Apple-2-SW/prog8
1
0
Fork 0
mirror of https://github.com/irmen/prog8.git synced 2025-03-22 19:30:04 +00:00
Code Issues Projects Releases Wiki Activity

tiny optimization of negating a register

Browse Source
This commit is contained in:
Irmen de Jong 2021-11-20 21:42:55 +01:00
parent adfaddbcf4
commit 7936fc5bd8
1 changed files with 3 additions and 3 deletions

6
codeGeneration/src/prog8/compiler/target/cpu6502/codegen/assignment/AugmentableAssignmentAsmGen.kt

@ -2000,9 +2000,9 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
}
TargetStorageKind.REGISTER -> {
when(target.register!!) {
RegisterOrPair.A -> asmgen.out(" sta P8ZP_SCRATCH_B1 | lda #0 | sec | sbc P8ZP_SCRATCH_B1")
RegisterOrPair.X -> asmgen.out(" stx P8ZP_SCRATCH_B1 | lda #0 | sec | sbc P8ZP_SCRATCH_B1 | tax")
RegisterOrPair.Y -> asmgen.out(" sty P8ZP_SCRATCH_B1 | lda #0 | sec | sbc P8ZP_SCRATCH_B1 | tay")
RegisterOrPair.A -> asmgen.out(" eor #255 | clc | adc #1")
RegisterOrPair.X -> asmgen.out(" txa | eor #255 | tax | inx")
RegisterOrPair.Y -> asmgen.out(" tya | eor #255 | tay | iny")
else -> throw AssemblyError("invalid reg dt for byte negate")
}
}