass1FixProcedureParamSegment(Program program) {
+      super(program);
+   }
+
+   @Override
+   public boolean step() {
+      final Collection<Variable> allVariables = getScope().getAllVariables(true);
+      for(Variable variable : allVariables) {
+         if(variable.isKindLoadStore() || variable.isKindPhiMaster() || variable.isKindIntermediate()) {
+            if(variable.getRegister() instanceof Registers.RegisterMainMem registerMainMem && registerMainMem.isAddressHardcoded())
+               continue;
+            if(variable.getDataSegment().equals(Scope.SEGMENT_DATA_DEFAULT))
+               continue;
+            
+            final Scope scope = variable.getScope();
+            if(scope instanceof Procedure procedure) {
+               if(!procedure.getBank().isCommon()) {
+                  List<Variable> parameters = procedure.getParameters();
+                  if(parameters.contains(variable) || variable.getLocalName().equals("return")) {
+                     variable.setDataSegment(Scope.SEGMENT_DATA_DEFAULT);
+                     getLog().append("Fixing banked procedure parameter/return value to default segment " + variable.getFullName());
+                  }
+               }
+            }
+         }
+      }
+      return false;
+   }
+}

src/main/java/dk/camelot64/kickc/passes/Pass4CodeGeneration.java

@@ -115,7 +115,7 @@ public class Pass4CodeGeneration {
                 currentScope = block.getScope();
                 if (block.isProcedureEntry(program)) {
                     Procedure procedure = block.getProcedure(program);
-                    currentCodeSegmentName = procedure.getCodeSegment();
+                    currentCodeSegmentName = procedure.getSegmentCode();
                 }
                 setCurrentSegment(currentCodeSegmentName, asm);
                 asm.startChunk(currentScope, null, block.getLabel().getFullName());
@@ -219,7 +219,7 @@ public class Pass4CodeGeneration {
     }
 
     /**
-     * Generate a comment that describes the procedure signature and parameter transfer
+     * Generate a comment that describes the procedure signature and parameter transfer.
      *
      * @param asm       The assembler program being generated
      * @param procedure The procedure
@@ -240,6 +240,9 @@ public class Pass4CodeGeneration {
         if (i > 0) {
             asm.addComment(signature.toString(), false);
         }
+        if(!procedure.getBank().isCommon()) {
+            asm.addComment(" " + procedure.getBank(), false);
+        }
     }
 
     /**
@@ -853,14 +856,15 @@ public class Pass4CodeGeneration {
                 AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.conditionalJump((StatementConditionalJump) statement, block, program), program);
             } else if (statement instanceof StatementCall) {
                 StatementCall call = (StatementCall) statement;
-                Procedure procedure = getScope().getProcedure(call.getProcedure());
-                if (procedure.isDeclaredIntrinsic()) {
-                    if (Pass1ByteXIntrinsicRewrite.INTRINSIC_MAKELONG4.equals(procedure.getFullName())) {
+                Procedure toProcedure = getScope().getProcedure(call.getProcedure());
+                Procedure fromProcedure = block.getProcedure(this.program); // We obtain from where the procedure is called, to validate the bank equality.
+                if (toProcedure.isDeclaredIntrinsic()) {
+                    if (Pass1ByteXIntrinsicRewrite.INTRINSIC_MAKELONG4.equals(toProcedure.getFullName())) {
                         AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.makelong4(call, program), program);
                     } else {
-                        throw new CompileError("Intrinsic procedure not supported " + procedure.toString(program));
+                        throw new CompileError("Intrinsic procedure not supported " + toProcedure.toString(program));
                     }
-                } else if (Procedure.CallingConvention.PHI_CALL.equals(procedure.getCallingConvention())) {
+                } else if (Procedure.CallingConvention.PHI_CALL.equals(toProcedure.getCallingConvention())) {
                     // Generate PHI transition
                     if (genCallPhiEntry) {
                         ControlFlowBlock callSuccessor = getGraph().getCallSuccessor(block);
@@ -872,17 +876,44 @@ public class Pass4CodeGeneration {
                             genBlockPhiTransition(asm, block, callSuccessor, block.getScope());
                         }
                     }
-                    asm.addInstruction("jsr", CpuAddressingMode.ABS, call.getProcedure().getFullName(), false);
-                } else if (Procedure.CallingConvention.STACK_CALL.equals(procedure.getCallingConvention())) {
-                    asm.addInstruction("jsr", CpuAddressingMode.ABS, call.getProcedure().getFullName(), false);
+                    final Bank.CallingDistance callingDistance = Bank.CallingDistance.forCall(fromProcedure.getBank(), toProcedure.getBank());
+                    if(Bank.CallingDistance.NEAR.equals(callingDistance)) {
+                        asm.addInstruction("jsr", CpuAddressingMode.ABS, call.getProcedure().getFullName(), false);
+                    }  else {
+                        AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.callBanked(toProcedure, callingDistance, program), program);
+                    }
+                } else if (Procedure.CallingConvention.STACK_CALL.equals(toProcedure.getCallingConvention())) {
+                    final Bank.CallingDistance callingDistance = Bank.CallingDistance.forCall(fromProcedure.getBank(), toProcedure.getBank());
+                    if(Bank.CallingDistance.NEAR.equals(callingDistance)) {
+                        asm.addInstruction("jsr", CpuAddressingMode.ABS, call.getProcedure().getFullName(), false);
+                    } else {
+                        throw new CompileError("Stack Call procedure not supported in banked mode " + toProcedure.toString(program));
+                    }
                 }
             } else if (statement instanceof StatementCallExecute) {
                 StatementCallExecute call = (StatementCallExecute) statement;
-                RValue procedureRVal = call.getProcedureRVal();
-                // Generate ASM for a call
-                AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.call(call, indirectCallCount++, program), program);
-                if (!(procedureRVal instanceof ProcedureRef)) {
-                    asm.getCurrentChunk().setClobberOverwrite(CpuClobber.CLOBBER_ALL);
+                ProcedureRef procedureRef = call.getProcedure();
+                if(procedureRef != null) {
+                    ProgramScope scope = getScope();
+                    Procedure toProcedure = scope.getProcedure(procedureRef);
+                    Procedure fromProcedure = block.getProcedure(this.program);
+                    final Bank.CallingDistance callingDistance = Bank.CallingDistance.forCall(fromProcedure.getBank(), toProcedure.getBank());
+                    if(Bank.CallingDistance.NEAR.equals(callingDistance)) {
+                        AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.call(call, indirectCallCount++, program), program);
+                    } else {
+                        throw new CompileError("Stack Call procedure not supported in banked mode " + toProcedure.toString(program));
+                    }
+                    RValue procedureRVal = call.getProcedureRVal();
+                    if (!(procedureRVal instanceof ProcedureRef)) {
+                        asm.getCurrentChunk().setClobberOverwrite(CpuClobber.CLOBBER_ALL);
+                    }
+                } else {
+                    RValue procedureRVal = call.getProcedureRVal();
+                    // Generate ASM for a call
+                    AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.call(call, indirectCallCount++, program), program);
+                    if (!(procedureRVal instanceof ProcedureRef)) {
+                        asm.getCurrentChunk().setClobberOverwrite(CpuClobber.CLOBBER_ALL);
+                    }
                 }
             } else if (statement instanceof StatementExprSideEffect) {
                 AsmFragmentCodeGenerator.generateAsm(asm, AsmFragmentInstanceSpecBuilder.exprSideEffect((StatementExprSideEffect) statement, program), program);

src/main/java/dk/camelot64/kickc/passes/Pass4MemoryCoalesce.java

@@ -53,6 +53,7 @@ public abstract class Pass4MemoryCoalesce extends Pass2Base {
       return
             canCoalesceNotEqual(ec1, ec2) &&
                   canCoalesceCompatible(ec1, ec2, program) &&
+                  canCoalesceSegments(ec1, ec2, program) &&
                   canCoalesceVolatile(ec1, ec2, program) &&
                   canCoalesceThreads(ec1, ec2, threadHeads, program) &&
                   canCoalesceClobber(ec1, ec2, unknownFragments, program);
@@ -69,6 +70,21 @@ public abstract class Pass4MemoryCoalesce extends Pass2Base {
       return !ec1.equals(ec2);
    }
 
+   /**
+    * Determines if two live range equivalence classes are candidates for coalescing by ensuring they are not from different data segments.
+    * @param ec1 One equivalence class
+    * @param ec2 Another equivalence class
+    * @param program The program
+    * @return True if the two equivalence classes can be coalesced into one without problems.
+    */
+   private static boolean canCoalesceSegments(LiveRangeEquivalenceClass ec1, LiveRangeEquivalenceClass ec2, Program program) {
+      final VariableRef variableRef1 = ec1.getVariables().get(0);
+      final String dataSegment1 = program.getScope().getVar(variableRef1).getDataSegment();
+      final VariableRef variableRef2 = ec2.getVariables().get(0);
+      final String dataSegment2 = program.getScope().getVar(variableRef2).getDataSegment();
+      return dataSegment1.equals(dataSegment2);
+   }
+
    /**
     * Determines if two live range equivalence classes can be coalesced without cross-thread clobber.
     * This is possible if they are both only called from the same thread head.

src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java

@@ -767,6 +767,11 @@ public class TestProgramsFast extends TestPrograms {
       compileAndCompare("examples/cx16/cx16-rasterbars.c");
    }
 
+   //@Test
+   //public void testCx16Banking() throws IOException {
+   //   compileAndCompare("examples/cx16/banking/cx16-banking.c");
+   //}
+
    @Test
    public void testMega65Camelot1536Dots() throws IOException {
       compileAndCompare("examples/mega65/camelot-1536dots.c");
@@ -1516,6 +1521,83 @@ public class TestProgramsFast extends TestPrograms {
       compileAndCompare("declared-memory-var-0.c");
    }
 
+   @Test
+   public void testBankedPhiCase1Near0() throws IOException {
+      compileAndCompare("call-banked-phi-case-1-near-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase1Near1() throws IOException {
+      compileAndCompare("call-banked-phi-case-1-near-1.c");
+   }
+
+   @Test
+   public void testBankedPhiCase2Close0() throws IOException {
+      compileAndCompare("call-banked-phi-case-2-close-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase2Close1() throws IOException {
+      compileAndCompare("call-banked-phi-case-2-close-1.c");
+   }
+
+   @Test
+   public void testBankedPhiCase3Near0() throws IOException {
+      compileAndCompare("call-banked-phi-case-3-near-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase3Near1() throws IOException {
+      compileAndCompare("call-banked-phi-case-3-near-1.c");
+   }
+
+   @Test
+   public void testBankedPhiCase4Near0() throws IOException {
+      compileAndCompare("call-banked-phi-case-4-near-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase4Near1() throws IOException {
+      compileAndCompare("call-banked-phi-case-4-near-1.c");
+   }
+
+   @Test
+   public void testBankedPhiCase5Far0() throws IOException {
+      compileAndCompare("call-banked-phi-case-5-far-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase5Far1() throws IOException {
+      compileAndCompare("call-banked-phi-case-5-far-1.c");
+   }
+
+   @Test
+   public void testBankedPhiCase6Close0() throws IOException {
+      compileAndCompare("call-banked-phi-case-6-close-0.c");
+   }
+
+   @Test
+   public void testBankedPhiCase6Close1() throws IOException {
+      compileAndCompare("call-banked-phi-case-6-close-1.c");
+   }
+
+   @Test
+   public void testBankedPhiMemvars() throws IOException {
+      compileAndCompare("call-banked-phi-memvars.c");
+   }
+
+
+   @Test
+   public void testBankedStackCase2Close0() throws IOException {
+      assertError("call-banked-stack-case-2-close-0.c", "Stack Call procedure not supported in banked mode");
+   }
+
+   @Test
+   public void testBankedStackCase5Far0() throws IOException {
+      assertError("call-banked-stack-case-5-far-0.c", "Stack Call procedure not supported in banked mode");
+   }
+
+
    @Test
    public void testProcedureCallingConventionStack13() throws IOException {
       compileAndCompare("procedure-callingconvention-stack-13.c");

src/test/kc/call-banked-phi-case-1-near-0.c

@@ -0,0 +1,41 @@
+/**
+ * @file call-banked-phi-case-1-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be)
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // near call
+    SCREEN[1] = plus('1', 6); // near call
+}
+
+#pragma code_seg(Code)
+char plus(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-1-near-1.c

