1
0
mirror of https://github.com/cc65/cc65.git synced 2024-11-18 00:07:21 +00:00
cc65/libsrc/common/cc65_idiv32by16r16.s
uz 18272c0427 Working on the division and multiplication routines.
git-svn-id: svn://svn.cc65.org/cc65/trunk@4443 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-11-04 19:41:54 +00:00

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