mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include "string-endian.h"
|
|
|
|
size_t
|
|
strlen (const char *s)
|
|
{
|
|
/* Get an aligned pointer. */
|
|
const uintptr_t s_int = (uintptr_t) s;
|
|
const uint64_t *p = (const uint64_t *) (s_int & -8);
|
|
|
|
/* Read and MASK the first word. */
|
|
uint64_t v = *p | MASK (s_int);
|
|
|
|
uint64_t bits;
|
|
while ((bits = __insn_v1cmpeqi (v, 0)) == 0)
|
|
v = *++p;
|
|
|
|
return ((const char *) p) + (CFZ (bits) >> 3) - s;
|
|
}
|
|
libc_hidden_builtin_def (strlen)
|