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ae4b8d6a0e
It allows to remove a lot of arch-specific implementations. Checked on x86_64, aarch64, powerpc64. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <limits.h>
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#define ffsl __something_else
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#include <string.h>
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#undef ffsll
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#include <math-use-builtins.h>
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#include <libc-diag.h>
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/* Find the first bit set in I. */
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int
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__ffsll (long long int i)
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{
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#if USE_FFSLL_BUILTIN
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return __builtin_ffsll (i);
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#else
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unsigned long long int x = i & -i;
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if (x <= 0xffffffff)
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return ffs (i);
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else
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return 32 + ffs (i >> 32);
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#endif
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}
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weak_alias (__ffsll, ffsll)
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#if ULONG_MAX != UINT_MAX
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#undef ffsl
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weak_alias (ffsll, ffsl)
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#endif
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