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fix long bitwise expressions temp register usage

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Irmen de Jong
2025-10-14 02:57:48 +02:00
parent ee5d33a230
commit a36501a9ed
3 changed files with 14 additions and 21 deletions
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19
codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
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@@ -2034,25 +2034,24 @@ internal class AssignmentAsmGen(
} }
} }
// TODO use R14:R15 instead
val targetreg = target.register val targetreg = target.register
if(targetreg!=RegisterOrPair.R12R13_32) { if(targetreg!=RegisterOrPair.R14R15_32) {
asmgen.pushLongRegisters(RegisterOrPair.R12R13_32, 1) asmgen.pushLongRegisters(RegisterOrPair.R14R15_32, 1)
} }
asmgen.assignExpressionToRegister(expr.left, RegisterOrPair.R12R13_32, expr.left.type.isSigned) asmgen.assignExpressionToRegister(expr.left, RegisterOrPair.R14R15_32, expr.left.type.isSigned)
val constval = expr.right.asConstInteger() val constval = expr.right.asConstInteger()
val varname = (expr.right as? PtIdentifier)?.name val varname = (expr.right as? PtIdentifier)?.name
if(constval!=null) if(constval!=null)
augmentableAsmGen.inplacemodificationLongWithLiteralval("cx16.r12", expr.operator, constval) augmentableAsmGen.inplacemodificationLongWithLiteralval("cx16.r14", expr.operator, constval)
else if(varname!=null) else if(varname!=null)
augmentableAsmGen.inplacemodificationLongWithVariable("cx16.r12", expr.operator, varname) augmentableAsmGen.inplacemodificationLongWithVariable("cx16.r14", expr.operator, varname)
else { else {
// TODO: preserve R14:R15 on stack here? (the function does't do it for us) // TODO: preserve R14:R15 on stack here? (the function does't do it for us)
augmentableAsmGen.inplacemodificationLongWithExpression("cx16.r12", expr.operator, expr.right) augmentableAsmGen.inplacemodificationLongWithExpression("cx16.r14", expr.operator, expr.right)
} }
assignRegisterLong(target, RegisterOrPair.R12R13_32) assignRegisterLong(target, RegisterOrPair.R14R15_32)
if(targetreg!=RegisterOrPair.R12R13_32) { if(targetreg!=RegisterOrPair.R14R15_32) {
asmgen.popLongRegisters(RegisterOrPair.R12R13_32, 1) asmgen.popLongRegisters(RegisterOrPair.R14R15_32, 1)
} }
return true return true
} }

1
docs/source/todo.rst
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@@ -1,7 +1,6 @@
TODO TODO
==== ====
- optimizedBitwiseExpr(): use R14:R15 instead to save copying/stack manipulation?
- implement inplaceLongAdd/Sub in PointerAssignmentGen - implement inplaceLongAdd/Sub in PointerAssignmentGen

15
examples/test.p8
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@@ -7,17 +7,12 @@ main {
sub start() { sub start() {
long @shared lv, lv2 long @shared lv, lv2
cx16.r0L = if lv==9999 then 99 else 42 lv = $11111111
txt.print_ub(cx16.r0L) lv2 = $55555555
txt.nl()
lv2 = if lv==9999 then 999999 else 424242 lv = lv | lv2 ^ 999999
txt.print_l(lv2)
txt.nl() txt.print_ulhex(lv, true) ; $555b177b
lv=9999
lv2 = if lv==9999 then 999999 else 424242
txt.print_l(lv2)
txt.nl()
; long @shared lv1 = $12345678 ; long @shared lv1 = $12345678