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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
# Alpha EV5 __mpn_rshift --
# Copyright (C) 1994, 1995 Free Software Foundation, Inc.
# This file is part of the GNU MP Library.
# The GNU MP Library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
# The GNU MP 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 Library General Public
# License for more details.
# You should have received a copy of the GNU Library General Public License
# along with the GNU MP Library; see the file COPYING.LIB. If not, write to
# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
# INPUT PARAMETERS
# res_ptr r16
# s1_ptr r17
# size r18
# cnt r19
# This code runs at 4.25 cycles/limb on the EV5.
.set noreorder
.set noat
.text
.align 3
.globl __mpn_rshift
.ent __mpn_rshift
__mpn_rshift:
.frame $30,0,$26,0
ldq $4,0($17) # load first limb
subq $31,$19,$20
subq $18,1,$18
and $18,4-1,$28 # number of limbs in first loop
sll $4,$20,$0 # compute function result
beq $28,L0
subq $18,$28,$18
.align 3
Loop0: ldq $3,8($17)
addq $16,8,$16
srl $4,$19,$5
addq $17,8,$17
subq $28,1,$28
sll $3,$20,$6
or $3,$3,$4
or $5,$6,$8
stq $8,-8($16)
bne $28,Loop0
L0: srl $4,$19,$24
beq $18,Lend
# warm up phase 1
ldq $1,8($17)
subq $18,4,$18
ldq $2,16($17)
ldq $3,24($17)
ldq $4,32($17)
beq $18,Lcool1
# warm up phase 2
sll $1,$20,$7
srl $1,$19,$21
sll $2,$20,$8
ldq $1,40($17)
srl $2,$19,$22
ldq $2,48($17)
sll $3,$20,$5
or $7,$24,$7
srl $3,$19,$23
or $8,$21,$8
sll $4,$20,$6
ldq $3,56($17)
srl $4,$19,$24
ldq $4,64($17)
subq $18,4,$18
beq $18,Lcool2
.align 4
# main loop
Loop: stq $7,0($16)
or $5,$22,$5
stq $8,8($16)
or $6,$23,$6
sll $1,$20,$7
subq $18,4,$18
srl $1,$19,$21
unop # ldq $31,-96($17)
sll $2,$20,$8
ldq $1,72($17)
srl $2,$19,$22
ldq $2,80($17)
stq $5,16($16)
or $7,$24,$7
stq $6,24($16)
or $8,$21,$8
sll $3,$20,$5
unop # ldq $31,-96($17)
srl $3,$19,$23
addq $16,32,$16
sll $4,$20,$6
ldq $3,88($17)
srl $4,$19,$24
ldq $4,96($17)
addq $17,32,$17
bne $18,Loop
unop
unop
# cool down phase 2/1
Lcool2: stq $7,0($16)
or $5,$22,$5
stq $8,8($16)
or $6,$23,$6
sll $1,$20,$7
srl $1,$19,$21
sll $2,$20,$8
srl $2,$19,$22
stq $5,16($16)
or $7,$24,$7
stq $6,24($16)
or $8,$21,$8
sll $3,$20,$5
srl $3,$19,$23
sll $4,$20,$6
srl $4,$19,$24
# cool down phase 2/2
stq $7,32($16)
or $5,$22,$5
stq $8,40($16)
or $6,$23,$6
stq $5,48($16)
stq $6,56($16)
# cool down phase 2/3
stq $24,64($16)
ret $31,($26),1
# cool down phase 1/1
Lcool1: sll $1,$20,$7
srl $1,$19,$21
sll $2,$20,$8
srl $2,$19,$22
sll $3,$20,$5
or $7,$24,$7
srl $3,$19,$23
or $8,$21,$8
sll $4,$20,$6
srl $4,$19,$24
# cool down phase 1/2
stq $7,0($16)
or $5,$22,$5
stq $8,8($16)
or $6,$23,$6
stq $5,16($16)
stq $6,24($16)
stq $24,32($16)
ret $31,($26),1
Lend: stq $24,0($16)
ret $31,($26),1
.end __mpn_rshift
|