@@ -0,0 +1,46 @@
+/**
+ * @file call-banked-phi-case-1-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // near call
+    SCREEN[1] = plus('1', 6); // near call
+}
+
+#pragma code_seg(Code)
+char plus(char a, char b) {
+    return add(a, b); // near call
+}
+
+#pragma code_seg(Code)
+char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-2-close-0.c

@@ -0,0 +1,42 @@
+/**
+ * @file call-banked-phi-case-2-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+__bank(cx16_ram,1) char plus(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-2-close-1.c

@@ -0,0 +1,43 @@
+/**
+ * @file call-banked-phi-case-2-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char plus(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-3-near-0.c

@@ -0,0 +1,50 @@
+/**
+ * @file call-banked-phi-case-3-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+__bank(cx16_ram,1) char plus(char a, char b) {
+    return add(a, b); // near call
+}
+
+#pragma code_seg(Code)
+#pragma nobank
+char add(char a, char b) {
+    return a+b;
+}
+
+

src/test/kc/call-banked-phi-case-3-near-1.c

@@ -0,0 +1,51 @@
+/**
+ * @file call-banked-phi-case-3-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char plus(char a, char b) {
+    return add(a, b); // near call
+}
+
+#pragma code_seg(Code)
+#pragma nobank
+char add(char a, char b) {
+    return a+b;
+}
+
+

src/test/kc/call-banked-phi-case-4-near-0.c

@@ -0,0 +1,47 @@
+/**
+ * @file call-banked-phi-case-4-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+char __bank(cx16_ram, 1) plus(char a, char b) {
+    return add(a, b); // near call
+}
+
+#pragma code_seg(RAM_Bank1)
+char __bank(cx16_ram, 1) add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-4-near-1.c

@@ -0,0 +1,49 @@
+/**
+ * @file call-banked-phi-case-4-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char plus(char a, char b) {
+    return add(a, b); // near call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-5-far-0.c

@@ -0,0 +1,47 @@
+/**
+ * @file call-banked-phi-case-5-far-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+__bank(cx16_ram, 1) char plus(char a, char b) {
+    return add(a, b); // far call
+}
+
+#pragma code_seg(RAM_Bank2)
+__bank(cx16_ram, 2) char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-5-far-1.c

@@ -0,0 +1,49 @@
+/**
+ * @file call-banked-phi-case-5-far-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char plus(char a, char b) {
+    return add(a, b); // far call
+}
+
+#pragma code_seg(RAM_Bank2)
+#pragma bank(cx16_ram, 2)
+char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-6-close-0.c

@@ -0,0 +1,47 @@
+/**
+ * @file call-banked-phi-case-6-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+__bank(cx16_ram, 1) char plus(char a, char b) {
+    return add(a, b); // close call
+}
+
+#pragma code_seg(ROM_Bank1)
+__bank(cx16_rom, 1) char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-case-6-close-1.c

@@ -0,0 +1,49 @@
+/**
+ * @file call-banked-phi-case-6-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+    SCREEN[1] = plus('1', 6); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+char plus(char a, char b) {
+    return add(a, b); // close call
+}
+
+#pragma code_seg(ROM_Bank1)
+#pragma bank(cx16_rom, 1)
+char add(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-phi-memvars.c

@@ -0,0 +1,30 @@
+/**
+ * Test banked calls with memory variables.
+ * The parameters & return should end up in the shared/common bank.
+ */
+
+#pragma link("call-banked-phi.ld")
+#pragma var_model(mem)
+
+int* const SCREEN = (int*)0x0400;
+
+#pragma code_seg(Code)
+#pragma nobank
+void main(void) {
+    for(char i=0;i<5; i++) {
+        SCREEN[i] = plus(100, (int)i);
+        SCREEN[10+i] = plus(200, (int)i);
+    }
+}
+
+#pragma code_seg(RAM_Bank1)
+#pragma data_seg(RAM_Bank1)
+#pragma bank(cx16_ram, 1)
+int plus(int a,  int b) {
+    int r = 2;
+    r += a;
+    r += b;
+    r += a;
+    r += b;
+    return r;
+}

src/test/kc/call-banked-phi.ld

@@ -0,0 +1,13 @@
+.file                               [name="%O", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=%P]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(%E)
+.segment Code
+.segment Data
+

src/test/kc/call-banked-stack-case-2-close-0.c

@@ -0,0 +1,42 @@
+/**
+ * @file call-banked-stack-case-2-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2 
+ * The compiler will throw an error because the far call is a __stackcall
+ * and this is not (yet) implemented and supported. 
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-stack.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close stack call
+}
+
+#pragma code_seg(Bank1)
+__stackcall __bank(cx16_ram, 1) char plus(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-stack-case-5-far-0.c

@@ -0,0 +1,47 @@
+/**
+ * @file call-banked-stack-case-5-far-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * The compiler will throw an error because the far call is a __stackcall
+ * and this is not (yet) implemented and supported. 
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+
+#pragma link("call-banked-phi.ld")
+
+char* const SCREEN = (char*)0x0400;
+
+#pragma code_seg(Code)
+void main(void) {
+    SCREEN[0] = plus('0', 7); // close call
+}
+
+#pragma code_seg(RAM_Bank1)
+__bank(cx16_ram, 1) char plus(char a, char b) {
+    return min(a, b); // far call
+}
+
+#pragma code_seg(RAM_Bank2)
+__stackcall __bank(cx16_ram, 2) char min(char a, char b) {
+    return a+b;
+}

src/test/kc/call-banked-stack.ld

@@ -0,0 +1,13 @@
+.file                               [name="%O", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=%P]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(%E)
+.segment Code
+.segment Data
+

src/test/kc/examples/cx16/banking/cx16-banking.c

@@ -0,0 +1,164 @@
+/**
+ * @file cx16-banking-1.c
+ * @author your name (you@domain.com)
+ * @brief This program demonstrates a simple example of a banked call.
+ * @version 0.1
+ * @date 2023-04-05
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ */
+
+// The linker specification of the different segments.
+#pragma target(cx16)
+#pragma link("cx16-banking.ld")
+#pragma var_model(mem)
+
+#include <cx16.h>
+#include <conio.h>
+#include <printf.h>
+
+// The target computer platform is the Commander X16,
+// which implements banking in ram between 0xA0000 and 0xBFFF,
+// and in ram between 0xC000 and 0xFFFF.
+#pragma target(cx16)
+
+// Functional code
+
+#pragma code_seg(Bank1) // The sequent functions will be addressed specified by segment bank1 in the linker.
+#pragma bank(cx16_ram, 1)    // The sequent functions will be banked using call method ram in bank number 1.
+
+char add_a(char a) { 
+    printf("add_a(%02x), ", bank_get_bram());
+    return a+1; 
+}
+
+char add_c(char a) { 
+    printf("add_c(%02x), ", bank_get_bram());
+    return add_a(a)+1;               // Non banked call in ram bank 1. 
+}
+
+char add_d(char a) { 
+    printf("add_d(%02x), ",bank_get_bram());
+    return mul_a(a)+1;               // Banked call fram ram bank 1 to ram bank 2.
+}
+
+char add_e(char a) { 
+    printf("add_e(%02x), ",bank_get_bram());
+    return mul_b(a)+1;               // Banked call fram ram bank 1 to ram bank 2.
+}
+
+char add_f(char a) { 
+    printf("add_f(%02x), ",bank_get_bram());
+    return add_m(a)+1;                    // Non banked call fram ram bank 1 to main memory.
+}
+
+
+#pragma code_seg(Bank2) // The sequent functions will be addressed specified by segment bank2 in the linker.
+#pragma bank(cx16_ram, 2)    // The sequent functions will be banked using call method ram in bank number 2.
+
+char mul_a(char m) { 
+    printf("mul_a(%02x), ",bank_get_bram());
+    return m * 2;
+}
+
+char mul_c(char m) {
+    printf("mul_c(%02x), ",bank_get_bram());
+    return add_a(m)*2;              // Banked call fram ram bank 2 to ram bank 1.
+}
+
+char mul_d(char m) {
+    printf("mul_d(%02x), ",bank_get_bram());
+    return mul_a(m)*2;              // Non banked call in ram bank 2.
+}
+
+char mul_e(char a) { 
+    printf("mul_e(%02x), ",bank_get_bram());
+    return mul_b(a)*2;              // Non Banked call in ram bank 2.
+}
+
+char mul_f(char m) {
+    printf("mul_f(%02x), ",bank_get_bram());
+    return add_m(m)*2;                   // Non banked call fram ram bank 2 to main memory.
+}
+
+
+#pragma nobank // The sequent functions will consider no banking calculations anymore.
+
+#pragma code_seg(Bank1) // The sequent functions will be addressed specified by segment bank1 in the linker.
+// The __bank directive declares this function to be banked using call method ram in bank number 1 of banked ram.
+char __bank(cx16_ram, 1) add_b(char a) {
+    printf("add_b(%02x), ",bank_get_bram());
+    return a+1; 
+}
+
+#pragma code_seg(Bank2) // The sequent functions will be addressed specified by segment bank1 in the linker.
+// The __bank directive declares this function to be banked using call method ram in bank number 2 of banked ram.
+char __bank(cx16_ram, 2) mul_b(char m) {
+    printf("mul_b(%02x), ",bank_get_bram());
+    return m*2; 
+}
+
+#pragma code_seg(Code) // The sequent functions will be addressed in the default main memory location (segment Code).
+
+// Allocated in main memory.
+char add_m(char a) {
+    printf("add_m(%02x), ",bank_get_bram());
+    return add_e(a)+1; // Banked call to ram in bank 1 fram main memory.
+}
+
+// Allocated in main memory.
+char mul_m(char m) {
+    printf("mul_m(%02x), ",bank_get_bram());
+    return mul_e(m)*2; // Banked call to ram in bank 2 fram main memory.
+}
+
+
+// Practically this means that the main() function is placed in main memory ...
+
+void load_bank(char bank, char *file) {
+    bank_set_bram(bank);
+    cbm_k_setnam(file);
+    cbm_k_setlfs(1,8,2);
+    cbm_k_load((char*)0xA000, 0);
+    cbm_k_close(1);
+} 
+
+void main(void) {
+
+    clrscr();
+    
+    load_bank(1, "BANK1.BIN");
+    load_bank(2, "BANK2.BIN");
+
+    bank_set_bram(0);
+
+    asm{.byte $db}
+    printf("result = %u\n", add_a(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_b(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_c(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_d(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_e(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_f(1)); // Banked call to ram in bank 1 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_a(1)); // Banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_b(1)); // Banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_c(1)); // Banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_d(1)); // Banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_e(1)); // banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_f(1)); // banked call to ram in bank 2 fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", add_m(1));  // Near call in main memory fram main memory.
+    asm{.byte $db}
+    printf("result = %u\n", mul_m(1));  // Near call in main memory fram main memory.
+}

src/test/kc/examples/cx16/banking/cx16-banking.ld

@@ -0,0 +1,14 @@
+.file                               [name="%O", type="prg", segments="Program"]
+.file                               [name="BANK1.BIN", type="bin", segments="Bank1"]
+.file                               [name="BANK2.BIN", type="bin", segments="Bank2"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=%P]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef Bank1                   [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef Bank2                   [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segment Basic
+:BasicUpstart(%E)
+.segment Code
+.segment Data
+

src/test/ref/call-banked-phi-case-1-near-0.asm

@@ -0,0 +1,70 @@
+/**
+ * @file call-banked-phi-case-1-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be)
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-1-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    lda #7
+    ldx #'0'
+    jsr plus
+    // plus('0', 7)
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    lda #6
+    ldx #'1'
+    jsr plus
+    // plus('1', 6)
+    // SCREEN[1] = plus('1', 6)
+    // near call
+    sta SCREEN+1
+    // }
+    rts
+}
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // a+b
+    stx.z $ff
+    clc
+    adc.z $ff
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-1-near-0.cfg

