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cc65/libsrc/runtime/subeqsp.s
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ArmAsm

;
; Ullrich von Bassewitz, 08.10.1998
;
; CC65 runtime: -= operator for ints on the stack
;
.export subeq0sp, subeqysp
.importzp sp, tmp1, tmp2
subeq0sp:
ldy #0
subeqysp:
sec
sta tmp1
stx tmp2
lda (sp),y
sbc tmp1
sta (sp),y
pha
iny
lda (sp),y
sbc tmp2
sta (sp),y
tax
pla
rts