1 /* _memcopy.c -- subroutines for memory copy functions.
2 Copyright (C) 1991-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Torbjorn Granlund (tege@sics.se).
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
20 /* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
25 /* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
26 block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
27 Both SRCP and DSTP should be aligned for memory operations on `op_t's. */
29 #ifndef WORDCOPY_FWD_ALIGNED
30 # define WORDCOPY_FWD_ALIGNED _wordcopy_fwd_aligned
34 WORDCOPY_FWD_ALIGNED (long int dstp
, long int srcp
, size_t len
)
40 ((op_t
*) dstp
)[0] = ((op_t
*) srcp
)[0];
51 a0
= ((op_t
*) srcp
)[0];
52 a1
= ((op_t
*) srcp
)[1];
53 ((op_t
*) dstp
)[0] = a0
;
54 ((op_t
*) dstp
)[1] = a1
;
63 /* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
64 block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
65 DSTP should be aligned for memory operations on `op_t's, but SRCP must
68 #ifndef WORDCOPY_FWD_DEST_ALIGNED
69 # define WORDCOPY_FWD_DEST_ALIGNED _wordcopy_fwd_dest_aligned
73 WORDCOPY_FWD_DEST_ALIGNED (long int dstp
, long int srcp
, size_t len
)
78 /* Calculate how to shift a word read at the memory operation
79 aligned srcp to make it aligned for copy. */
81 sh_1
= 8 * (srcp
% OPSIZ
);
82 sh_2
= 8 * OPSIZ
- sh_1
;
84 /* Make SRCP aligned by rounding it down to the beginning of the `op_t'
85 it points in the middle of. */
87 a0
= ((op_t
*) srcp
)[0];
91 a1
= ((op_t
*) srcp
)[1];
92 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);
105 a1
= ((op_t
*) srcp
)[1];
106 a2
= ((op_t
*) srcp
)[2];
107 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);
108 ((op_t
*) dstp
)[1] = MERGE (a1
, sh_1
, a2
, sh_2
);
118 /* _wordcopy_bwd_aligned -- Copy block finishing right before
119 SRCP to block finishing right before DSTP with LEN `op_t' words
120 (not LEN bytes!). Both SRCP and DSTP should be aligned for memory
121 operations on `op_t's. */
123 #ifndef WORDCOPY_BWD_ALIGNED
124 # define WORDCOPY_BWD_ALIGNED _wordcopy_bwd_aligned
128 WORDCOPY_BWD_ALIGNED (long int dstp
, long int srcp
, size_t len
)
136 ((op_t
*) dstp
)[0] = ((op_t
*) srcp
)[0];
148 a1
= ((op_t
*) srcp
)[1];
149 a0
= ((op_t
*) srcp
)[0];
150 ((op_t
*) dstp
)[1] = a1
;
151 ((op_t
*) dstp
)[0] = a0
;
158 /* _wordcopy_bwd_dest_aligned -- Copy block finishing right
159 before SRCP to block finishing right before DSTP with LEN `op_t'
160 words (not LEN bytes!). DSTP should be aligned for memory
161 operations on `op_t', but SRCP must *not* be aligned. */
163 #ifndef WORDCOPY_BWD_DEST_ALIGNED
164 # define WORDCOPY_BWD_DEST_ALIGNED _wordcopy_bwd_dest_aligned
168 WORDCOPY_BWD_DEST_ALIGNED (long int dstp
, long int srcp
, size_t len
)
173 /* Calculate how to shift a word read at the memory operation
174 aligned srcp to make it aligned for copy. */
176 sh_1
= 8 * (srcp
% OPSIZ
);
177 sh_2
= 8 * OPSIZ
- sh_1
;
179 /* Make srcp aligned by rounding it down to the beginning of the op_t
180 it points in the middle of. */
182 a2
= ((op_t
*) srcp
)[0];
188 a1
= ((op_t
*) srcp
)[0];
189 ((op_t
*) dstp
)[0] = MERGE (a1
, sh_1
, a2
, sh_2
);
203 a1
= ((op_t
*) srcp
)[1];
204 a0
= ((op_t
*) srcp
)[0];
205 ((op_t
*) dstp
)[1] = MERGE (a1
, sh_1
, a2
, sh_2
);
206 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);