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cc65/libsrc/runtime/popsreg.s
uz 3c168b4323 A few minor 65C02 optimizations.
git-svn-id: svn://svn.cc65.org/cc65/trunk@3944 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-02-22 15:39:19 +00:00

28 lines
496 B
ArmAsm

;
; 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