@@ -0,0 +1,30 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return

src/test/ref/call-banked-phi-case-1-near-0.log

@@ -0,0 +1,462 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  plus::$0 = plus::a#2 + plus::b#2
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  plus::return#6 = phi( plus/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+void main()
+char main::$0
+char main::$1
+char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Successful SSA optimization Pass2AliasElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 11.0
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ plus::return#2 ]
+Allocated zp[1]:2 [ plus::a#2 ]
+Allocated zp[1]:3 [ plus::b#2 ]
+Allocated zp[1]:4 [ plus::return#0 ]
+Allocated zp[1]:5 [ main::$0 ]
+Allocated zp[1]:6 [ plus::return#1 ]
+Allocated zp[1]:7 [ main::$1 ]
+Allocated zp[1]:8 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [11] plus::return#2 = plus::a#2 + plus::b#2 [ plus::return#2 ] ( plus:1 [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  plus:5 [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:2 [ plus::a#2 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ plus::b#2 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ plus::return#0 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ main::$0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:6 [ plus::return#1 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ main::$1 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#2 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [plus] 11: zp[1]:2 [ plus::a#2 ] 11: zp[1]:3 [ plus::b#2 ] 4: zp[1]:4 [ plus::return#0 ] 4: zp[1]:6 [ plus::return#1 ] 3.75: zp[1]:8 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:5 [ main::$0 ] 4: zp[1]:7 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [plus] best 81 combination reg byte x [ plus::a#2 ] reg byte a [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:8 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 1024 possible.
+Uplifting [main] best 69 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 69 combination 
+Attempting to uplift remaining variables inzp[1]:8 [ plus::return#2 ]
+Uplifting [plus] best 60 combination reg byte a [ plus::return#2 ] 
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-1-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be)
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-1-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuaa=vbuc1 
+    lda #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- vbuxx=vbuc1 
+    ldx #'0'
+    jsr plus
+    // [2] plus::return#0 = plus::return#2
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuaa=vbuc1 
+    lda #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- vbuxx=vbuc1 
+    ldx #'1'
+    jsr plus
+    // [6] plus::return#1 = plus::return#2
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // near call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+  // plus
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuaa=vbuxx_plus_vbuaa 
+    stx.z $ff
+    clc
+    adc.z $ff
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [12] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte x 11.0
+char plus::b
+char plus::b#2 // reg byte a 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte a 3.75
+
+reg byte x [ plus::a#2 ]
+reg byte a [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte a [ plus::return#2 ]
+
+
+FINAL ASSEMBLER
+Score: 48
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-1-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be)
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-1-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuaa=vbuc1 
+    lda #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- vbuxx=vbuc1 
+    ldx #'0'
+    jsr plus
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuaa=vbuc1 
+    lda #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- vbuxx=vbuc1 
+    ldx #'1'
+    jsr plus
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // near call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+  // plus
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // a+b
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuaa=vbuxx_plus_vbuaa 
+    stx.z $ff
+    clc
+    adc.z $ff
+    // plus::@return
+    // }
+    // [12] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-1-near-0.sym

@@ -0,0 +1,21 @@
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte x 11.0
+char plus::b
+char plus::b#2 // reg byte a 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte a 3.75
+
+reg byte x [ plus::a#2 ]
+reg byte a [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte a [ plus::return#2 ]

src/test/ref/call-banked-phi-case-1-near-1.asm

@@ -0,0 +1,78 @@
+/**
+ * @file call-banked-phi-case-1-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-1-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    lda #7
+    ldx #'0'
+    jsr plus
+    // plus('0', 7)
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    lda #6
+    ldx #'1'
+    jsr plus
+    // plus('1', 6)
+    // SCREEN[1] = plus('1', 6)
+    // near call
+    sta SCREEN+1
+    // }
+    rts
+}
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // add(a, b)
+    stx.z add.a
+    jsr add
+    // }
+    rts
+}
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-1-near-1.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-1-near-1.log

@@ -0,0 +1,599 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 129 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 99 combination reg byte x [ plus::a#2 ] reg byte a [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 1024 possible.
+Uplifting [main] best 87 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 87 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 87 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 78 combination reg byte a [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-1-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-1-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuaa=vbuc1 
+    lda #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- vbuxx=vbuc1 
+    ldx #'0'
+    jsr plus
+    // [2] plus::return#0 = plus::return#2
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuaa=vbuc1 
+    lda #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- vbuxx=vbuc1 
+    ldx #'1'
+    jsr plus
+    // [6] plus::return#1 = plus::return#2
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // near call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+  // plus
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuxx 
+    stx.z add.a
+    // [12] add::b#0 = plus::b#2
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction __breturn:
+Succesful ASM optimization Pass5RedundantLabelElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte x 11.0
+char plus::b
+char plus::b#2 // reg byte a 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte a 3.75
+
+reg byte x [ plus::a#2 ]
+reg byte a [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte a [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 60
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-1-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #1
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-1-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuaa=vbuc1 
+    lda #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- vbuxx=vbuc1 
+    ldx #'0'
+    jsr plus
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuaa=vbuc1 
+    lda #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- vbuxx=vbuc1 
+    ldx #'1'
+    jsr plus
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // near call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+  // plus
+// __register(A) char plus(__register(X) char a, __register(A) char b)
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuxx 
+    stx.z add.a
+    // [12] add::b#0 = plus::b#2
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-1-near-1.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte x 11.0
+char plus::b
+char plus::b#2 // reg byte a 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte a 3.75
+
+reg byte x [ plus::a#2 ]
+reg byte a [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte a [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-2-close-0.asm

@@ -0,0 +1,96 @@
+/**
+ * @file call-banked-phi-case-2-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-2-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // a+b
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-2-close-0.cfg

@@ -0,0 +1,30 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return

src/test/ref/call-banked-phi-case-2-close-0.log

@@ -0,0 +1,520 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  plus::$0 = plus::a#2 + plus::b#2
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  plus::return#6 = phi( plus/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Successful SSA optimization Pass2AliasElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 11.0
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ plus::return#2 ]
+Allocated zp[1]:2 [ plus::a#2 ]
+Allocated zp[1]:3 [ plus::b#2 ]
+Allocated zp[1]:4 [ plus::return#0 ]
+Allocated zp[1]:5 [ main::$0 ]
+Allocated zp[1]:6 [ plus::return#1 ]
+Allocated zp[1]:7 [ main::$1 ]
+Allocated zp[1]:8 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:8 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::return#2 = plus::a#2 + plus::b#2 [ plus::return#2 ] ( plus:1 [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  plus:5 [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::return#2 = plus::a#2 + plus::b#2 [ plus::return#2 ] ( plus:1 [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  plus:5 [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:2 [ plus::a#2 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ plus::b#2 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ plus::return#0 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ main::$0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:6 [ plus::return#1 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ main::$1 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#2 ] : zp[1]:8 , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [plus] 11: zp[1]:2 [ plus::a#2 ] 11: zp[1]:3 [ plus::b#2 ] 4: zp[1]:4 [ plus::return#0 ] 4: zp[1]:6 [ plus::return#1 ] 3.75: zp[1]:8 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:5 [ main::$0 ] 4: zp[1]:7 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [plus] best 141 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:8 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 129 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 129 combination 
+Attempting to uplift remaining variables inzp[1]:8 [ plus::return#2 ]
+Uplifting [plus] best 126 combination reg byte x [ plus::return#2 ] 
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-2-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-2-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuxx=vbuaa_plus_vbuxx 
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [12] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte x [ plus::return#2 ]
+
+
+FINAL ASSEMBLER
+Score: 114
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-2-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-2-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // a+b
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuxx=vbuaa_plus_vbuxx 
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    // plus::@return
+    // }
+    // [12] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-2-close-0.sym

@@ -0,0 +1,21 @@
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte x [ plus::return#2 ]

src/test/ref/call-banked-phi-case-2-close-1.asm

@@ -0,0 +1,96 @@
+/**
+ * @file call-banked-phi-case-2-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-2-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // a+b
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-2-close-1.cfg

@@ -0,0 +1,30 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return

src/test/ref/call-banked-phi-case-2-close-1.log

@@ -0,0 +1,520 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  plus::$0 = plus::a#2 + plus::b#2
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  plus::return#6 = phi( plus/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Successful SSA optimization Pass2AliasElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] plus::return#2 = plus::a#2 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [12] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 11.0
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ plus::return#2 ]
+Allocated zp[1]:2 [ plus::a#2 ]
+Allocated zp[1]:3 [ plus::b#2 ]
+Allocated zp[1]:4 [ plus::return#0 ]
+Allocated zp[1]:5 [ main::$0 ]
+Allocated zp[1]:6 [ plus::return#1 ]
+Allocated zp[1]:7 [ main::$1 ]
+Allocated zp[1]:8 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:8 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::return#2 = plus::a#2 + plus::b#2 [ plus::return#2 ] ( plus:1 [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  plus:5 [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::return#2 = plus::a#2 + plus::b#2 [ plus::return#2 ] ( plus:1 [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  plus:5 [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:2 [ plus::a#2 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ plus::b#2 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ plus::return#0 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ main::$0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:6 [ plus::return#1 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ main::$1 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#2 ] : zp[1]:8 , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [plus] 11: zp[1]:2 [ plus::a#2 ] 11: zp[1]:3 [ plus::b#2 ] 4: zp[1]:4 [ plus::return#0 ] 4: zp[1]:6 [ plus::return#1 ] 3.75: zp[1]:8 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:5 [ main::$0 ] 4: zp[1]:7 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [plus] best 141 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:8 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 129 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 129 combination 
+Attempting to uplift remaining variables inzp[1]:8 [ plus::return#2 ]
+Uplifting [plus] best 126 combination reg byte x [ plus::return#2 ] 
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-2-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-2-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuxx=vbuaa_plus_vbuxx 
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [12] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte x [ plus::return#2 ]
+
+
+FINAL ASSEMBLER
+Score: 114
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-2-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #2.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-2-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // a+b
+    // [11] plus::return#2 = plus::a#2 + plus::b#2 -- vbuxx=vbuaa_plus_vbuxx 
+    stx.z $ff
+    clc
+    adc.z $ff
+    tax
+    // plus::@return
+    // }
+    // [12] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-2-close-1.sym

@@ -0,0 +1,21 @@
+__constant char * const SCREEN = (char *) 1024
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 11.0
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+reg byte x [ plus::return#2 ]

src/test/ref/call-banked-phi-case-3-near-0.asm

@@ -0,0 +1,106 @@
+/**
+ * @file call-banked-phi-case-3-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-3-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr add
+    tax
+    // }
+    rts
+}
+.segment Code
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-3-near-0.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-3-near-0.log

@@ -0,0 +1,660 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-3-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-3-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment Code
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-3-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-3-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment Code
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-3-near-0.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-3-near-1.asm

@@ -0,0 +1,106 @@
+/**
+ * @file call-banked-phi-case-3-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-3-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr add
+    tax
+    // }
+    rts
+}
+.segment Code
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-3-near-1.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-3-near-1.log

@@ -0,0 +1,660 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-3-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-3-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment Code
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-3-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #3.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-3-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment Code
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-3-near-1.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-4-near-0.asm

@@ -0,0 +1,106 @@
+/**
+ * @file call-banked-phi-case-4-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-4-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr add
+    tax
+    // }
+    rts
+}
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-4-near-0.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-4-near-0.log

@@ -0,0 +1,660 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-4-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-4-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-4-near-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-4-near-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-4-near-0.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-4-near-1.asm

@@ -0,0 +1,106 @@
+/**
+ * @file call-banked-phi-case-4-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-4-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr add
+    tax
+    // }
+    rts
+}
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-4-near-1.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-4-near-1.log

@@ -0,0 +1,660 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-4-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-4-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-4-near-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #4.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-4-near-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add
+    jsr add
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 1) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-4-near-1.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-5-far-0.asm

@@ -0,0 +1,110 @@
+/**
+ * @file call-banked-phi-case-5-far-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-5-far-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    tax
+    // }
+    rts
+}
+.segment RAM_Bank2
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-5-far-0.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-5-far-0.log

@@ -0,0 +1,668 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-5-far-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-5-far-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_far_cx16_ram 
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment RAM_Bank2
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-5-far-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-5-far-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_far_cx16_ram 
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment RAM_Bank2
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-5-far-0.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-5-far-1.asm

@@ -0,0 +1,110 @@
+/**
+ * @file call-banked-phi-case-5-far-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-5-far-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    tax
+    // }
+    rts
+}
+.segment RAM_Bank2
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-5-far-1.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-5-far-1.log

