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cc65/libsrc/runtime/addeqsp.s

25 lines
380 B
ArmAsm

;
; Ullrich von Bassewitz, 08.10.1998
;
; CC65 runtime: += operator for ints on the stack
;
.export addeq0sp, addeqysp
.importzp sp
addeq0sp:
ldy #0
addeqysp:
clc
adc (sp),y
sta (sp),y
pha
iny
txa
adc (sp),y
sta (sp),y
tax
pla
rts