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cc65/libsrc/runtime/decsp2.s

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;
; Ullrich von Bassewitz, 25.10.2000
;
; CC65 runtime: Decrement the stackpointer by 2
;
.export decsp2
.importzp sp
.proc decsp2
ldy sp
beq @L1
dey
beq @L2
dey
sty sp
rts
@L1: dey
@L2: dey
sty sp
dec sp+1
rts
.endproc