1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
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. |
8 | |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <string.h> |
19 | #include <memcopy.h> |
20 | |
21 | #ifndef MEMSET |
22 | # define MEMSET memset |
23 | #endif |
24 | |
25 | void * |
26 | inhibit_loop_to_libcall |
27 | MEMSET (void *dstpp, int c, size_t len) |
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) |
40 | /* Do the shift in two steps to avoid warning if long has 32 bits. */ |
41 | cccc |= (cccc << 16) << 16; |
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 | } |
90 | libc_hidden_builtin_def (MEMSET) |
91 | |