mirror of
https://github.com/cc65/cc65.git
synced 2024-11-03 10:07:02 +00:00
31 lines
665 B
ArmAsm
31 lines
665 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 07.08.1998
|
|
;
|
|
; CC65 runtime: helper stuff for mod/div/mul with signed ints
|
|
;
|
|
|
|
; When negating values, we will ignore the possibility here, that one of the
|
|
; values if $8000, in which case the negate will fail.
|
|
|
|
.export popsargs
|
|
.import negax, popax
|
|
.importzp sreg, tmp1, tmp2, ptr4
|
|
|
|
popsargs:
|
|
stx tmp2 ; Remember sign
|
|
cpx #0
|
|
bpl L1
|
|
jsr negax ; Negate accumulator
|
|
L1: sta ptr4
|
|
stx ptr4+1 ; Save right operand
|
|
|
|
jsr popax
|
|
stx tmp1 ; Remember sign
|
|
cpx #0
|
|
bpl L2
|
|
jsr negax
|
|
L2: sta sreg
|
|
stx sreg+1
|
|
rts
|
|
|