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This commit is contained in:
Piotr Fusik
2018-03-08 22:10:11 +01:00
parent a32c50a6bc
commit 970c5f6184
1 changed files with 3 additions and 0 deletions
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3
libsrc/runtime/ldec.s
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@@ -13,12 +13,15 @@ deceaxy:
sec sec
sbc tmp1 sbc tmp1
bcs @L9 bcs @L9
; borrow from X
dex dex
cpx #$ff cpx #$ff
bne @L9 bne @L9
; X wrapped from zero to $ff, borrow from sreg
dec sreg dec sreg
cpx sreg cpx sreg
bne @L9 bne @L9
; sreg wrapped from zero to $ff, borrow from sreg+1
dec sreg+1 dec sreg+1
@L9: rts @L9: rts