@@ -0,0 +1,668 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_ram, 2) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte a , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 189 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte a [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 256 possible.
+Uplifting [plus] best 161 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 149 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 149 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 149 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 146 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-5-far-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-5-far-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_far_cx16_ram 
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    // [14] add::return#0 = add::return#1
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment RAM_Bank2
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 128
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-5-far-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #5.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-5-far-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_far_cx16_ram 
+    jsr $ff6e
+    .byte <add
+    .byte >add
+    .byte 2
+    // [14] add::return#0 = add::return#1
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment RAM_Bank2
+  // add
+// __register(A) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_ram, 2) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuaa=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-5-far-1.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_ram, 2) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte a 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte a [ add::return#1 ]

src/test/ref/call-banked-phi-case-6-close-0.asm

@@ -0,0 +1,119 @@
+/**
+ * @file call-banked-phi-case-6-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-6-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    txa
+    tax
+    // }
+    rts
+}
+.segment ROM_Bank1
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    tax
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-6-close-0.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-6-close-0.log

@@ -0,0 +1,689 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] call add [ add::return#1 ] ( plus:1 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:4 [ add::return#1 ]
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] call add [ add::return#1 ] ( plus:1 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 223 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte x [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 192 possible.
+Uplifting [plus] best 195 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 183 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 183 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 183 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 180 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-6-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-6-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_close_cx16_rom 
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    // [14] add::return#0 = add::return#1 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment ROM_Bank1
+  // add
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuxx=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    tax
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte x 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte x [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 162
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-6-close-0.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the __bank() directive.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-6-close-0.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_close_cx16_rom 
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    // [14] add::return#0 = add::return#1 -- vbuaa=vbuxx 
+    txa
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment ROM_Bank1
+  // add
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuxx=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    tax
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-6-close-0.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte x 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte x [ add::return#1 ]

src/test/ref/call-banked-phi-case-6-close-1.asm

@@ -0,0 +1,119 @@
+/**
+ * @file call-banked-phi-case-6-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  .file                               [name="call-banked-phi-case-6-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    // plus('0', 7)
+    ldx #7
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    txa
+    // SCREEN[0] = plus('0', 7)
+    sta SCREEN
+    // plus('1', 6)
+    ldx #6
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    txa
+    // SCREEN[1] = plus('1', 6)
+    // close call
+    sta SCREEN+1
+    // }
+    rts
+}
+.segment RAM_Bank1
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    sta.z add.a
+    txa
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    txa
+    tax
+    // }
+    rts
+}
+.segment ROM_Bank1
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // a+b
+    clc
+    adc.z a
+    tax
+    // }
+    rts
+}

src/test/ref/call-banked-phi-case-6-close-1.cfg

@@ -0,0 +1,44 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return

src/test/ref/call-banked-phi-case-6-close-1.log

@@ -0,0 +1,689 @@
+Loading link script "call-banked-phi.ld"
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  plus::a#0 = '0'
+  plus::b#0 = 7
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@1
+main::@1: scope:[main]  from main
+  plus::return#4 = phi( main/plus::return#0 )
+  main::$0 = plus::return#4
+  SCREEN[0] = main::$0
+  plus::a#1 = '1'
+  plus::b#1 = 6
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  plus::return#5 = phi( main::@1/plus::return#1 )
+  main::$1 = plus::return#5
+  SCREEN[1] = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  plus::b#2 = phi( main/plus::b#0, main::@1/plus::b#1 )
+  plus::a#2 = phi( main/plus::a#0, main::@1/plus::a#1 )
+  add::a#0 = plus::a#2
+  add::b#0 = plus::b#2
+  call add
+  add::return#0 = add::return#2
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  add::return#3 = phi( plus/add::return#0 )
+  plus::$0 = add::return#3
+  plus::return#2 = plus::$0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  plus::return#6 = phi( plus::@1/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  add::b#1 = phi( plus/add::b#0 )
+  add::a#1 = phi( plus/add::a#0 )
+  add::$0 = add::a#1 + add::b#1
+  add::return#1 = add::$0
+  to:add::@return
+add::@return: scope:[add]  from add
+  add::return#4 = phi( add/add::return#1 )
+  add::return#2 = add::return#4
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant char * const SCREEN = (char *)$400
+void __start()
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::$0
+char add::a
+char add::a#0
+char add::a#1
+char add::b
+char add::b#0
+char add::b#1
+char add::return
+char add::return#0
+char add::return#1
+char add::return#2
+char add::return#3
+char add::return#4
+void main()
+char main::$0
+char main::$1
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::$0
+char plus::a
+char plus::a#0
+char plus::a#1
+char plus::a#2
+char plus::b
+char plus::b#0
+char plus::b#1
+char plus::b#2
+char plus::return
+char plus::return#0
+char plus::return#1
+char plus::return#2
+char plus::return#3
+char plus::return#4
+char plus::return#5
+char plus::return#6
+
+Adding number conversion cast (unumber) 7 in plus::b#0 = 7
+Adding number conversion cast (unumber) 0 in SCREEN[0] = main::$0
+Adding number conversion cast (unumber) 6 in plus::b#1 = 6
+Adding number conversion cast (unumber) 1 in SCREEN[1] = main::$1
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::b#0 = (unumber)7
+Inlining cast plus::b#1 = (unumber)6
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (char *) 1024
+Simplifying constant integer cast 7
+Simplifying constant integer cast 0
+Simplifying constant integer cast 6
+Simplifying constant integer cast 1
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 7
+Finalized unsigned number type (char) 0
+Finalized unsigned number type (char) 6
+Finalized unsigned number type (char) 1
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias add::return#0 = add::return#3 
+Alias plus::return#2 = plus::$0 plus::return#6 plus::return#3 
+Alias add::return#1 = add::$0 add::return#4 add::return#2 
+Successful SSA optimization Pass2AliasElimination
+Identical Phi Values add::a#1 add::a#0
+Identical Phi Values add::b#1 add::b#0
+Successful SSA optimization Pass2IdenticalPhiElimination
+Constant plus::a#0 = '0'
+Constant plus::b#0 = 7
+Constant plus::a#1 = '1'
+Constant plus::b#1 = 6
+Successful SSA optimization Pass2ConstantIdentification
+Simplifying expression containing zero SCREEN in [5] SCREEN[0] = main::$0
+Successful SSA optimization PassNSimplifyExpressionWithZero
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::b#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::b#1
+Constant inlined plus::b#1 = 6
+Constant inlined plus::b#0 = 7
+Constant inlined plus::a#1 = '1'
+Constant inlined plus::a#0 = '0'
+Successful SSA optimization Pass2ConstantInlining
+Consolidated array index constant in *(SCREEN+1)
+Successful SSA optimization Pass2ConstantAdditionElimination
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:1 plus:5 
+Calls in [plus] to add:13 
+
+Created 2 initial phi equivalence classes
+Coalesced down to 2 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  [1] call plus
+  [2] plus::return#0 = plus::return#2
+  to:main::@1
+main::@1: scope:[main]  from main
+  [3] main::$0 = plus::return#0
+  [4] *SCREEN = main::$0
+  [5] call plus
+  [6] plus::return#1 = plus::return#2
+  to:main::@2
+main::@2: scope:[main]  from main::@1
+  [7] main::$1 = plus::return#1
+  [8] *(SCREEN+1) = main::$1
+  to:main::@return
+main::@return: scope:[main]  from main::@2
+  [9] return 
+  to:@return
+
+__bank(cx16_ram, 1) char plus(char a , char b)
+plus: scope:[plus]  from main main::@1
+  [10] plus::b#2 = phi( main/7, main::@1/6 )
+  [10] plus::a#2 = phi( main/'0', main::@1/'1' )
+  [11] add::a#0 = plus::a#2
+  [12] add::b#0 = plus::b#2
+  [13] call add
+  [14] add::return#0 = add::return#1
+  to:plus::@1
+plus::@1: scope:[plus]  from plus
+  [15] plus::return#2 = add::return#0
+  to:plus::@return
+plus::@return: scope:[plus]  from plus::@1
+  [16] return 
+  to:@return
+
+__bank(cx16_rom, 1) char add(char a , char b)
+add: scope:[add]  from plus
+  [17] add::return#1 = add::a#0 + add::b#0
+  to:add::@return
+add::@return: scope:[add]  from add
+  [18] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // 56.0
+char add::b
+char add::b#0 // 112.0
+char add::return
+char add::return#0 // 22.0
+char add::return#1 // 37.33333333333333
+void main()
+char main::$0 // 4.0
+char main::$1 // 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // 11.0
+char plus::b
+char plus::b#2 // 5.5
+char plus::return
+char plus::return#0 // 4.0
+char plus::return#1 // 4.0
+char plus::return#2 // 3.75
+
+Initial phi equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$0 to live range equivalence class [ main::$0 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable add::a#0 to live range equivalence class [ add::a#0 ]
+Added variable add::b#0 to live range equivalence class [ add::b#0 ]
+Added variable add::return#0 to live range equivalence class [ add::return#0 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Added variable add::return#1 to live range equivalence class [ add::return#1 ]
+Complete equivalence classes
+[ plus::a#2 ]
+[ plus::b#2 ]
+[ plus::return#0 ]
+[ main::$0 ]
+[ plus::return#1 ]
+[ main::$1 ]
+[ add::a#0 ]
+[ add::b#0 ]
+[ add::return#0 ]
+[ plus::return#2 ]
+[ add::return#1 ]
+Allocated zp[1]:2 [ add::b#0 ]
+Allocated zp[1]:3 [ add::a#0 ]
+Allocated zp[1]:4 [ add::return#1 ]
+Allocated zp[1]:5 [ add::return#0 ]
+Allocated zp[1]:6 [ plus::a#2 ]
+Allocated zp[1]:7 [ plus::b#2 ]
+Allocated zp[1]:8 [ plus::return#0 ]
+Allocated zp[1]:9 [ main::$0 ]
+Allocated zp[1]:10 [ plus::return#1 ]
+Allocated zp[1]:11 [ main::$1 ]
+Allocated zp[1]:12 [ plus::return#2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:12 [ plus::return#2 ]
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] call add [ add::return#1 ] ( plus:1 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:4 [ add::return#1 ]
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [1] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ plus::return#2 ] (  [ plus::return#2 ] { { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] call add [ add::return#1 ] ( plus:1 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Statement [17] add::return#1 = add::a#0 + add::b#0 [ add::return#1 ] ( plus:1::add:13 [ add::return#1 ] { { plus::return#0 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  plus:5::add:13 [ add::return#1 ] { { plus::return#1 = plus::return#2 } { add::a#0 = plus::a#2 } { add::b#0 = plus::b#2 } { add::return#0 = add::return#1 } }  ) always clobbers reg byte a 
+Potential registers zp[1]:6 [ plus::a#2 ] : zp[1]:6 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:7 [ plus::b#2 ] : zp[1]:7 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:8 [ plus::return#0 ] : zp[1]:8 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:9 [ main::$0 ] : zp[1]:9 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:10 [ plus::return#1 ] : zp[1]:10 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:11 [ main::$1 ] : zp[1]:11 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ add::a#0 ] : zp[1]:3 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:2 [ add::b#0 ] : zp[1]:2 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:5 [ add::return#0 ] : zp[1]:5 , reg byte a , reg byte x , reg byte y , 
+Potential registers zp[1]:12 [ plus::return#2 ] : zp[1]:12 , reg byte x , reg byte y , 
+Potential registers zp[1]:4 [ add::return#1 ] : zp[1]:4 , reg byte x , reg byte y , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [add] 112: zp[1]:2 [ add::b#0 ] 56: zp[1]:3 [ add::a#0 ] 37.33: zp[1]:4 [ add::return#1 ] 22: zp[1]:5 [ add::return#0 ] 
+Uplift Scope [plus] 11: zp[1]:6 [ plus::a#2 ] 5.5: zp[1]:7 [ plus::b#2 ] 4: zp[1]:8 [ plus::return#0 ] 4: zp[1]:10 [ plus::return#1 ] 3.75: zp[1]:12 [ plus::return#2 ] 
+Uplift Scope [main] 4: zp[1]:9 [ main::$0 ] 4: zp[1]:11 [ main::$1 ] 
+Uplift Scope [] 
+
+Uplifting [add] best 223 combination reg byte a [ add::b#0 ] zp[1]:3 [ add::a#0 ] reg byte x [ add::return#1 ] reg byte a [ add::return#0 ] 
+Limited combination testing to 100 combinations of 192 possible.
+Uplifting [plus] best 195 combination reg byte a [ plus::a#2 ] reg byte x [ plus::b#2 ] reg byte a [ plus::return#0 ] reg byte a [ plus::return#1 ] zp[1]:12 [ plus::return#2 ] 
+Limited combination testing to 100 combinations of 768 possible.
+Uplifting [main] best 183 combination reg byte a [ main::$0 ] reg byte a [ main::$1 ] 
+Uplifting [] best 183 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ add::a#0 ]
+Uplifting [add] best 183 combination zp[1]:3 [ add::a#0 ] 
+Attempting to uplift remaining variables inzp[1]:12 [ plus::return#2 ]
+Uplifting [plus] best 180 combination reg byte x [ plus::return#2 ] 
+Allocated (was zp[1]:3) zp[1]:2 [ add::a#0 ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * @file call-banked-phi-case-6-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-6-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+  plus_from_main:
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // main::@1
+  __b1:
+    // [3] main::$0 = plus::return#0
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+  plus_from___b1:
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    jmp __b2
+    // main::@2
+  __b2:
+    // [7] main::$1 = plus::return#1
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_close_cx16_rom 
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    // [14] add::return#0 = add::return#1 -- vbuaa=vbuxx 
+    txa
+    jmp __b1
+    // plus::@1
+  __b1:
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [16] return 
+    rts
+}
+.segment ROM_Bank1
+  // add
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuxx=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    tax
+    jmp __breturn
+    // add::@return
+  __breturn:
+    // [18] return 
+    rts
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __b2
+Removing instruction jmp __breturn
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction plus_from_main:
+Removing instruction __b1:
+Removing instruction plus_from___b1:
+Removing instruction __b2:
+Removing instruction __breturn:
+Removing instruction __b1:
+Removing instruction __breturn:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte x 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte x [ add::return#1 ]
+
+
+FINAL ASSEMBLER
+Score: 162
+
+  // File Comments
+/**
+ * @file call-banked-phi-case-6-close-1.c
+ * @author Sven Van de Velde (sven.van.de.velde@telenet.be), 
+ * @author Jesper Gravgaard
+ * @brief Test a procedure with calling convention PHI - case #6.
+ * Implementation using the #pragma bank and nobank directives.
+ * @version 0.1
+ * @date 2023-04-11
+ * 
+ * @copyright Copyright (c) 2023
+ * 
+ * The following cases exist in banked calling implementations:
+ * 
+ *   - case #1 - unbanked to unbanked and no banking areas
+ *   - case #2 - unbanked to banked to any bank area
+ *   - case #3 - banked to unbanked from any bank area
+ *   - case #4 - banked to same bank in same bank area
+ *   - case #5 - banked to different bank in same bank area
+ *   - case #6 - banked to any bank between different bank areas
+ * 
+ * This brings us to the call types:
+ * 
+ *   - near = case #1, #3, #4
+ *   - close = case #2, #6
+ *   - far = case #5 
+ * 
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-case-6-close-1.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // plus('0', 7)
+    // [1] call plus
+    // [10] phi from main to plus [phi:main->plus]
+    // [10] phi plus::b#2 = 7 [phi:main->plus#0] -- vbuxx=vbuc1 
+    ldx #7
+    // [10] phi plus::a#2 = '0' [phi:main->plus#1] -- call_phi_close_cx16_ram 
+    lda #'0'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('0', 7)
+    // [2] plus::return#0 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@1
+    // [3] main::$0 = plus::return#0
+    // SCREEN[0] = plus('0', 7)
+    // [4] *SCREEN = main::$0 -- _deref_pbuc1=vbuaa 
+    sta SCREEN
+    // plus('1', 6)
+    // [5] call plus
+    // [10] phi from main::@1 to plus [phi:main::@1->plus]
+    // [10] phi plus::b#2 = 6 [phi:main::@1->plus#0] -- vbuxx=vbuc1 
+    ldx #6
+    // [10] phi plus::a#2 = '1' [phi:main::@1->plus#1] -- call_phi_close_cx16_ram 
+    lda #'1'
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus('1', 6)
+    // [6] plus::return#1 = plus::return#2 -- vbuaa=vbuxx 
+    txa
+    // main::@2
+    // [7] main::$1 = plus::return#1
+    // SCREEN[1] = plus('1', 6)
+    // [8] *(SCREEN+1) = main::$1 -- _deref_pbuc1=vbuaa 
+    // close call
+    sta SCREEN+1
+    // main::@return
+    // }
+    // [9] return 
+    rts
+}
+.segment RAM_Bank1
+  // plus
+// __register(X) char plus(__register(A) char a, __register(X) char b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // add(a, b)
+    // [11] add::a#0 = plus::a#2 -- vbuz1=vbuaa 
+    sta.z add.a
+    // [12] add::b#0 = plus::b#2 -- vbuaa=vbuxx 
+    txa
+    // [13] call add -- call_phi_close_cx16_rom 
+    sta.z $ff
+    lda.z 1
+    pha
+    lda #1
+    sta.z 1
+    lda.z $ff
+    jsr add
+    sta.z $ff
+    pla
+    sta.z 1
+    lda.z $ff
+    // [14] add::return#0 = add::return#1 -- vbuaa=vbuxx 
+    txa
+    // plus::@1
+    // [15] plus::return#2 = add::return#0 -- vbuxx=vbuaa 
+    tax
+    // plus::@return
+    // }
+    // [16] return 
+    rts
+}
+.segment ROM_Bank1
+  // add
+// __register(X) char add(__zp(2) char a, __register(A) char b)
+// __bank(cx16_rom, 1) 
+add: {
+    .label a = 2
+    // a+b
+    // [17] add::return#1 = add::a#0 + add::b#0 -- vbuxx=vbuz1_plus_vbuaa 
+    clc
+    adc.z a
+    tax
+    // add::@return
+    // }
+    // [18] return 
+    rts
+}
+  // File Data
+

