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fix broken uword comparison and asm peephole optimization

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This commit is contained in:
Irmen de Jong
2025-09-23 23:17:25 +02:00
parent f3b060df51
commit 4fe8b72d42
3 changed files with 8 additions and 14 deletions
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10
codeGenCpu6502/src/prog8/codegen/cpu6502/AsmOptimizer.kt
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@@ -463,15 +463,19 @@ private fun optimizeStoreLoadSame(
mods.add(Modification(lines[2].index, true, null))
}
// all 3 registers: lda VALUE + sta SOMEWHERE + lda VALUE -> last load can be eliminated
// all 3 registers: lda VALUE + sta SOMEWHERE + lda VALUE -> last load can be eliminated IF NOT IO ADDRESS
if (first.startsWith("lda ") && second.startsWith("sta ") && third.startsWith("lda ") ||
first.startsWith("ldx ") && second.startsWith("stx ") && third.startsWith("ldx ") ||
first.startsWith("ldy ") && second.startsWith("sty ") && third.startsWith("ldy ")
) {
val firstVal = first.substring(4).trimStart()
val thirdVal = third.substring(4).trimStart()
if (firstVal == thirdVal)
mods.add(Modification(lines[3].index, true, null))
if (firstVal == thirdVal) {
val address = getAddressArg(third, symbolTable)
if (address != null && !machine.isIOAddress(address)) {
mods.add(Modification(lines[3].index, true, null))
}
}
}
}
return mods