|
Packit Service |
82fcde |
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
|
|
Packit Service |
82fcde |
This file is part of the GNU C Library.
|
|
Packit Service |
82fcde |
Contributed by Torbjorn Granlund (tege@sics.se).
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit Service |
82fcde |
modify it under the terms of the GNU Lesser General Public
|
|
Packit Service |
82fcde |
License as published by the Free Software Foundation; either
|
|
Packit Service |
82fcde |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit Service |
82fcde |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit Service |
82fcde |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit Service |
82fcde |
Lesser General Public License for more details.
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
You should have received a copy of the GNU Lesser General Public
|
|
Packit Service |
82fcde |
License along with the GNU C Library; if not, see
|
|
Packit Service |
82fcde |
<http://www.gnu.org/licenses/>. */
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
#include <limits.h>
|
|
Packit Service |
82fcde |
#define ffsl __something_else
|
|
Packit Service |
82fcde |
#include <string.h>
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
#undef ffs
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
/* Find the first bit set in I. */
|
|
Packit Service |
82fcde |
int
|
|
Packit Service |
82fcde |
__ffs (int i)
|
|
Packit Service |
82fcde |
{
|
|
Packit Service |
82fcde |
static const unsigned char table[] =
|
|
Packit Service |
82fcde |
{
|
|
Packit Service |
82fcde |
0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
|
|
Packit Service |
82fcde |
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
|
|
Packit Service |
82fcde |
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
Packit Service |
82fcde |
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
Packit Service |
82fcde |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
|
|
Packit Service |
82fcde |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
|
|
Packit Service |
82fcde |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
|
|
Packit Service |
82fcde |
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
|
|
Packit Service |
82fcde |
};
|
|
Packit Service |
82fcde |
unsigned int a;
|
|
Packit Service |
82fcde |
unsigned int x = i & -i;
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
a = x <= 0xffff ? (x <= 0xff ? 0 : 8) : (x <= 0xffffff ? 16 : 24);
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
return table[x >> a] + a;
|
|
Packit Service |
82fcde |
}
|
|
Packit Service |
82fcde |
weak_alias (__ffs, ffs)
|
|
Packit Service |
82fcde |
libc_hidden_def (__ffs)
|
|
Packit Service |
82fcde |
libc_hidden_builtin_def (ffs)
|
|
Packit Service |
82fcde |
|
|
Packit Service |
82fcde |
#if ULONG_MAX == UINT_MAX
|
|
Packit Service |
82fcde |
#undef ffsl
|
|
Packit Service |
82fcde |
weak_alias (__ffs, ffsl)
|
|
Packit Service |
82fcde |
#endif
|