src/test/ref/call-banked-phi-case-6-close-1.sym

@@ -0,0 +1,33 @@
+__constant char * const SCREEN = (char *) 1024
+__bank(cx16_rom, 1) char add(char a , char b)
+char add::a
+char add::a#0 // a zp[1]:2 56.0
+char add::b
+char add::b#0 // reg byte a 112.0
+char add::return
+char add::return#0 // reg byte a 22.0
+char add::return#1 // reg byte x 37.33333333333333
+void main()
+char main::$0 // reg byte a 4.0
+char main::$1 // reg byte a 4.0
+__bank(cx16_ram, 1) char plus(char a , char b)
+char plus::a
+char plus::a#2 // reg byte a 11.0
+char plus::b
+char plus::b#2 // reg byte x 5.5
+char plus::return
+char plus::return#0 // reg byte a 4.0
+char plus::return#1 // reg byte a 4.0
+char plus::return#2 // reg byte x 3.75
+
+reg byte a [ plus::a#2 ]
+reg byte x [ plus::b#2 ]
+reg byte a [ plus::return#0 ]
+reg byte a [ main::$0 ]
+reg byte a [ plus::return#1 ]
+reg byte a [ main::$1 ]
+zp[1]:2 [ add::a#0 ]
+reg byte a [ add::b#0 ]
+reg byte a [ add::return#0 ]
+reg byte x [ plus::return#2 ]
+reg byte x [ add::return#1 ]

src/test/ref/call-banked-phi-memvars.asm

@@ -0,0 +1,144 @@
+/**
+ * Test banked calls with memory variables.
+ * The parameters & return should end up in the shared/common bank.
+ */
+  .file                               [name="call-banked-phi-memvars.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  .label SCREEN = $400
+.segment Code
+main: {
+    ldy #0
+  __b1:
+    // for(char i=0;i<5; i++)
+    cpy #5
+    bcc __b2
+    // }
+    rts
+  __b2:
+    // plus(100, (int)i)
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    lda #<$64
+    sta plus.a
+    lda #>$64
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus(100, (int)i)
+    // SCREEN[i] = plus(100, (int)i)
+    tya
+    asl
+    tax
+    lda __1
+    sta SCREEN,x
+    lda __1+1
+    sta SCREEN+1,x
+    // 10+i
+    tya
+    tax
+    axs #-[$a]
+    // plus(200, (int)i)
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    lda #<$c8
+    sta plus.a
+    lda #>$c8
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus(200, (int)i)
+    // SCREEN[10+i] = plus(200, (int)i)
+    txa
+    asl
+    tax
+    lda __3
+    sta SCREEN,x
+    lda __3+1
+    sta SCREEN+1,x
+    // for(char i=0;i<5; i++)
+    iny
+    jmp __b1
+  .segment Data
+    .label __1 = plus.b
+    .label __3 = plus.b
+}
+.segment RAM_Bank1
+// __mem() int plus(__mem() int a, __mem() int b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // r += a
+    clc
+    lda a
+    adc #<2
+    sta r
+    lda a+1
+    adc #>2
+    sta r+1
+    // r += b
+    clc
+    lda r
+    adc b
+    sta r
+    lda r+1
+    adc b+1
+    sta r+1
+    // r += a
+    clc
+    lda r
+    adc a
+    sta r
+    lda r+1
+    adc a+1
+    sta r+1
+    // r += b
+    clc
+    lda return
+    adc r
+    sta return
+    lda return+1
+    adc r+1
+    sta return+1
+    // }
+    rts
+  .segment Data
+    b: .word 0
+    .label return = b
+  .segment RAM_Bank1
+    r: .word 0
+  .segment Data
+    a: .word 0
+}

src/test/ref/call-banked-phi-memvars.cfg

@@ -0,0 +1,45 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  to:main::@1
+main::@1: scope:[main]  from main main::@4
+  [1] main::i#2 = phi( main/0, main::@4/main::i#1 )
+  [2] if(main::i#2<5) goto main::@2
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [3] return 
+  to:@return
+main::@2: scope:[main]  from main::@1
+  [4] plus::b#0 = (int)main::i#2
+  [5] call plus
+  [6] plus::return#0 = plus::return#2
+  to:main::@3
+main::@3: scope:[main]  from main::@2
+  [7] main::$1 = plus::return#0
+  [8] main::$4 = main::i#2 << 1
+  [9] SCREEN[main::$4] = main::$1
+  [10] main::$2 = $a + main::i#2
+  [11] plus::b#1 = (int)main::i#2
+  [12] call plus
+  [13] plus::return#1 = plus::return#2
+  to:main::@4
+main::@4: scope:[main]  from main::@3
+  [14] main::$3 = plus::return#1
+  [15] main::$5 = main::$2 << 1
+  [16] SCREEN[main::$5] = main::$3
+  [17] main::i#1 = ++ main::i#2
+  to:main::@1
+
+__bank(cx16_ram, 1) int plus(int a , int b)
+plus: scope:[plus]  from main::@2 main::@3
+  [18] plus::b#2 = phi( main::@2/plus::b#0, main::@3/plus::b#1 )
+  [18] plus::a#2 = phi( main::@2/$64, main::@3/$c8 )
+  [19] plus::r#1 = 2 + plus::a#2
+  [20] plus::r#2 = plus::r#1 + plus::b#2
+  [21] plus::r#3 = plus::r#2 + plus::a#2
+  [22] plus::return#2 = plus::r#3 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [23] return 
+  to:@return

