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cc65/libsrc/runtime/staxsp.s

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;
; Ullrich von Bassewitz, 31.08.1998
;
; CC65 runtime: Store ax at (sp),y
;
.export staxysp, stax0sp
.importzp sp
stax0sp:
ldy #0
staxysp:
sta (sp),y
iny
pha
txa
sta (sp),y
pla
rts