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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/* _memcopy.c -- subroutines for memory copy functions.
Copyright (C) 1991-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Torbjorn Granlund (tege@sics.se).
Updated for POWER6 by Steven Munroe (sjmunroe@us.ibm.com).
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
<https://www.gnu.org/licenses/>. */
/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
#include <stddef.h>
#include <memcopy.h>
/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
Both SRCP and DSTP should be aligned for memory operations on `op_t's. */
#ifndef WORDCOPY_FWD_ALIGNED
# define WORDCOPY_FWD_ALIGNED _wordcopy_fwd_aligned
#endif
void
WORDCOPY_FWD_ALIGNED (long int dstp, long int srcp, size_t len)
{
op_t a0, a1;
if (len & 1)
{
((op_t *) dstp)[0] = ((op_t *) srcp)[0];
if (len == 1)
return;
srcp += OPSIZ;
dstp += OPSIZ;
len -= 1;
}
do
{
a0 = ((op_t *) srcp)[0];
a1 = ((op_t *) srcp)[1];
((op_t *) dstp)[0] = a0;
((op_t *) dstp)[1] = a1;
srcp += 2 * OPSIZ;
dstp += 2 * OPSIZ;
len -= 2;
}
while (len != 0);
}
/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
DSTP should be aligned for memory operations on `op_t's, but SRCP must
*not* be aligned. */
#define fwd_align_merge(align) \
do \
{ \
a1 = ((op_t *) srcp)[1]; \
a2 = ((op_t *) srcp)[2]; \
((op_t *) dstp)[0] = MERGE (a0, align*8, a1, (__WORDSIZE-align*8)); \
((op_t *) dstp)[1] = MERGE (a1, align*8, a2, (__WORDSIZE-align*8)); \
a0 = a2; \
srcp += 2 * OPSIZ; \
dstp += 2 * OPSIZ; \
len -= 2; \
} \
while (len != 0)
#ifndef WORDCOPY_FWD_DEST_ALIGNED
# define WORDCOPY_FWD_DEST_ALIGNED _wordcopy_fwd_dest_aligned
#endif
void
WORDCOPY_FWD_DEST_ALIGNED (long int dstp, long int srcp, size_t len)
{
op_t a0, a1, a2;
int sh_1, sh_2;
int align;
/* Calculate how to shift a word read at the memory operation
aligned srcp to make it aligned for copy. */
align = srcp % OPSIZ;
sh_1 = 8 * (srcp % OPSIZ);
sh_2 = 8 * OPSIZ - sh_1;
/* Make SRCP aligned by rounding it down to the beginning of the `op_t'
it points in the middle of. */
srcp &= -OPSIZ;
a0 = ((op_t *) srcp)[0];
if (len & 1)
{
a1 = ((op_t *) srcp)[1];
((op_t *) dstp)[0] = MERGE (a0, sh_1, a1, sh_2);
if (len == 1)
return;
a0 = a1;
srcp += OPSIZ;
dstp += OPSIZ;
len -= 1;
}
fwd_align_merge (align);
}
/* _wordcopy_bwd_aligned -- Copy block finishing right before
SRCP to block finishing right before DSTP with LEN `op_t' words
(not LEN bytes!). Both SRCP and DSTP should be aligned for memory
operations on `op_t's. */
#ifndef WORDCOPY_BWD_ALIGNED
# define WORDCOPY_BWD_ALIGNED _wordcopy_bwd_aligned
#endif
void
WORDCOPY_BWD_ALIGNED (long int dstp, long int srcp, size_t len)
{
op_t a0, a1;
if (len & 1)
{
srcp -= OPSIZ;
dstp -= OPSIZ;
((op_t *) dstp)[0] = ((op_t *) srcp)[0];
if (len == 1)
return;
len -= 1;
}
do
{
srcp -= 2 * OPSIZ;
dstp -= 2 * OPSIZ;
a1 = ((op_t *) srcp)[1];
a0 = ((op_t *) srcp)[0];
((op_t *) dstp)[1] = a1;
((op_t *) dstp)[0] = a0;
len -= 2;
}
while (len != 0);
}
#define bwd_align_merge(align) \
do \
{ \
srcp -= 2 * OPSIZ; \
dstp -= 2 * OPSIZ; \
a1 = ((op_t *) srcp)[1]; \
a0 = ((op_t *) srcp)[0]; \
((op_t *) dstp)[1] = MERGE (a1, align*8, a2, (__WORDSIZE-align*8)); \
((op_t *) dstp)[0] = MERGE (a0, align*8, a1, (__WORDSIZE-align*8)); \
a2 = a0; \
len -= 2; \
} \
while (len != 0)
/* _wordcopy_bwd_dest_aligned -- Copy block finishing right
before SRCP to block finishing right before DSTP with LEN `op_t'
words (not LEN bytes!). DSTP should be aligned for memory
operations on `op_t', but SRCP must *not* be aligned. */
#ifndef WORDCOPY_BWD_DEST_ALIGNED
# define WORDCOPY_BWD_DEST_ALIGNED _wordcopy_bwd_dest_aligned
#endif
void
WORDCOPY_BWD_DEST_ALIGNED (long int dstp, long int srcp, size_t len)
{
op_t a0, a1, a2;
int sh_1, sh_2;
int align;
/* Calculate how to shift a word read at the memory operation
aligned srcp to make it aligned for copy. */
align = srcp % OPSIZ;
sh_1 = 8 * (srcp % OPSIZ);
sh_2 = 8 * OPSIZ - sh_1;
/* Make srcp aligned by rounding it down to the beginning of the op_t
it points in the middle of. */
srcp &= -OPSIZ;
a2 = ((op_t *) srcp)[0];
if (len & 1)
{
srcp -= OPSIZ;
dstp -= OPSIZ;
a1 = ((op_t *) srcp)[0];
((op_t *) dstp)[0] = MERGE (a1, sh_1, a2, sh_2);
if (len == 1)
return;
a2 = a1;
len -= 1;
}
bwd_align_merge (align);
}
|