src/test/ref/call-banked-phi-memvars.log

@@ -0,0 +1,803 @@
+Loading link script "call-banked-phi.ld"
+Updating intermediate variable memory area to MAIN_MEMORY main::$0
+Updating intermediate variable memory area to MAIN_MEMORY main::$1
+Updating intermediate variable memory area to MAIN_MEMORY main::$2
+Updating intermediate variable memory area to MAIN_MEMORY main::$3
+Fixing banked procedure parameter/return value to default segment plus::a
+Fixing banked procedure parameter/return value to default segment plus::b
+Fixing banked procedure parameter/return value to default segment plus::return
+
+CONTROL FLOW GRAPH SSA
+
+void main()
+main: scope:[main]  from __start
+  main::i#0 = 0
+  to:main::@1
+main::@1: scope:[main]  from main main::@4
+  main::i#2 = phi( main/main::i#0, main::@4/main::i#1 )
+  main::$0 = main::i#2 < 5
+  if(main::$0) goto main::@2
+  to:main::@return
+main::@2: scope:[main]  from main::@1
+  main::i#3 = phi( main::@1/main::i#2 )
+  plus::a#0 = $64
+  plus::b#0 = (int)main::i#3
+  call plus
+  plus::return#0 = plus::return#3
+  to:main::@3
+main::@3: scope:[main]  from main::@2
+  main::i#4 = phi( main::@2/main::i#3 )
+  plus::return#4 = phi( main::@2/plus::return#0 )
+  main::$1 = plus::return#4
+  main::$4 = main::i#4 * SIZEOF_INT
+  SCREEN[main::$4] = main::$1
+  main::$2 = $a + main::i#4
+  plus::a#1 = $c8
+  plus::b#1 = (int)main::i#4
+  call plus
+  plus::return#1 = plus::return#3
+  to:main::@4
+main::@4: scope:[main]  from main::@3
+  main::i#5 = phi( main::@3/main::i#4 )
+  plus::return#5 = phi( main::@3/plus::return#1 )
+  main::$3 = plus::return#5
+  main::$5 = main::$2 * SIZEOF_INT
+  SCREEN[main::$5] = main::$3
+  main::i#1 = ++ main::i#5
+  to:main::@1
+main::@return: scope:[main]  from main::@1
+  return 
+  to:@return
+
+__bank(cx16_ram, 1) int plus(int a , int b)
+plus: scope:[plus]  from main::@2 main::@3
+  plus::b#2 = phi( main::@2/plus::b#0, main::@3/plus::b#1 )
+  plus::a#2 = phi( main::@2/plus::a#0, main::@3/plus::a#1 )
+  plus::r#0 = 2
+  plus::r#1 = plus::r#0 + plus::a#2
+  plus::r#2 = plus::r#1 + plus::b#2
+  plus::r#3 = plus::r#2 + plus::a#2
+  plus::r#4 = plus::r#3 + plus::b#2
+  plus::return#2 = plus::r#4
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  plus::return#6 = phi( plus/plus::return#2 )
+  plus::return#3 = plus::return#6
+  return 
+  to:@return
+
+void __start()
+__start: scope:[__start]  from
+  call main
+  to:__start::@1
+__start::@1: scope:[__start]  from __start
+  to:__start::@return
+__start::@return: scope:[__start]  from __start::@1
+  return 
+  to:@return
+
+SYMBOL TABLE SSA
+__constant int * const SCREEN = (int *)$400
+__constant char SIZEOF_INT = 2
+void __start()
+void main()
+bool main::$0
+int main::$1
+number main::$2
+int main::$3
+char main::$4
+number main::$5
+char main::i
+char main::i#0
+char main::i#1
+char main::i#2
+char main::i#3
+char main::i#4
+char main::i#5
+__bank(cx16_ram, 1) int plus(int a , int b)
+int plus::a
+int plus::a#0
+int plus::a#1
+int plus::a#2
+int plus::b
+int plus::b#0
+int plus::b#1
+int plus::b#2
+int plus::r
+int plus::r#0
+int plus::r#1
+int plus::r#2
+int plus::r#3
+int plus::r#4
+int plus::return
+int plus::return#0
+int plus::return#1
+int plus::return#2
+int plus::return#3
+int plus::return#4
+int plus::return#5
+int plus::return#6
+
+Adding number conversion cast (unumber) 5 in main::$0 = main::i#2 < 5
+Adding number conversion cast (snumber) $64 in plus::a#0 = $64
+Adding number conversion cast (unumber) $a in main::$2 = $a + main::i#4
+Adding number conversion cast (unumber) main::$2 in main::$2 = (unumber)$a + main::i#4
+Adding number conversion cast (snumber) $c8 in plus::a#1 = $c8
+Adding number conversion cast (unumber) main::$5 in main::$5 = main::$2 * SIZEOF_INT
+Successful SSA optimization PassNAddNumberTypeConversions
+Inlining cast plus::a#0 = (snumber)$64
+Inlining cast plus::a#1 = (snumber)$c8
+Successful SSA optimization Pass2InlineCast
+Simplifying constant pointer cast (int *) 1024
+Simplifying constant integer cast 5
+Simplifying constant integer cast $64
+Simplifying constant integer cast $a
+Simplifying constant integer cast $c8
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (char) 5
+Finalized signed number type (signed char) $64
+Finalized unsigned number type (char) $a
+Finalized signed number type (int) $c8
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Inferred type updated to char in main::$2 = $a + main::i#4
+Inferred type updated to char in main::$5 = main::$2 * SIZEOF_INT
+Alias main::i#2 = main::i#3 main::i#4 main::i#5 
+Alias plus::return#0 = plus::return#4 
+Alias plus::return#1 = plus::return#5 
+Alias plus::return#2 = plus::r#4 plus::return#6 plus::return#3 
+Successful SSA optimization Pass2AliasElimination
+Simple Condition main::$0 [3] if(main::i#2<5) goto main::@2
+Successful SSA optimization Pass2ConditionalJumpSimplification
+Constant main::i#0 = 0
+Constant plus::a#0 = $64
+Constant plus::a#1 = $c8
+Constant plus::r#0 = 2
+Successful SSA optimization Pass2ConstantIdentification
+Removing unused procedure __start
+Removing unused procedure block __start
+Removing unused procedure block __start::@1
+Removing unused procedure block __start::@return
+Successful SSA optimization PassNEliminateEmptyStart
+Rewriting multiplication to use shift [6] main::$4 = main::i#2 * SIZEOF_INT
+Rewriting multiplication to use shift [13] main::$5 = main::$2 * SIZEOF_INT
+Successful SSA optimization Pass2MultiplyToShiftRewriting
+Inlining constant with var siblings main::i#0
+Inlining constant with var siblings plus::a#0
+Inlining constant with var siblings plus::a#1
+Inlining constant with var siblings plus::r#0
+Constant inlined main::i#0 = 0
+Constant inlined plus::a#1 = $c8
+Constant inlined plus::r#0 = 2
+Constant inlined plus::a#0 = $64
+Successful SSA optimization Pass2ConstantInlining
+Eliminating unused constant SIZEOF_INT
+Successful SSA optimization PassNEliminateUnusedVars
+Adding NOP phi() at start of main
+CALL GRAPH
+Calls in [main] to plus:6 plus:14 
+
+Created 3 initial phi equivalence classes
+Coalesced [5] plus::b#3 = plus::b#0
+Coalesced [13] plus::b#4 = plus::b#1
+Coalesced [20] main::i#6 = main::i#1
+Coalesced down to 3 phi equivalence classes
+Adding NOP phi() at start of main
+
+FINAL CONTROL FLOW GRAPH
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  to:main::@1
+main::@1: scope:[main]  from main main::@4
+  [1] main::i#2 = phi( main/0, main::@4/main::i#1 )
+  [2] if(main::i#2<5) goto main::@2
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [3] return 
+  to:@return
+main::@2: scope:[main]  from main::@1
+  [4] plus::b#0 = (int)main::i#2
+  [5] call plus
+  [6] plus::return#0 = plus::return#2
+  to:main::@3
+main::@3: scope:[main]  from main::@2
+  [7] main::$1 = plus::return#0
+  [8] main::$4 = main::i#2 << 1
+  [9] SCREEN[main::$4] = main::$1
+  [10] main::$2 = $a + main::i#2
+  [11] plus::b#1 = (int)main::i#2
+  [12] call plus
+  [13] plus::return#1 = plus::return#2
+  to:main::@4
+main::@4: scope:[main]  from main::@3
+  [14] main::$3 = plus::return#1
+  [15] main::$5 = main::$2 << 1
+  [16] SCREEN[main::$5] = main::$3
+  [17] main::i#1 = ++ main::i#2
+  to:main::@1
+
+__bank(cx16_ram, 1) int plus(int a , int b)
+plus: scope:[plus]  from main::@2 main::@3
+  [18] plus::b#2 = phi( main::@2/plus::b#0, main::@3/plus::b#1 )
+  [18] plus::a#2 = phi( main::@2/$64, main::@3/$c8 )
+  [19] plus::r#1 = 2 + plus::a#2
+  [20] plus::r#2 = plus::r#1 + plus::b#2
+  [21] plus::r#3 = plus::r#2 + plus::a#2
+  [22] plus::return#2 = plus::r#3 + plus::b#2
+  to:plus::@return
+plus::@return: scope:[plus]  from plus
+  [23] return 
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+void main()
+int main::$1 // 11.0
+char main::$2 // 4.4
+int main::$3 // 11.0
+char main::$4 // 22.0
+char main::$5 // 22.0
+char main::i
+char main::i#1 // 22.0
+char main::i#2 // 3.6666666666666665
+__bank(cx16_ram, 1) int plus(int a , int b)
+int plus::a
+int plus::a#2 // 67.33333333333333
+int plus::b
+int plus::b#0 // 22.0
+int plus::b#1 // 22.0
+int plus::b#2 // 56.0
+int plus::r
+int plus::r#1 // 202.0
+int plus::r#2 // 202.0
+int plus::r#3 // 202.0
+int plus::return
+int plus::return#0 // 22.0
+int plus::return#1 // 22.0
+int plus::return#2 // 30.75
+
+Initial phi equivalence classes
+[ main::i#2 main::i#1 ]
+[ plus::a#2 ]
+[ plus::b#2 plus::b#0 plus::b#1 ]
+Added variable plus::return#0 to live range equivalence class [ plus::return#0 ]
+Added variable main::$1 to live range equivalence class [ main::$1 ]
+Added variable main::$4 to live range equivalence class [ main::$4 ]
+Added variable main::$2 to live range equivalence class [ main::$2 ]
+Added variable plus::return#1 to live range equivalence class [ plus::return#1 ]
+Added variable main::$3 to live range equivalence class [ main::$3 ]
+Added variable main::$5 to live range equivalence class [ main::$5 ]
+Added variable plus::r#1 to live range equivalence class [ plus::r#1 ]
+Added variable plus::r#2 to live range equivalence class [ plus::r#2 ]
+Added variable plus::r#3 to live range equivalence class [ plus::r#3 ]
+Added variable plus::return#2 to live range equivalence class [ plus::return#2 ]
+Complete equivalence classes
+[ main::i#2 main::i#1 ]
+[ plus::a#2 ]
+[ plus::b#2 plus::b#0 plus::b#1 ]
+[ plus::return#0 ]
+[ main::$1 ]
+[ main::$4 ]
+[ main::$2 ]
+[ plus::return#1 ]
+[ main::$3 ]
+[ main::$5 ]
+[ plus::r#1 ]
+[ plus::r#2 ]
+[ plus::r#3 ]
+[ plus::return#2 ]
+Allocated mem[2] [ plus::r#1 ]
+Allocated mem[2] [ plus::r#2 ]
+Allocated mem[2] [ plus::r#3 ]
+Allocated mem[2] [ plus::b#2 plus::b#0 plus::b#1 ]
+Allocated mem[2] [ plus::a#2 ]
+Allocated mem[2] [ plus::return#2 ]
+Allocated mem[1] [ main::i#2 main::i#1 ]
+Allocated mem[2] [ plus::return#0 ]
+Allocated mem[1] [ main::$4 ]
+Allocated mem[2] [ plus::return#1 ]
+Allocated mem[1] [ main::$5 ]
+Allocated mem[2] [ main::$1 ]
+Allocated mem[2] [ main::$3 ]
+Allocated mem[1] [ main::$2 ]
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [4] plus::b#0 = (int)main::i#2 [ main::i#2 plus::b#0 ] (  [ main::i#2 plus::b#0 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for mem[1] [ main::i#2 main::i#1 ]
+Statement [5] call plus [ main::i#2 plus::return#2 ] (  [ main::i#2 plus::return#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [6] plus::return#0 = plus::return#2 [ main::i#2 plus::return#0 ] (  [ main::i#2 plus::return#0 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [7] main::$1 = plus::return#0 [ main::i#2 main::$1 ] (  [ main::i#2 main::$1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [8] main::$4 = main::i#2 << 1 [ main::i#2 main::$1 main::$4 ] (  [ main::i#2 main::$1 main::$4 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [9] SCREEN[main::$4] = main::$1 [ main::i#2 ] (  [ main::i#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [10] main::$2 = $a + main::i#2 [ main::i#2 main::$2 ] (  [ main::i#2 main::$2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::b#1 = (int)main::i#2 [ main::i#2 main::$2 plus::b#1 ] (  [ main::i#2 main::$2 plus::b#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for mem[1] [ main::$2 ]
+Statement [12] call plus [ main::i#2 plus::return#2 main::$2 ] (  [ main::i#2 plus::return#2 main::$2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] plus::return#1 = plus::return#2 [ main::i#2 main::$2 plus::return#1 ] (  [ main::i#2 main::$2 plus::return#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [14] main::$3 = plus::return#1 [ main::i#2 main::$2 main::$3 ] (  [ main::i#2 main::$2 main::$3 ] { }  ) always clobbers reg byte a 
+Statement [15] main::$5 = main::$2 << 1 [ main::i#2 main::$3 main::$5 ] (  [ main::i#2 main::$3 main::$5 ] { }  ) always clobbers reg byte a 
+Statement [16] SCREEN[main::$5] = main::$3 [ main::i#2 ] (  [ main::i#2 ] { }  ) always clobbers reg byte a 
+Statement [19] plus::r#1 = 2 + plus::a#2 [ plus::a#2 plus::b#2 plus::r#1 ] ( plus:5 [ main::i#2 plus::a#2 plus::b#2 plus::r#1 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::a#2 plus::b#2 plus::r#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [20] plus::r#2 = plus::r#1 + plus::b#2 [ plus::a#2 plus::b#2 plus::r#2 ] ( plus:5 [ main::i#2 plus::a#2 plus::b#2 plus::r#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::a#2 plus::b#2 plus::r#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [21] plus::r#3 = plus::r#2 + plus::a#2 [ plus::b#2 plus::r#3 ] ( plus:5 [ main::i#2 plus::b#2 plus::r#3 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::b#2 plus::r#3 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [22] plus::return#2 = plus::r#3 + plus::b#2 [ plus::return#2 ] ( plus:5 [ main::i#2 plus::return#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::return#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [4] plus::b#0 = (int)main::i#2 [ main::i#2 plus::b#0 ] (  [ main::i#2 plus::b#0 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [5] call plus [ main::i#2 plus::return#2 ] (  [ main::i#2 plus::return#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [6] plus::return#0 = plus::return#2 [ main::i#2 plus::return#0 ] (  [ main::i#2 plus::return#0 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [7] main::$1 = plus::return#0 [ main::i#2 main::$1 ] (  [ main::i#2 main::$1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [8] main::$4 = main::i#2 << 1 [ main::i#2 main::$1 main::$4 ] (  [ main::i#2 main::$1 main::$4 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [9] SCREEN[main::$4] = main::$1 [ main::i#2 ] (  [ main::i#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [10] main::$2 = $a + main::i#2 [ main::i#2 main::$2 ] (  [ main::i#2 main::$2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [11] plus::b#1 = (int)main::i#2 [ main::i#2 main::$2 plus::b#1 ] (  [ main::i#2 main::$2 plus::b#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [12] call plus [ main::i#2 plus::return#2 main::$2 ] (  [ main::i#2 plus::return#2 main::$2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [13] plus::return#1 = plus::return#2 [ main::i#2 main::$2 plus::return#1 ] (  [ main::i#2 main::$2 plus::return#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [14] main::$3 = plus::return#1 [ main::i#2 main::$2 main::$3 ] (  [ main::i#2 main::$2 main::$3 ] { }  ) always clobbers reg byte a 
