.segment "LIBCODE"
;
; Ullrich von Bassewitz, 07.08.1998
;
; CC65 runtime: division for 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		tosdiva0, tosdivax
	.import		popsargs, udiv16, negax
	.importzp	sreg, tmp1, tmp2

tosdiva0:
      	ldx	#0
tosdivax:
	jsr	popsargs	; Get arguments from stack, adjust sign
      	jsr	udiv16		; Do the division
        ldx     sreg+1          ; Load high byte of result

; Adjust the sign of the result. tmp1 contains the high byte of the left
; operand, tmp2 contains the high byte of the right operand.

        lda     tmp1
        eor     tmp2
        bpl     Pos             ; Jump if sign of result positive

; Result is negative

        lda     sreg            ; Load low byte of result
        jmp     negax           ; Adjust the sign

; Result is positive

Pos:    lda     sreg
        rts

