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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/powerpc/power4/wordcopy.c
1 /* _memcopy.c -- subroutines for memory copy functions.
2 Copyright (C) 1991-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 /* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
24 /* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
25 block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
26 Both SRCP and DSTP should be aligned for memory operations on `op_t's. */
28 #ifndef WORDCOPY_FWD_ALIGNED
29 # define WORDCOPY_FWD_ALIGNED _wordcopy_fwd_aligned
33 WORDCOPY_FWD_ALIGNED (long int dstp
, long int srcp
, size_t len
)
39 ((op_t
*) dstp
)[0] = ((op_t
*) srcp
)[0];
50 a0
= ((op_t
*) srcp
)[0];
51 a1
= ((op_t
*) srcp
)[1];
52 ((op_t
*) dstp
)[0] = a0
;
53 ((op_t
*) dstp
)[1] = a1
;
62 /* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
63 block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
64 DSTP should be aligned for memory operations on `op_t's, but SRCP must
67 #ifndef WORDCOPY_FWD_DEST_ALIGNED
68 # define WORDCOPY_FWD_DEST_ALIGNED _wordcopy_fwd_dest_aligned
72 WORDCOPY_FWD_DEST_ALIGNED (long int dstp
, long int srcp
, size_t len
)
77 /* Calculate how to shift a word read at the memory operation
78 aligned srcp to make it aligned for copy. */
80 sh_1
= 8 * (srcp
% OPSIZ
);
81 sh_2
= 8 * OPSIZ
- sh_1
;
83 /* Make SRCP aligned by rounding it down to the beginning of the `op_t'
84 it points in the middle of. */
86 a0
= ((op_t
*) srcp
)[0];
90 a1
= ((op_t
*) srcp
)[1];
91 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);
104 a1
= ((op_t
*) srcp
)[1];
105 a2
= ((op_t
*) srcp
)[2];
106 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);
107 ((op_t
*) dstp
)[1] = MERGE (a1
, sh_1
, a2
, sh_2
);
117 /* _wordcopy_bwd_aligned -- Copy block finishing right before
118 SRCP to block finishing right before DSTP with LEN `op_t' words
119 (not LEN bytes!). Both SRCP and DSTP should be aligned for memory
120 operations on `op_t's. */
122 #ifndef WORDCOPY_BWD_ALIGNED
123 # define WORDCOPY_BWD_ALIGNED _wordcopy_bwd_aligned
127 WORDCOPY_BWD_ALIGNED (long int dstp
, long int srcp
, size_t len
)
135 ((op_t
*) dstp
)[0] = ((op_t
*) srcp
)[0];
147 a1
= ((op_t
*) srcp
)[1];
148 a0
= ((op_t
*) srcp
)[0];
149 ((op_t
*) dstp
)[1] = a1
;
150 ((op_t
*) dstp
)[0] = a0
;
157 /* _wordcopy_bwd_dest_aligned -- Copy block finishing right
158 before SRCP to block finishing right before DSTP with LEN `op_t'
159 words (not LEN bytes!). DSTP should be aligned for memory
160 operations on `op_t', but SRCP must *not* be aligned. */
162 #ifndef WORDCOPY_BWD_DEST_ALIGNED
163 # define WORDCOPY_BWD_DEST_ALIGNED _wordcopy_bwd_dest_aligned
167 WORDCOPY_BWD_DEST_ALIGNED (long int dstp
, long int srcp
, size_t len
)
172 /* Calculate how to shift a word read at the memory operation
173 aligned srcp to make it aligned for copy. */
175 sh_1
= 8 * (srcp
% OPSIZ
);
176 sh_2
= 8 * OPSIZ
- sh_1
;
178 /* Make srcp aligned by rounding it down to the beginning of the op_t
179 it points in the middle of. */
181 a2
= ((op_t
*) srcp
)[0];
187 a1
= ((op_t
*) srcp
)[0];
188 ((op_t
*) dstp
)[0] = MERGE (a1
, sh_1
, a2
, sh_2
);
202 a1
= ((op_t
*) srcp
)[1];
203 a0
= ((op_t
*) srcp
)[0];
204 ((op_t
*) dstp
)[1] = MERGE (a1
, sh_1
, a2
, sh_2
);
205 ((op_t
*) dstp
)[0] = MERGE (a0
, sh_1
, a1
, sh_2
);