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optimize redundant rts/bra or rts/jmp generation in when statement

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This commit is contained in:
Irmen de Jong 2022-12-10 17:21:15 +01:00
parent d1d0115aed
commit 578969c34c
1 changed files with 27 additions and 2 deletions
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29
codeGenCpu6502/src/prog8/codegen/cpu6502/AsmOptimizer.kt
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@ -44,7 +44,7 @@ internal fun optimizeAssembly(lines: MutableList<String>, machine: IMachineDefin
numberOfOptimizations++
}
mods= optimizeJsrRts(linesByFour)
mods= optimizeJsrRtsAndOtherCombinations(linesByFour)
if(mods.isNotEmpty()) {
apply(mods, lines)
linesByFour = getLinesBy(lines, 4)
@ -486,8 +486,11 @@ private fun optimizeIncDec(linesByFour: List<List<IndexedValue<String>>>): List<
return mods
}
private fun optimizeJsrRts(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
private fun optimizeJsrRtsAndOtherCombinations(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
// jsr Sub + rts -> jmp Sub
// rts + jmp -> remove jmp
// rts + bxx -> remove bxx
val mods = mutableListOf<Modification>()
for (lines in linesByFour) {
val first = lines[0].value
@ -496,6 +499,28 @@ private fun optimizeJsrRts(linesByFour: List<List<IndexedValue<String>>>): List<
mods += Modification(lines[0].index, false, lines[0].value.replace("jsr", "jmp"))
mods += Modification(lines[1].index, true, null)
}
else if (" rts" in first || "\trts" in first) {
if (" jmp" in second || "\tjmp" in second)
mods += Modification(lines[1].index, true, null)
else if (" bra" in second || "\tbra" in second)
mods += Modification(lines[1].index, true, null)
else if (" bcc" in second || "\tbcc" in second)
mods += Modification(lines[1].index, true, null)
else if (" bcs" in second || "\tbcs" in second)
mods += Modification(lines[1].index, true, null)
else if (" beq" in second || "\tbeq" in second)
mods += Modification(lines[1].index, true, null)
else if (" bne" in second || "\tbne" in second)
mods += Modification(lines[1].index, true, null)
else if (" bmi" in second || "\tbmi" in second)
mods += Modification(lines[1].index, true, null)
else if (" bpl" in second || "\tbpl" in second)
mods += Modification(lines[1].index, true, null)
else if (" bvs" in second || "\tbvs" in second)
mods += Modification(lines[1].index, true, null)
else if (" bvc" in second || "\tbvc" in second)
mods += Modification(lines[1].index, true, null)
}
}
return mods
}