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cc65/libsrc/runtime/lpush.s

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;
; Ullrich von Bassewitz, 06.08.1998
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; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
;
; CC65 runtime: long push
;
;
; push eax on stack
;
.export pushl0, push0ax, pusheax
.import decsp4
.importzp sp, sreg
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.macpack cpu
pushl0:
lda #0
tax
push0ax:
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.if (.cpu .bitand ::CPU_ISET_65SC02)
stz sreg
stz sreg+1
.else
ldy #$00
sty sreg
sty sreg+1
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.endif
pusheax:
pha ; decsp will destroy A (but not X)
jsr decsp4
ldy #3
lda sreg+1
sta (sp),y
dey
lda sreg
sta (sp),y
dey
txa
sta (sp),y
pla
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.if (.cpu .bitand ::CPU_ISET_65SC02)
sta (sp)
.else
dey
sta (sp),y
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.endif
rts