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cc65/libsrc/runtime/pushb.s

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;
; Ullrich von Bassewitz, 31.08.1998
;
; CC65 runtime: Push word from stack
;
.export pushb, pushbidx
.import pushax
.importzp ptr1
pushbidx:
sty ptr1
clc
adc ptr1
bcc pushb
inx
pushb: sta ptr1
stx ptr1+1
ldx #0 ; Load index/high byte
lda (ptr1,x)
bpl L1
dex ; Make high byte FF
L1: jmp pushax