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cc65/libsrc/runtime/ldec.s

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;
; Ullrich von Bassewitz, 29.12.1999
;
; CC65 runtime: Decrement eax by value in Y
;
.export deceaxy
.importzp sreg, tmp1
deceaxy:
sty tmp1
sec
sbc tmp1
sta tmp1
txa
sbc #0
tax
lda sreg
sbc #0
sta sreg
lda sreg+1
sbc #0
sta sreg+1
lda tmp1
rts