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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

3
codeOptimizers/src/prog8/optimizer/ExpressionSimplifier.kt
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@@ -434,7 +434,7 @@ class ExpressionSimplifier(private val program: Program, private val errors: IEr
fun isFactorOf256(number: Double): Boolean {
val intValue = number.toInt()
return intValue > 0 && (intValue and (intValue shl 8)) == 0
return intValue >= 256 && (intValue and 0xFF) == 0
}
if (leftDt.isUnsignedWord && rightVal!=null) {
@@ -465,7 +465,6 @@ class ExpressionSimplifier(private val program: Program, private val errors: IEr
else if(expr.operator == "<" && rightVal.number == 256.0 || expr.operator == "<=" && rightVal.number == 255.0) {
// uword < 256 --> msb(value)==0
// uword <= 255 --> msb(value)==0
// OK!
expr.operator = "=="
expr.left = FunctionCallExpression(IdentifierReference(listOf("msb"), expr.left.position), mutableListOf(expr.left), expr.left.position)
expr.right = NumericLiteral(BaseDataType.UBYTE, 0.0, expr.right.position)

9
docs/source/todo.rst
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@@ -1,15 +1,6 @@
TODO
====
REGRESSIONS:
halloween , musicdemo is broken (wrong fade colors, hangs)
benchmark program: circles with gfx_lores is broken (black screen, returns immediately)
megascroll is 20 bytes larger
chess is a dozen bytes larger
petaxian is much larger
imageviewer/shell view: team17.iff blackscreen
STRUCTS and TYPED POINTERS
--------------------------