summaryrefslogtreecommitdiffstats
path: root/arch/sh/lib/udivsi3.S
blob: 09ed1f9deb2ea79e49d7bdae84bfcda2265ffa23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
/* SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0

   Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2004, 2005
   Free Software Foundation, Inc.
*/

!! libgcc routines for the Renesas / SuperH SH CPUs.
!! Contributed by Steve Chamberlain.
!! sac@cygnus.com

	.balign 4
	.global	__udivsi3
	.type	__udivsi3, @function
div8:
	div1 r5,r4
div7:
	div1 r5,r4; div1 r5,r4; div1 r5,r4
	div1 r5,r4; div1 r5,r4; div1 r5,r4; rts; div1 r5,r4

divx4:
	div1 r5,r4; rotcl r0
	div1 r5,r4; rotcl r0
	div1 r5,r4; rotcl r0
	rts; div1 r5,r4

__udivsi3:
	sts.l pr,@-r15
	extu.w r5,r0
	cmp/eq r5,r0
	bf/s large_divisor
	div0u
	swap.w r4,r0
	shlr16 r4
	bsr div8
	shll16 r5
	bsr div7
	div1 r5,r4
	xtrct r4,r0
	xtrct r0,r4
	bsr div8
	swap.w r4,r4
	bsr div7
	div1 r5,r4
	lds.l @r15+,pr
	xtrct r4,r0
	swap.w r0,r0
	rotcl r0
	rts
	shlr16 r5

large_divisor:
	mov #0,r0
	xtrct r4,r0
	xtrct r0,r4
	bsr divx4
	rotcl r0
	bsr divx4
	rotcl r0
	bsr divx4
	rotcl r0
	bsr divx4
	rotcl r0
	lds.l @r15+,pr
	rts
	rotcl r0