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cc65/libsrc/runtime/laddeqsp.s
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ArmAsm

;
; Ullrich von Bassewitz, 08.10.1998
;
; CC65 runtime: += operator for longs on the stack
;
.export laddeq0sp, laddeqysp
.importzp sp, sreg
laddeq0sp:
ldy #0
laddeqysp:
clc
adc (sp),y
sta (sp),y
pha
iny
txa
adc (sp),y
sta (sp),y
tax
iny
lda sreg
adc (sp),y
sta (sp),y
sta sreg
iny
lda sreg+1
adc (sp),y
sta (sp),y
sta sreg+1
pla
rts