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cc65/libsrc/runtime/dec.s
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ArmAsm

;
; Ullrich von Bassewitz, 29.12.1999
;
; CC65 runtime: Decrement ax by constant or value in Y
;
.export decaxy
.export decax2, decax1
.importzp tmp1
decaxy: sty tmp1
sec
sbc tmp1
bcs *+3
dex
rts
decax2: sec
sbc #2
bcs *+3
dex
rts
decax1: sec
sbc #1
bcs *+3
dex
rts