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replace jmp to rts with rts in double jump elimination pass

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This commit is contained in:
Travis Fisher 2019-04-01 18:14:18 -04:00
parent 0fa2ec584e
commit 7784f174b7
1 changed files with 14 additions and 5 deletions
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19
src/main/java/dk/camelot64/kickc/passes/Pass5DoubleJumpElimination.java
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@ -40,9 +40,13 @@ public class Pass5DoubleJumpElimination extends Pass5AsmOptimization {
if(currentLabel != null) {
AsmInstruction asmInstruction = (AsmInstruction) line;
AsmInstructionType jmpType = AsmInstructionSet.getInstructionType("jmp", AsmAddressingMode.ABS, false);
AsmInstructionType rtsType = AsmInstructionSet.getInstructionType("rts", AsmAddressingMode.NON, false);
if(asmInstruction.getType().equals(jmpType)) {
immediateJumps.put(currentScope + "::" + currentLabel, asmInstruction.getParameter());
}
if(asmInstruction.getType().equals(rtsType)) {
immediateJumps.put(currentScope + "::" + currentLabel, "rts");
}
}
currentLabel = null;
} else {
@ -59,13 +63,18 @@ public class Pass5DoubleJumpElimination extends Pass5AsmOptimization {
} else if(line instanceof AsmScopeEnd) {
currentScope = "";
} else if(line instanceof AsmInstruction) {
AsmInstruction asmInstruction = (AsmInstruction) line;
AsmInstruction asmInstruction = (AsmInstruction) line;
if(asmInstruction.getType().isJump()) {
String immediateJmpTarget = immediateJumps.get(currentScope + "::" + asmInstruction.getParameter());
if(immediateJmpTarget != null && !immediateJmpTarget.equals(asmInstruction.getParameter())) {
getLog().append("Skipping double jump to " + immediateJmpTarget + " in " + asmInstruction.toString());
asmInstruction.setParameter(immediateJmpTarget);
optimized = true;
if (immediateJmpTarget == "rts" && asmInstruction.getType().getMnemnonic()=="jmp") {
getLog().append("Replacing jump to rts with rts in " + asmInstruction.toString());
AsmInstructionType rtsType = AsmInstructionSet.getInstructionType("rts", AsmAddressingMode.NON, false);
asmInstruction.setType(rtsType);
optimized = true;
} else if(immediateJmpTarget != null && immediateJmpTarget != "rts" && !immediateJmpTarget.equals(asmInstruction.getParameter())) {
getLog().append("Skipping double jump to " + immediateJmpTarget + " in " + asmInstruction.toString());
asmInstruction.setParameter(immediateJmpTarget);
optimized = true;
}
}
}