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more opportunities to use LDA(zp) instead of LDA(zp),Y on 65c02

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This commit is contained in:
Irmen de Jong 2023-10-31 21:26:55 +01:00
parent 2ceaa25181
commit b3803cbdf1
1 changed files with 24 additions and 9 deletions
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33
codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
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@ -68,12 +68,21 @@ internal class AssignmentAsmGen(private val program: PtProgram,
throw AssemblyError("non-array var indexing requires bytes dt")
if(value.type != DataType.UBYTE)
throw AssemblyError("non-array var indexing requires bytes index")
asmgen.loadScaledArrayIndexIntoRegister(value, elementDt, CpuRegister.Y)
if(asmgen.isZpVar(value.variable)) {
asmgen.out(" lda ($arrayVarName),y")
if(asmgen.isTargetCpu(CpuType.CPU65c02) && (value.index as? PtNumber)?.number==0.0) {
if (asmgen.isZpVar(value.variable)) {
asmgen.out(" lda ($arrayVarName)")
} else {
asmgen.out(" lda $arrayVarName | sta P8ZP_SCRATCH_W1 | lda $arrayVarName+1 | sta P8ZP_SCRATCH_W1+1")
asmgen.out(" lda (P8ZP_SCRATCH_W1)")
}
} else {
asmgen.out(" lda $arrayVarName | sta P8ZP_SCRATCH_W1 | lda $arrayVarName+1 | sta P8ZP_SCRATCH_W1+1")
asmgen.out(" lda (P8ZP_SCRATCH_W1),y")
asmgen.loadScaledArrayIndexIntoRegister(value, elementDt, CpuRegister.Y)
if (asmgen.isZpVar(value.variable)) {
asmgen.out(" lda ($arrayVarName),y")
} else {
asmgen.out(" lda $arrayVarName | sta P8ZP_SCRATCH_W1 | lda $arrayVarName+1 | sta P8ZP_SCRATCH_W1+1")
asmgen.out(" lda (P8ZP_SCRATCH_W1),y")
}
}
assignRegisterByte(assign.target, CpuRegister.A, elementDt in SignedDatatypes)
return
@ -3778,10 +3787,16 @@ internal class AssignmentAsmGen(private val program: PtProgram,
}
else -> {
asmgen.assignExpressionToVariable(memory.address, "P8ZP_SCRATCH_W2", DataType.UWORD)
asmgen.out("""
ldy #0
lda (P8ZP_SCRATCH_W2),y
eor #255""")
if(asmgen.isTargetCpu(CpuType.CPU65c02)) {
asmgen.out("""
lda (P8ZP_SCRATCH_W2)
eor #255""")
} else {
asmgen.out("""
ldy #0
lda (P8ZP_SCRATCH_W2),y
eor #255""")
}
asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2")
}
}