+Statement [15] main::$5 = main::$2 << 1 [ main::i#2 main::$3 main::$5 ] (  [ main::i#2 main::$3 main::$5 ] { }  ) always clobbers reg byte a 
+Statement [16] SCREEN[main::$5] = main::$3 [ main::i#2 ] (  [ main::i#2 ] { }  ) always clobbers reg byte a 
+Statement [19] plus::r#1 = 2 + plus::a#2 [ plus::a#2 plus::b#2 plus::r#1 ] ( plus:5 [ main::i#2 plus::a#2 plus::b#2 plus::r#1 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::a#2 plus::b#2 plus::r#1 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [20] plus::r#2 = plus::r#1 + plus::b#2 [ plus::a#2 plus::b#2 plus::r#2 ] ( plus:5 [ main::i#2 plus::a#2 plus::b#2 plus::r#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::a#2 plus::b#2 plus::r#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [21] plus::r#3 = plus::r#2 + plus::a#2 [ plus::b#2 plus::r#3 ] ( plus:5 [ main::i#2 plus::b#2 plus::r#3 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::b#2 plus::r#3 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Statement [22] plus::return#2 = plus::r#3 + plus::b#2 [ plus::return#2 ] ( plus:5 [ main::i#2 plus::return#2 ] { { plus::b#0 = plus::b#2 } { plus::return#0 = plus::return#2 } }  plus:12 [ main::i#2 main::$2 plus::return#2 ] { { plus::b#1 = plus::b#2 } { plus::return#1 = plus::return#2 } }  ) always clobbers reg byte a 
+Potential registers mem[1] [ main::i#2 main::i#1 ] : mem[1] , reg byte x , reg byte y , 
+Potential registers mem[2] [ plus::a#2 ] : mem[2] , 
+Potential registers mem[2] [ plus::b#2 plus::b#0 plus::b#1 ] : mem[2] , 
+Potential registers mem[2] [ plus::return#0 ] : mem[2] , 
+Potential registers mem[2] [ main::$1 ] : mem[2] , 
+Potential registers mem[1] [ main::$4 ] : mem[1] , reg byte a , reg byte x , reg byte y , 
+Potential registers mem[1] [ main::$2 ] : mem[1] , reg byte x , reg byte y , 
+Potential registers mem[2] [ plus::return#1 ] : mem[2] , 
+Potential registers mem[2] [ main::$3 ] : mem[2] , 
+Potential registers mem[1] [ main::$5 ] : mem[1] , reg byte a , reg byte x , reg byte y , 
+Potential registers mem[2] [ plus::r#1 ] : mem[2] , 
+Potential registers mem[2] [ plus::r#2 ] : mem[2] , 
+Potential registers mem[2] [ plus::r#3 ] : mem[2] , 
+Potential registers mem[2] [ plus::return#2 ] : mem[2] , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [plus] 202: mem[2] [ plus::r#1 ] 202: mem[2] [ plus::r#2 ] 202: mem[2] [ plus::r#3 ] 100: mem[2] [ plus::b#2 plus::b#0 plus::b#1 ] 67.33: mem[2] [ plus::a#2 ] 30.75: mem[2] [ plus::return#2 ] 22: mem[2] [ plus::return#0 ] 22: mem[2] [ plus::return#1 ] 
+Uplift Scope [main] 25.67: mem[1] [ main::i#2 main::i#1 ] 22: mem[1] [ main::$4 ] 22: mem[1] [ main::$5 ] 11: mem[2] [ main::$1 ] 11: mem[2] [ main::$3 ] 4.4: mem[1] [ main::$2 ] 
+Uplift Scope [] 
+
+Uplifting [plus] best 2226 combination mem[2] [ plus::r#1 ] mem[2] [ plus::r#2 ] mem[2] [ plus::r#3 ] mem[2] [ plus::b#2 plus::b#0 plus::b#1 ] mem[2] [ plus::a#2 ] mem[2] [ plus::return#2 ] mem[2] [ plus::return#0 ] mem[2] [ plus::return#1 ] 
+Uplifting [main] best 1866 combination reg byte y [ main::i#2 main::i#1 ] reg byte x [ main::$4 ] reg byte x [ main::$5 ] mem[2] [ main::$1 ] mem[2] [ main::$3 ] reg byte x [ main::$2 ] 
+Limited combination testing to 100 combinations of 144 possible.
+Uplifting [] best 1866 combination 
+Coalescing zero page register [ mem[2] [ plus::b#2 plus::b#0 plus::b#1 ] ] with [ mem[2] [ plus::return#2 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::return#0 ] ] with [ mem[2] [ main::$1 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::return#1 ] ] with [ mem[2] [ main::$3 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::r#1 ] ] with [ mem[2] [ plus::r#2 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::b#2 plus::b#0 plus::b#1 plus::return#2 ] ] with [ mem[2] [ plus::return#0 main::$1 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::b#2 plus::b#0 plus::b#1 plus::return#2 plus::return#0 main::$1 ] ] with [ mem[2] [ plus::return#1 main::$3 ] ] - score: 1
+Coalescing zero page register [ mem[2] [ plus::r#1 plus::r#2 ] ] with [ mem[2] [ plus::r#3 ] ] - score: 1
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+/**
+ * Test banked calls with memory variables.
+ * The parameters & return should end up in the shared/common bank.
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-memvars.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] phi from main to main::@1 [phi:main->main::@1]
+  __b1_from_main:
+    // [1] phi main::i#2 = 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
+    ldy #0
+    jmp __b1
+    // main::@1
+  __b1:
+    // [2] if(main::i#2<5) goto main::@2 -- vbuyy_lt_vbuc1_then_la1 
+    cpy #5
+    bcc __b2
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [3] return 
+    rts
+    // main::@2
+  __b2:
+    // [4] plus::b#0 = (int)main::i#2 -- vwsm1=_sword_vbuyy 
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    // [5] call plus
+    // [18] phi from main::@2 to plus [phi:main::@2->plus]
+  plus_from___b2:
+    // [18] phi plus::b#2 = plus::b#0 [phi:main::@2->plus#0] -- register_copy 
+    // [18] phi plus::a#2 = $64 [phi:main::@2->plus#1] -- call_phi_close_cx16_ram 
+    lda #<$64
+    sta plus.a
+    lda #>$64
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [6] plus::return#0 = plus::return#2
+    jmp __b3
+    // main::@3
+  __b3:
+    // [7] main::$1 = plus::return#0
+    // [8] main::$4 = main::i#2 << 1 -- vbuxx=vbuyy_rol_1 
+    tya
+    asl
+    tax
+    // [9] SCREEN[main::$4] = main::$1 -- pwsc1_derefidx_vbuxx=vwsm1 
+    lda __1
+    sta SCREEN,x
+    lda __1+1
+    sta SCREEN+1,x
+    // [10] main::$2 = $a + main::i#2 -- vbuxx=vbuc1_plus_vbuyy 
+    tya
+    tax
+    axs #-[$a]
+    // [11] plus::b#1 = (int)main::i#2 -- vwsm1=_sword_vbuyy 
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    // [12] call plus
+    // [18] phi from main::@3 to plus [phi:main::@3->plus]
+  plus_from___b3:
+    // [18] phi plus::b#2 = plus::b#1 [phi:main::@3->plus#0] -- register_copy 
+    // [18] phi plus::a#2 = $c8 [phi:main::@3->plus#1] -- call_phi_close_cx16_ram 
+    lda #<$c8
+    sta plus.a
+    lda #>$c8
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // [13] plus::return#1 = plus::return#2
+    jmp __b4
+    // main::@4
+  __b4:
+    // [14] main::$3 = plus::return#1
+    // [15] main::$5 = main::$2 << 1 -- vbuxx=vbuxx_rol_1 
+    txa
+    asl
+    tax
+    // [16] SCREEN[main::$5] = main::$3 -- pwsc1_derefidx_vbuxx=vwsm1 
+    lda __3
+    sta SCREEN,x
+    lda __3+1
+    sta SCREEN+1,x
+    // [17] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy 
+    iny
+    // [1] phi from main::@4 to main::@1 [phi:main::@4->main::@1]
+  __b1_from___b4:
+    // [1] phi main::i#2 = main::i#1 [phi:main::@4->main::@1#0] -- register_copy 
+    jmp __b1
+  .segment Data
+    .label __1 = plus.b
+    .label __3 = plus.b
+}
+.segment RAM_Bank1
+  // plus
+// __mem() int plus(__mem() int a, __mem() int b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // [19] plus::r#1 = 2 + plus::a#2 -- vwsm1=vwsc1_plus_vwsm2 
+    clc
+    lda a
+    adc #<2
+    sta r
+    lda a+1
+    adc #>2
+    sta r+1
+    // [20] plus::r#2 = plus::r#1 + plus::b#2 -- vwsm1=vwsm1_plus_vwsm2 
+    clc
+    lda r
+    adc b
+    sta r
+    lda r+1
+    adc b+1
+    sta r+1
+    // [21] plus::r#3 = plus::r#2 + plus::a#2 -- vwsm1=vwsm1_plus_vwsm2 
+    clc
+    lda r
+    adc a
+    sta r
+    lda r+1
+    adc a+1
+    sta r+1
+    // [22] plus::return#2 = plus::r#3 + plus::b#2 -- vwsm1=vwsm2_plus_vwsm1 
+    clc
+    lda return
+    adc r
+    sta return
+    lda return+1
+    adc r+1
+    sta return+1
+    jmp __breturn
+    // plus::@return
+  __breturn:
+    // [23] return 
+    rts
+  .segment Data
+    b: .word 0
+    .label return = b
+  .segment RAM_Bank1
+    r: .word 0
+  .segment Data
+    a: .word 0
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Removing instruction jmp __b3
+Removing instruction jmp __b4
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction __b1_from_main:
+Removing instruction __breturn:
+Removing instruction plus_from___b2:
+Removing instruction __b3:
+Removing instruction plus_from___b3:
+Removing instruction __b4:
+Removing instruction __b1_from___b4:
+Removing instruction __breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+__constant int * const SCREEN = (int *) 1024
+void main()
+int main::$1 // mem[2] 11.0
+char main::$2 // reg byte x 4.4
+int main::$3 // mem[2] 11.0
+char main::$4 // reg byte x 22.0
+char main::$5 // reg byte x 22.0
+char main::i
+char main::i#1 // reg byte y 22.0
+char main::i#2 // reg byte y 3.6666666666666665
+__bank(cx16_ram, 1) int plus(int a , int b)
+int plus::a
+int plus::a#2 // a mem[2] 67.33333333333333
+int plus::b
+int plus::b#0 // b mem[2] 22.0
+int plus::b#1 // b mem[2] 22.0
+int plus::b#2 // b mem[2] 56.0
+int plus::r
+int plus::r#1 // r mem[2] 202.0
+int plus::r#2 // r mem[2] 202.0
+int plus::r#3 // r mem[2] 202.0
+int plus::return
+int plus::return#0 // return mem[2] 22.0
+int plus::return#1 // return mem[2] 22.0
+int plus::return#2 // return mem[2] 30.75
+
+reg byte y [ main::i#2 main::i#1 ]
+mem[2] [ plus::a#2 ]
+mem[2] [ plus::b#2 plus::b#0 plus::b#1 plus::return#2 plus::return#0 main::$1 plus::return#1 main::$3 ]
+reg byte x [ main::$4 ]
+reg byte x [ main::$2 ]
+reg byte x [ main::$5 ]
+mem[2] [ plus::r#1 plus::r#2 plus::r#3 ]
+
+
+FINAL ASSEMBLER
+Score: 1103
+
+  // File Comments
+/**
+ * Test banked calls with memory variables.
+ * The parameters & return should end up in the shared/common bank.
+ */
+  // Upstart
+  .file                               [name="call-banked-phi-memvars.prg", type="prg", segments="Program"]
+.segmentdef Program                 [segments="Basic, Code, Data"]
+.segmentdef Basic                   [start=$0801]
+.segmentdef Code                    [start=$80d]
+.segmentdef Data                    [startAfter="Code"]
+.segmentdef RAM_Bank1               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef RAM_Bank2               [start=$A000, min=$A000, max=$BFFF, align=$100]
+.segmentdef ROM_Bank1               [start=$C000, min=$C000, max=$FFFF, align=$100]
+.segment Basic
+:BasicUpstart(main)
+.segment Code
+.segment Data
+
+
+  // Global Constants & labels
+  .label SCREEN = $400
+.segment Code
+  // main
+main: {
+    // [1] phi from main to main::@1 [phi:main->main::@1]
+    // [1] phi main::i#2 = 0 [phi:main->main::@1#0] -- vbuyy=vbuc1 
+    ldy #0
+    // main::@1
+  __b1:
+    // for(char i=0;i<5; i++)
+    // [2] if(main::i#2<5) goto main::@2 -- vbuyy_lt_vbuc1_then_la1 
+    cpy #5
+    bcc __b2
+    // main::@return
+    // }
+    // [3] return 
+    rts
+    // main::@2
+  __b2:
+    // plus(100, (int)i)
+    // [4] plus::b#0 = (int)main::i#2 -- vwsm1=_sword_vbuyy 
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    // [5] call plus
+    // [18] phi from main::@2 to plus [phi:main::@2->plus]
+    // [18] phi plus::b#2 = plus::b#0 [phi:main::@2->plus#0] -- register_copy 
+    // [18] phi plus::a#2 = $64 [phi:main::@2->plus#1] -- call_phi_close_cx16_ram 
+    lda #<$64
+    sta plus.a
+    lda #>$64
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus(100, (int)i)
+    // [6] plus::return#0 = plus::return#2
+    // main::@3
+    // [7] main::$1 = plus::return#0
+    // SCREEN[i] = plus(100, (int)i)
+    // [8] main::$4 = main::i#2 << 1 -- vbuxx=vbuyy_rol_1 
+    tya
+    asl
+    tax
+    // [9] SCREEN[main::$4] = main::$1 -- pwsc1_derefidx_vbuxx=vwsm1 
+    lda __1
+    sta SCREEN,x
+    lda __1+1
+    sta SCREEN+1,x
+    // 10+i
+    // [10] main::$2 = $a + main::i#2 -- vbuxx=vbuc1_plus_vbuyy 
+    tya
+    tax
+    axs #-[$a]
+    // plus(200, (int)i)
+    // [11] plus::b#1 = (int)main::i#2 -- vwsm1=_sword_vbuyy 
+    tya
+    sta plus.b
+    lda #0
+    sta plus.b+1
+    // [12] call plus
+    // [18] phi from main::@3 to plus [phi:main::@3->plus]
+    // [18] phi plus::b#2 = plus::b#1 [phi:main::@3->plus#0] -- register_copy 
+    // [18] phi plus::a#2 = $c8 [phi:main::@3->plus#1] -- call_phi_close_cx16_ram 
+    lda #<$c8
+    sta plus.a
+    lda #>$c8
+    sta plus.a+1
+    sta.z $ff
+    lda.z 0
+    pha
+    lda #1
+    sta.z 0
+    lda.z $ff
+    jsr plus
+    sta.z $ff
+    pla
+    sta.z 0
+    lda.z $ff
+    // plus(200, (int)i)
+    // [13] plus::return#1 = plus::return#2
+    // main::@4
+    // [14] main::$3 = plus::return#1
+    // SCREEN[10+i] = plus(200, (int)i)
+    // [15] main::$5 = main::$2 << 1 -- vbuxx=vbuxx_rol_1 
+    txa
+    asl
+    tax
+    // [16] SCREEN[main::$5] = main::$3 -- pwsc1_derefidx_vbuxx=vwsm1 
+    lda __3
+    sta SCREEN,x
+    lda __3+1
+    sta SCREEN+1,x
+    // for(char i=0;i<5; i++)
+    // [17] main::i#1 = ++ main::i#2 -- vbuyy=_inc_vbuyy 
+    iny
+    // [1] phi from main::@4 to main::@1 [phi:main::@4->main::@1]
+    // [1] phi main::i#2 = main::i#1 [phi:main::@4->main::@1#0] -- register_copy 
+    jmp __b1
+  .segment Data
+    .label __1 = plus.b
+    .label __3 = plus.b
+}
+.segment RAM_Bank1
+  // plus
+// __mem() int plus(__mem() int a, __mem() int b)
+// __bank(cx16_ram, 1) 
+plus: {
+    // r += a
+    // [19] plus::r#1 = 2 + plus::a#2 -- vwsm1=vwsc1_plus_vwsm2 
+    clc
+    lda a
+    adc #<2
+    sta r
+    lda a+1
+    adc #>2
+    sta r+1
+    // r += b
+    // [20] plus::r#2 = plus::r#1 + plus::b#2 -- vwsm1=vwsm1_plus_vwsm2 
+    clc
+    lda r
+    adc b
+    sta r
+    lda r+1
+    adc b+1
+    sta r+1
+    // r += a
+    // [21] plus::r#3 = plus::r#2 + plus::a#2 -- vwsm1=vwsm1_plus_vwsm2 
+    clc
+    lda r
+    adc a
+    sta r
+    lda r+1
+    adc a+1
+    sta r+1
+    // r += b
+    // [22] plus::return#2 = plus::r#3 + plus::b#2 -- vwsm1=vwsm2_plus_vwsm1 
+    clc
+    lda return
+    adc r
+    sta return
+    lda return+1
+    adc r+1
+    sta return+1
+    // plus::@return
+    // }
+    // [23] return 
+    rts
+  .segment Data
+    b: .word 0
+    .label return = b
+  .segment RAM_Bank1
+    r: .word 0
+  .segment Data
+    a: .word 0
+}
+  // File Data
+

