mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* Copyright (C) 1991-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <memcopy.h>
|
|
|
|
#ifndef MEMSET
|
|
# define MEMSET memset
|
|
#endif
|
|
|
|
void *
|
|
inhibit_loop_to_libcall
|
|
MEMSET (void *dstpp, int c, size_t len)
|
|
{
|
|
long int dstp = (long int) dstpp;
|
|
|
|
if (len >= 8)
|
|
{
|
|
size_t xlen;
|
|
op_t cccc;
|
|
|
|
cccc = (unsigned char) c;
|
|
cccc |= cccc << 8;
|
|
cccc |= cccc << 16;
|
|
if (OPSIZ > 4)
|
|
/* Do the shift in two steps to avoid warning if long has 32 bits. */
|
|
cccc |= (cccc << 16) << 16;
|
|
|
|
/* There are at least some bytes to set.
|
|
No need to test for LEN == 0 in this alignment loop. */
|
|
while (dstp % OPSIZ != 0)
|
|
{
|
|
((byte *) dstp)[0] = c;
|
|
dstp += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
/* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */
|
|
xlen = len / (OPSIZ * 8);
|
|
while (xlen > 0)
|
|
{
|
|
((op_t *) dstp)[0] = cccc;
|
|
((op_t *) dstp)[1] = cccc;
|
|
((op_t *) dstp)[2] = cccc;
|
|
((op_t *) dstp)[3] = cccc;
|
|
((op_t *) dstp)[4] = cccc;
|
|
((op_t *) dstp)[5] = cccc;
|
|
((op_t *) dstp)[6] = cccc;
|
|
((op_t *) dstp)[7] = cccc;
|
|
dstp += 8 * OPSIZ;
|
|
xlen -= 1;
|
|
}
|
|
len %= OPSIZ * 8;
|
|
|
|
/* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */
|
|
xlen = len / OPSIZ;
|
|
while (xlen > 0)
|
|
{
|
|
((op_t *) dstp)[0] = cccc;
|
|
dstp += OPSIZ;
|
|
xlen -= 1;
|
|
}
|
|
len %= OPSIZ;
|
|
}
|
|
|
|
/* Write the last few bytes. */
|
|
while (len > 0)
|
|
{
|
|
((byte *) dstp)[0] = c;
|
|
dstp += 1;
|
|
len -= 1;
|
|
}
|
|
|
|
return dstpp;
|
|
}
|
|
libc_hidden_builtin_def (MEMSET)
|