umodsi3.S revision 1.4 
1/* Unsigned 32 bit modulo optimized for Epiphany.
2   Copyright (C) 2009-2016 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 (__umodsi3,T_UINT)
29	.global SYM(__umodsi3)
30	.balign 4
31	HIDDEN_FUNC(__umodsi3)
32SYM(__umodsi3):
33	mov r2,5
34	lsl r2,r2,29 ; 0xa0000000
35	orr r3,r2,r0
36	lsr r15,r0,16
37	movt r15,0xa800
38	movne r3,r15
39	lsr r16,r2,2 ; 0x28000000
40	and r15,r3,r16
41	fadd r12,r3,r15
42	 orr r3,r2,r1
43	lsr r2,r1,16
44	movt r2,0xa800
45	movne r3,r2
46	and r2,r16,r3
47	fadd r3,r3,r2
48	 sub r2,r0,r1
49	bltu .Lret_a
50	lsr r12,r12,23
51	mov r2,%low(.L0step)
52	movt r2,%high(.L0step)
53	lsr r3,r3,23
54	sub r3,r12,r3 ; calculate bit number difference.
55	lsl r3,r3,3
56	sub r2,r2,r3
57	jr r2
58/*              lsl_l r2,r1,n`               sub r2,r0,r2` movgteu r0,r2  */
59#define STEP(n) .long 0x0006441f | (n) << 5` sub r2,r0,r2` movgteu r0,r2
60	.balign 8,,2
61	STEP(31)` STEP(30)` STEP(29)` STEP(28)`
62	STEP(27)` STEP(26)` STEP(25)` STEP(24)`
63	STEP(23)` STEP(22)` STEP(21)` STEP(20)`
64	STEP(19)` STEP(18)` STEP(17)` STEP(16)`
65	STEP(15)` STEP(14)` STEP(13)` STEP(12)`
66	STEP(11)` STEP(10)` STEP(9)`  STEP(8)`
67	STEP(7)` STEP(6)` STEP(5)` STEP(4)` STEP(3)` STEP(2)` STEP(1)
68.L0step:STEP(0)
69.Lret_a:rts
70	ENDFUNC(__umodsi3)
71