src/test/ref/call-banked-phi-memvars.sym

@@ -0,0 +1,33 @@
+__constant int * const SCREEN = (int *) 1024
+void main()
+int main::$1 // mem[2] 11.0
+char main::$2 // reg byte x 4.4
+int main::$3 // mem[2] 11.0
+char main::$4 // reg byte x 22.0
+char main::$5 // reg byte x 22.0
+char main::i
+char main::i#1 // reg byte y 22.0
+char main::i#2 // reg byte y 3.6666666666666665
+__bank(cx16_ram, 1) int plus(int a , int b)
+int plus::a
+int plus::a#2 // a mem[2] 67.33333333333333
+int plus::b
+int plus::b#0 // b mem[2] 22.0
+int plus::b#1 // b mem[2] 22.0
+int plus::b#2 // b mem[2] 56.0
+int plus::r
+int plus::r#1 // r mem[2] 202.0
+int plus::r#2 // r mem[2] 202.0
+int plus::r#3 // r mem[2] 202.0
+int plus::return
+int plus::return#0 // return mem[2] 22.0
+int plus::return#1 // return mem[2] 22.0
+int plus::return#2 // return mem[2] 30.75
+
+reg byte y [ main::i#2 main::i#1 ]
+mem[2] [ plus::a#2 ]
+mem[2] [ plus::b#2 plus::b#0 plus::b#1 plus::return#2 plus::return#0 main::$1 plus::return#1 main::$3 ]
+reg byte x [ main::$4 ]
+reg byte x [ main::$2 ]
+reg byte x [ main::$5 ]
+mem[2] [ plus::r#1 plus::r#2 plus::r#3 ]

src/test/ref/inline-asm-ref-scoped.log

@@ -4,7 +4,7 @@ CONTROL FLOW GRAPH SSA
 void main()
 main: scope:[main]  from __start
   asm { lda#'c' stasub.ll+1  }
-  call sub 
+  call sub
   to:main::@1
 main::@1: scope:[main]  from main
   to:main::@return
@@ -22,7 +22,7 @@ sub::@return: scope:[sub]  from sub
 
 void __start()
 __start: scope:[__start]  from
-  call main 
+  call main
   to:__start::@1
 __start::@1: scope:[__start]  from __start
   to:__start::@return
@@ -53,7 +53,7 @@ FINAL CONTROL FLOW GRAPH
 void main()
 main: scope:[main]  from
   asm { lda#'c' stasub.ll+1  }
-  [1] call sub 
+  [1] call sub
   to:main::@return
 main::@return: scope:[main]  from main
   [2] return 
@@ -106,7 +106,7 @@ main: {
     // asm { lda#'c' stasub.ll+1  }
     lda #'c'
     sta sub.ll+1
-    // [1] call sub 
+    // [1] call sub
     jsr sub
     jmp __breturn
     // main::@return
@@ -165,7 +165,7 @@ main: {
     lda #'c'
     sta sub.ll+1
     // sub()
-    // [1] call sub 
+    // [1] call sub
     jsr sub
     // main::@return
     // }

src/test/ref/pragma-noparam-noparen.log

@@ -1,4 +1,3 @@
-Warning! Unknown #pragma nobank
 
 CONTROL FLOW GRAPH SSA