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add C++1y bit operations (partial)

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bolero-MURAKAMI 2014-03-31 14:58:24 +09:00
parent 1bb9336d34
commit 56c9d52436
17 changed files with 435 additions and 67 deletions
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sprout/bit/clrsb.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2014 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_BIT_CLRSB_HPP
#define SPROUT_BIT_CLRSB_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/bit/clz.hpp>
namespace sprout {
namespace detail {
# if SPROUT_USE_BUILTIN_BIT_OPERATION
inline SPROUT_CONSTEXPR int
clrsb(unsigned x) {
return __builtin_clrsb(x);
}
inline SPROUT_CONSTEXPR int
clrsb(unsigned long x) {
return __builtin_clrsbl(x);
}
inline SPROUT_CONSTEXPR int
clrsb(unsigned long long x) {
return __builtin_clrsbll(x);
}
# endif
template<typename Integral>
inline SPROUT_CONSTEXPR int
clrsb(Integral x) {
return sprout::clz(~x);
}
} // namespace detail
//
// clrsb
//
template<typename Integral>
inline SPROUT_CONSTEXPR typename std::enable_if<
std::is_integral<Integral>::value,
int
>::type
clrsb(Integral x) {
return sprout::detail::clrsb(x);
}
} // namespace sprout
#endif // #ifndef SPROUT_BIT_CLRSB_HPP