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688903eb | 1 | /* Copyright (C) 1991-2018 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 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <string.h> |
19 | #include <memcopy.h> | |
20 | ||
92f1da4d UD |
21 | #undef memset |
22 | ||
ebbad4cc | 23 | void * |
85c2e611 | 24 | inhibit_loop_to_libcall |
9d46370c | 25 | memset (void *dstpp, int c, size_t len) |
28f540f4 RM |
26 | { |
27 | long int dstp = (long int) dstpp; | |
28 | ||
29 | if (len >= 8) | |
30 | { | |
31 | size_t xlen; | |
32 | op_t cccc; | |
33 | ||
34 | cccc = (unsigned char) c; | |
35 | cccc |= cccc << 8; | |
36 | cccc |= cccc << 16; | |
37 | if (OPSIZ > 4) | |
dfd2257a UD |
38 | /* Do the shift in two steps to avoid warning if long has 32 bits. */ |
39 | cccc |= (cccc << 16) << 16; | |
28f540f4 RM |
40 | |
41 | /* There are at least some bytes to set. | |
42 | No need to test for LEN == 0 in this alignment loop. */ | |
43 | while (dstp % OPSIZ != 0) | |
44 | { | |
45 | ((byte *) dstp)[0] = c; | |
46 | dstp += 1; | |
47 | len -= 1; | |
48 | } | |
49 | ||
50 | /* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */ | |
51 | xlen = len / (OPSIZ * 8); | |
52 | while (xlen > 0) | |
53 | { | |
54 | ((op_t *) dstp)[0] = cccc; | |
55 | ((op_t *) dstp)[1] = cccc; | |
56 | ((op_t *) dstp)[2] = cccc; | |
57 | ((op_t *) dstp)[3] = cccc; | |
58 | ((op_t *) dstp)[4] = cccc; | |
59 | ((op_t *) dstp)[5] = cccc; | |
60 | ((op_t *) dstp)[6] = cccc; | |
61 | ((op_t *) dstp)[7] = cccc; | |
62 | dstp += 8 * OPSIZ; | |
63 | xlen -= 1; | |
64 | } | |
65 | len %= OPSIZ * 8; | |
66 | ||
67 | /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */ | |
68 | xlen = len / OPSIZ; | |
69 | while (xlen > 0) | |
70 | { | |
71 | ((op_t *) dstp)[0] = cccc; | |
72 | dstp += OPSIZ; | |
73 | xlen -= 1; | |
74 | } | |
75 | len %= OPSIZ; | |
76 | } | |
77 | ||
78 | /* Write the last few bytes. */ | |
79 | while (len > 0) | |
80 | { | |
81 | ((byte *) dstp)[0] = c; | |
82 | dstp += 1; | |
83 | len -= 1; | |
84 | } | |
85 | ||
86 | return dstpp; | |
87 | } | |
85dd1003 | 88 | libc_hidden_builtin_def (memset) |