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| author | DongHun Kwak <dh0128.kwak@samsung.com> | 2017-09-13 11:08:07 +0900 |
|---|---|---|
| committer | DongHun Kwak <dh0128.kwak@samsung.com> | 2017-09-13 11:09:00 +0900 |
| commit | b5c87084afaef42b2d058f68091be31988a6a874 (patch) | |
| tree | adef9a65870a41181687e11d57fdf98e7629de3c /boost/multiprecision/detail/bitscan.hpp | |
| parent | 34bd32e225e2a8a94104489b31c42e5801cc1f4a (diff) | |
| download | boost-b5c87084afaef42b2d058f68091be31988a6a874.tar.gz boost-b5c87084afaef42b2d058f68091be31988a6a874.tar.bz2 boost-b5c87084afaef42b2d058f68091be31988a6a874.zip | |
Imported Upstream version 1.64.0upstream/1.64.0
Change-Id: Id9212edd016dd55f21172c427aa7894d1d24148b
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
Diffstat (limited to 'boost/multiprecision/detail/bitscan.hpp')
| -rw-r--r-- | boost/multiprecision/detail/bitscan.hpp | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/boost/multiprecision/detail/bitscan.hpp b/boost/multiprecision/detail/bitscan.hpp index a21fd58651..21e8b8a3a9 100644 --- a/boost/multiprecision/detail/bitscan.hpp +++ b/boost/multiprecision/detail/bitscan.hpp @@ -8,6 +8,8 @@ #ifndef BOOST_MP_DETAIL_BITSCAN_HPP #define BOOST_MP_DETAIL_BITSCAN_HPP +#include <boost/detail/endian.hpp> + #if (defined(BOOST_MSVC) || (defined(__clang__) && defined(__c2__)) || (defined(BOOST_INTEL) && defined(_MSC_VER))) && (defined(_M_IX86) || defined(_M_X64)) #include <intrin.h> #endif @@ -140,6 +142,36 @@ BOOST_FORCEINLINE unsigned find_msb(boost::ulong_long_type mask, mpl::int_<3> co { return sizeof(boost::ulong_long_type) * CHAR_BIT - 1 - __builtin_clzll(mask); } +#ifdef BOOST_HAS_INT128 +BOOST_FORCEINLINE unsigned find_msb(unsigned __int128 mask, mpl::int_<0> const&) +{ + union { unsigned __int128 v; boost::uint64_t sv[2]; } val; + val.v = mask; +#ifdef BOOST_LITTLE_ENDIAN + if(val.sv[1]) + return find_msb(val.sv[1], mpl::int_<3>()) + 64; + return find_msb(val.sv[0], mpl::int_<3>()); +#else + if(val.sv[0]) + return find_msb(val.sv[0], mpl::int_<3>()) + 64; + return find_msb(val.sv[1], mpl::int_<3>()); +#endif +} +BOOST_FORCEINLINE unsigned find_lsb(unsigned __int128 mask, mpl::int_<0> const&) +{ + union { unsigned __int128 v; boost::uint64_t sv[2]; } val; + val.v = mask; +#ifdef BOOST_LITTLE_ENDIAN + if(val.sv[0] == 0) + return find_lsb(val.sv[1], mpl::int_<3>()) + 64; + return find_lsb(val.sv[0], mpl::int_<3>()); +#else + if(val.sv[1] == 0) + return find_lsb(val.sv[0], mpl::int_<3>()) + 64; + return find_lsb(val.sv[1], mpl::int_<3>()); +#endif +} +#endif template <class Unsigned> BOOST_FORCEINLINE unsigned find_lsb(Unsigned mask) |