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
67
68
69
70
71
72
73
74
|
/* mpn_submul_1 -- multiply and subtract bignums.
Copyright (C) 2013-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
.syntax unified
.text
@ cycles/limb
@ StrongArm ?
@ Cortex-A8 ?
@ Cortex-A9 ?
@ Cortex-A15 4
/* mp_limb_t mpn_submul_1(res_ptr, src1_ptr, size, s2_limb) */
ENTRY (__mpn_submul_1)
push { r4, r5, r6, r7 }
cfi_adjust_cfa_offset (16)
cfi_rel_offset (r4, 0)
cfi_rel_offset (r5, 4)
cfi_rel_offset (r6, 8)
cfi_rel_offset (r7, 12)
sfi_breg r1, \
ldr r6, [\B], #4
sfi_breg r0, \
ldr r7, [\B]
mov r4, #0 /* init carry in */
b 1f
0:
sfi_breg r1, \
ldr r6, [\B], #4 /* load next ul */
adds r5, r5, r4 /* (lpl, c) = lpl + cl */
adc r4, ip, #0 /* cl = hpl + c */
subs r5, r7, r5 /* (lpl, !c) = rl - lpl */
sfi_breg r0, \
ldr r7, [\B, #4] /* load next rl */
it cc
addcc r4, r4, #1 /* cl += !c */
sfi_breg r0, \
str r5, [\B], #4
1:
umull r5, ip, r6, r3 /* (hpl, lpl) = ul * vl */
subs r2, r2, #1
bne 0b
adds r5, r5, r4 /* (lpl, c) = lpl + cl */
adc r4, ip, #0 /* cl = hpl + c */
subs r5, r7, r5 /* (lpl, !c) = rl - lpl */
sfi_breg r0, \
str r5, [\B], #4
it cc
addcc r4, r4, #1 /* cl += !c */
mov r0, r4 /* return carry */
pop { r4, r5, r6, r7 }
DO_RET (lr)
END (__mpn_submul_1)
|
