mirror of
https://github.com/cc65/cc65.git
synced 2024-11-07 21:10:15 +00:00
36 lines
880 B
ArmAsm
36 lines
880 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 17.08.1998
|
|
;
|
|
; CC65 runtime: division for signed long ints
|
|
;
|
|
|
|
; When negating values, we will ignore the possibility here, that one of the
|
|
; values if $80000000, in which case the negate will fail.
|
|
|
|
.export tosdiveax
|
|
.import poplsargs, udiv32, negeax
|
|
.importzp ptr1, tmp1, tmp2
|
|
|
|
tosdiveax:
|
|
jsr poplsargs ; Get arguments from stack, adjust sign
|
|
jsr udiv32 ; Do the division, result is in (ptr1:sreg)
|
|
ldx ptr1+1 ; Load byte 1 of result
|
|
|
|
; Adjust the sign of the result
|
|
|
|
lda tmp1 ; Get sign of left operand
|
|
eor tmp2 ; Calculate sign of result
|
|
bpl Pos ; Jump if result positive
|
|
|
|
; Result is negative
|
|
|
|
lda ptr1 ; Load byte 0
|
|
jmp negeax ; Negate value
|
|
|
|
; Result is positive
|
|
|
|
Pos: lda ptr1
|
|
rts
|
|
|
|
|