2 ; Ullrich von Bassewitz, 17.08.1998
4 ; CC65 runtime: division for signed long ints
7 ; When negating values, we will ignore the possibility here, that one of the
8 ; values if $80000000, in which case the negate will fail.
10 .export tosdiv0ax, tosdiveax
11 .import poplsargs, udiv32, negeax
12 .importzp sreg, ptr1, tmp1, tmp2
20 jsr poplsargs ; Get arguments from stack, adjust sign
21 jsr udiv32 ; Do the division, result is in (ptr1:sreg)
22 ldx ptr1+1 ; Load byte 1 of result
24 ; Adjust the sign of the result
26 lda tmp1 ; Get sign of left operand
27 eor tmp2 ; Calculate sign of result
28 bpl Pos ; Jump if result positive
32 lda ptr1 ; Load byte 0
33 jmp negeax ; Negate value