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cc65/libsrc/runtime/lumod.s
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ArmAsm

;
; Ullrich von Bassewitz, 27.09.1998
;
; CC65 runtime: modulo operation for long unsigned ints
;
.export tosumodeax
.import getlop, udiv32
.importzp sreg, tmp3, tmp4, ptr2
tosumodeax:
jsr getlop ; Get the paramameters
jsr udiv32 ; Do the division
lda tmp3 ; Remainder is in ptr2:tmp3:tmp4
sta sreg
lda tmp4
sta sreg
lda ptr2
ldx ptr2+1
rts