1/* Unsigned 32 bit division optimized for Epiphany.
2   Copyright (C) 2009-2022 Free Software Foundation, Inc.
3   Contributed by Embecosm on behalf of Adapteva, Inc.
4
5This file is part of GCC.
6
7This file is free software; you can redistribute it and/or modify it
8under the terms of the GNU General Public License as published by the
9Free Software Foundation; either version 3, or (at your option) any
10later version.
11
12This file is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15General Public License for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24<http://www.gnu.org/licenses/>.  */
25
26#include "epiphany-asm.h"
27
28	FSTAB (__modsi3,T_UINT)
29	.global SYM(__modsi3)
30	.balign 4
31	HIDDEN_FUNC(__modsi3)
32SYM(__modsi3):
33	asr TMP3,r0,31 ; save sign
34	 float TMP0,r0
35	float TMP1,r1
36	 mov r2,0
37	sub TMP4,r2,r0
38	beq .Lret_r0
39	movgt r0,TMP4
40	sub TMP2,r2,r1
41	movlte TMP2,r1
42	sub r2,TMP0,TMP1
43	lsl r2,r2,1
44	blte .L0step
45	asr TMP4,r2,24
46	lsl r2,TMP4,3
47	mov TMP4,%low(.L0step)
48	movt TMP4,%high(.L0step)
49	sub r2,TMP4,r2
50	jr r2
51#define STEP(n) lsl.l r2,TMP2,n` sub r2,r0,r2` movgteu r0,r2
52	.balign 8,,2
53	STEP(31)` STEP(30)` STEP(29)` STEP(28)`
54	STEP(27)` STEP(26)` STEP(25)` STEP(24)`
55	STEP(23)` STEP(22)` STEP(21)` STEP(20)`
56	STEP(19)` STEP(18)` STEP(17)` STEP(16)`
57	STEP(15)` STEP(14)` STEP(13)` STEP(12)`
58	STEP(11)` STEP(10)` STEP(9)`  STEP(8)`
59	STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
60.L0step:STEP(0)
61	eor r0,r0,TMP3 ; restore sign
62	sub r0,r0,TMP3
63.Lret_r0:
64	rts
65	ENDFUNC(__modsi3)
66