text: /* Copyright (C) 2011-2016 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>
  
  size_t
  strlen (const char *s)
  {
    /* Get an aligned pointer. */
    const uintptr_t s_int = (uintptr_t) s;
    const uint32_t *p = (const uint32_t *) (s_int & -4);
  
    /* Read the first word, but force bytes before the string to be nonzero.
       This expression works because we know shift counts are taken mod 32.  */
    uint32_t v = *p | ((1 << (s_int << 3)) - 1);
  
    uint32_t bits;
    while ((bits = __insn_seqb (v, 0)) == 0)
      v = *++p;
  
    return ((const char *) p) + (__insn_ctz (bits) >> 3) - s;
  }
  libc_hidden_builtin_def (strlen)
  