summary refs log tree commit diff
path: root/string/ffsll.c
blob: 482a1f647d6e1a594bde35fe5e6c24b6783c4e0d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Torbjorn Granlund (tege@sics.se).

   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 <limits.h>
#define ffsl __something_else
#include <string.h>

#undef	ffsll

/* Find the first bit set in I.  */
int
ffsll (long long int i)
{
  unsigned long long int x = i & -i;

  if (x <= 0xffffffff)
    return ffs (i);
  else
    return 32 + ffs (i >> 32);
}

#if ULONG_MAX != UINT_MAX
#undef ffsl
weak_alias (ffsll, ffsl)
#endif