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cc65/libsrc/runtime/popsreg.s

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;
; Ullrich von Bassewitz, 1998-08-21, 2009-02-22
;
; CC65 runtime: Pop TOS into sreg
;
.export popsreg
.import incsp2
.importzp sp, sreg
.macpack cpu
popsreg:
pha ; save A
ldy #1
lda (sp),y ; get hi byte
sta sreg+1 ; store it
.if (.cpu .bitand ::CPU_ISET_65SC02)
lda (sp) ; get lo byte
.else
dey
lda (sp),y ; get lo byte
.endif
sta sreg ; store it
pla ; get A back
jmp incsp2 ; bump stack and return