githubmirror/glibc

string/ffsll.c

45 строк1 KB

Paul Eggert

Update copyright dates with scripts/update-copyrights

01 янв 2025, 22:22

01 янв 2025, 22:222642002

/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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
   <https://www.gnu.org/licenses/>.  */

#include <limits.h>
#define ffsl __something_else
#include <string.h>
#undef	ffsll
#include <math-use-builtins.h>
#include <libc-diag.h>

/* Find the first bit set in I.  */
int
__ffsll (long long int i)
{
#if USE_FFSLL_BUILTIN
  return __builtin_ffsll (i);
#else
  unsigned long long int x = i & -i;

  if (x <= 0xffffffff)
    return ffs (i);
  else
    return 32 + ffs (i >> 32);
#endif
}
weak_alias (__ffsll, ffsll)

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