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cc65/libsrc/runtime/ldasp.s

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;
; Ullrich von Bassewitz, 31.08.1998
;
; CC65 runtime: Load a from offset in stack
;
.export ldasp, ldaysp
.importzp sp
ldasp: ldy #0
ldaysp: ldx #0
lda (sp),y
bpl L9 ; Jump if positive
dex
L9: rts