1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <limits.h>
19 #define ffsl __something_else
20 #include <string.h>
21
22 #undef ffsll
23
24 /* Find the first bit set in I. */
25 int
ffsll(long long int i)26 ffsll (long long int i)
27 {
28 unsigned long long int x = i & -i;
29
30 if (x <= 0xffffffff)
31 return ffs (i);
32 else
33 return 32 + ffs (i >> 32);
34 }
35
36 #if ULONG_MAX != UINT_MAX
37 #undef ffsl
38 weak_alias (ffsll, ffsl)
39 #endif
40