spot
2.12.2
spot
misc
clz.hh
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// -*- coding: utf-8 -*-
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// Copyright (C) by the Spot authors, see the AUTHORS file for details.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <spot/misc/common.hh>
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#include <cstddef>
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#include <climits>
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namespace
spot
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{
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template
<
typename
Type,
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typename
= std::enable_if_t<std::is_unsigned<Type>::value>>
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inline
constexpr
unsigned
clz(Type n)
noexcept
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{
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unsigned
res = CHAR_BIT *
sizeof
(Type);
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while
(n)
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{
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--res;
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n >>= 1;
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}
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return
res;
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}
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#if __GNUC__
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template
<>
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inline
constexpr
unsigned
clz(
unsigned
n)
noexcept
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{
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return
__builtin_clz(n);
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}
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template
<>
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inline
constexpr
unsigned
clz(
unsigned
long
n)
noexcept
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{
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return
__builtin_clzl(n);
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}
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template
<>
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inline
constexpr
unsigned
clz(
unsigned
long
long
n)
noexcept
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{
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return
__builtin_clzll(n);
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}
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#endif
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}
spot
Definition:
automata.hh:26
Please direct any
question
,
comment
, or
bug report
to the Spot mailing list at
spot@lrde.epita.fr
.
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