mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 00:29:31 +00:00
40 lines
755 B
ArmAsm
40 lines
755 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 2009-11-04
|
|
;
|
|
; CC65 library: 32by16 => 16 signed division
|
|
;
|
|
|
|
.export _cc65_idiv32by16r16
|
|
.import idiv32by16r16, incsp4
|
|
|
|
.include "zeropage.inc"
|
|
|
|
|
|
;---------------------------------------------------------------------------
|
|
; 32by16 division.
|
|
|
|
.proc _cc65_idiv32by16r16
|
|
|
|
pha ; Save rhs
|
|
|
|
; Copy from stack to zeropage. This assumes ptr1 and ptr2 are adjacent.
|
|
|
|
ldy #3
|
|
@L1: lda (sp),y
|
|
sta ptr1,y
|
|
dey
|
|
bpl @L1
|
|
|
|
lda #4
|
|
clc
|
|
adc sp
|
|
sta sp
|
|
bcc @L2
|
|
inc sp+1
|
|
|
|
@L2: pla ; Old rhs
|
|
jmp idiv32by16r16
|
|
|
|
.endproc
|
|
|