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d614a753 | 1 | /* Copyright (C) 1991-2020 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <string.h> |
19 | #include <memcopy.h> | |
20 | ||
3c05dd79 WD |
21 | #ifndef MEMSET |
22 | # define MEMSET memset | |
23 | #endif | |
92f1da4d | 24 | |
ebbad4cc | 25 | void * |
85c2e611 | 26 | inhibit_loop_to_libcall |
3c05dd79 | 27 | MEMSET (void *dstpp, int c, size_t len) |
28f540f4 RM |
28 | { |
29 | long int dstp = (long int) dstpp; | |
30 | ||
31 | if (len >= 8) | |
32 | { | |
33 | size_t xlen; | |
34 | op_t cccc; | |
35 | ||
36 | cccc = (unsigned char) c; | |
37 | cccc |= cccc << 8; | |
38 | cccc |= cccc << 16; | |
39 | if (OPSIZ > 4) | |
dfd2257a UD |
40 | /* Do the shift in two steps to avoid warning if long has 32 bits. */ |
41 | cccc |= (cccc << 16) << 16; | |
28f540f4 RM |
42 | |
43 | /* There are at least some bytes to set. | |
44 | No need to test for LEN == 0 in this alignment loop. */ | |
45 | while (dstp % OPSIZ != 0) | |
46 | { | |
47 | ((byte *) dstp)[0] = c; | |
48 | dstp += 1; | |
49 | len -= 1; | |
50 | } | |
51 | ||
52 | /* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */ | |
53 | xlen = len / (OPSIZ * 8); | |
54 | while (xlen > 0) | |
55 | { | |
56 | ((op_t *) dstp)[0] = cccc; | |
57 | ((op_t *) dstp)[1] = cccc; | |
58 | ((op_t *) dstp)[2] = cccc; | |
59 | ((op_t *) dstp)[3] = cccc; | |
60 | ((op_t *) dstp)[4] = cccc; | |
61 | ((op_t *) dstp)[5] = cccc; | |
62 | ((op_t *) dstp)[6] = cccc; | |
63 | ((op_t *) dstp)[7] = cccc; | |
64 | dstp += 8 * OPSIZ; | |
65 | xlen -= 1; | |
66 | } | |
67 | len %= OPSIZ * 8; | |
68 | ||
69 | /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */ | |
70 | xlen = len / OPSIZ; | |
71 | while (xlen > 0) | |
72 | { | |
73 | ((op_t *) dstp)[0] = cccc; | |
74 | dstp += OPSIZ; | |
75 | xlen -= 1; | |
76 | } | |
77 | len %= OPSIZ; | |
78 | } | |
79 | ||
80 | /* Write the last few bytes. */ | |
81 | while (len > 0) | |
82 | { | |
83 | ((byte *) dstp)[0] = c; | |
84 | dstp += 1; | |
85 | len -= 1; | |
86 | } | |
87 | ||
88 | return dstpp; | |
89 | } | |
3c05dd79 | 90 | libc_hidden_builtin_def (MEMSET) |