File: shelp.s

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cc65 2.19-2
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;
; Ullrich von Bassewitz, 07.08.1998
;
; CC65 runtime: helper stuff for mod/div with signed ints
;

; When negating values, we will ignore the possibility here, that one of the
; values is $8000, in which case the negate will fail.

        .export         popsargsudiv16
        .import         negax, popax, udiv16
        .importzp       tmp1, tmp2, ptr1, ptr4

popsargsudiv16:
        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     ptr1
        stx     ptr1+1
        jmp     udiv16            ; Call the division