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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
dnl ARM mpn_bdiv_dbm1c.
dnl Copyright 2008, 2011, 2012 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C StrongARM ?
C XScale ?
C Cortex-A7 ?
C Cortex-A8 ?
C Cortex-A9 4.25
C Cortex-A15 2.5
C TODO
C * Try using umlal or umaal.
C * Try using ldm/stm.
define(`qp', `r0')
define(`up', `r1')
define(`n', `r2')
define(`bd', `r3')
define(`cy', `sp,#0')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_bdiv_dbm1c)
push {r4, r5, r6, r7, r8}
ldr r4, [up], #4
ldr r5, [sp, #20]
ands r12, n, #3
beq L(fi0)
cmp r12, #2
bcc L(fi1)
beq L(fi2)
L(fi3): umull r8, r12, r4, bd
ldr r4, [up], #4
b L(lo3)
L(fi0): umull r6, r7, r4, bd
ldr r4, [up], #4
b L(lo0)
L(fi1): subs n, n, #1
umull r8, r12, r4, bd
bls L(wd1)
ldr r4, [up], #4
b L(lo1)
L(fi2): umull r6, r7, r4, bd
ldr r4, [up], #4
b L(lo2)
L(top): ldr r4, [up], #4
subs r5, r5, r6
str r5, [qp], #4
sbc r5, r5, r7
L(lo1): umull r6, r7, r4, bd
ldr r4, [up], #4
subs r5, r5, r8
str r5, [qp], #4
sbc r5, r5, r12
L(lo0): umull r8, r12, r4, bd
ldr r4, [up], #4
subs r5, r5, r6
str r5, [qp], #4
sbc r5, r5, r7
L(lo3): umull r6, r7, r4, bd
ldr r4, [up], #4
subs r5, r5, r8
str r5, [qp], #4
sbc r5, r5, r12
L(lo2): subs n, n, #4
umull r8, r12, r4, bd
bhi L(top)
L(wd2): subs r5, r5, r6
str r5, [qp], #4
sbc r5, r5, r7
L(wd1): subs r5, r5, r8
str r5, [qp]
sbc r0, r5, r12
pop {r4, r5, r6, r7, r8}
return lr
EPILOGUE()
|
