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cc65/libsrc/runtime/swap.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; CC65 runtime: swap ax with TOS
;
.export swapstk
.importzp sp, ptr4
swapstk:
sta ptr4
stx ptr4+1
ldy #1 ; index
lda (sp),y
tax
lda ptr4+1
sta (sp),y
dey
lda (sp),y
pha
lda ptr4
sta (sp),y
pla
rts ; whew!