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| author | drepper <drepper@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-26 13:10:26 +0000 |
|---|---|---|
| committer | drepper <drepper@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-26 13:10:26 +0000 |
| commit | 57cfd4fb9a049e97dae1f4a4f690a9b420c7a690 (patch) | |
| tree | d5c233ccf0c5f5286596adc884901cd6d3f6a413 /libstdc++-v3/include/bits/random.h | |
| parent | 3f4257112ebaa98abb97d3170ad95eafd8998261 (diff) | |
| download | ppe42-gcc-57cfd4fb9a049e97dae1f4a4f690a9b420c7a690.tar.gz ppe42-gcc-57cfd4fb9a049e97dae1f4a4f690a9b420c7a690.zip | |
2012-09-26 Ulrich Drepper <drepper@gmail.com>
Optimize bulk mode for normal_distribution<double> for SSE3.
* configure.host: Define cpu_opt_bits_random.
* configure.ac: Substitute CPU_OPT_BITS_RANDOM.
* include/Makefile.am (bits_headers): Add ${bits_host_headers}.
(bits_host_headers): Define.
* include/bits/random.tcc: Move __details::_Power_of_2 to...
* include/bits/random.h: ...here.
* include/std/random: Include <bits/opt_random.h>.
* config/cpu/i486/opt/bits/opt_random.h: New file.
* config/cpu/generic/opt/bits/opt_random.h: New file.
* configure: Regenerated.
* Makefile.in: Regenerated.
* aclocal.m4: Regenerated.
* doc/Makefile.in: Regenerated.
* include/Makefile.in: Regenerated.
* libsupc++/Makefile.in: Regenerated.
* po/Makefile.in: Regenerated.
* python/Makefile.in: Regenerated.
* src/Makefile.in: Regenerated.
* src/c++11/Makefile.in: Regenerated.
* src/c++98/Makefile.in: Regenerated.
* testsuite/Makefile.in: Regenerated.
* config/cpu/generic/opt/ext/opt_random.h: Fix comment.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191758 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libstdc++-v3/include/bits/random.h')
| -rw-r--r-- | libstdc++-v3/include/bits/random.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libstdc++-v3/include/bits/random.h b/libstdc++-v3/include/bits/random.h index e9b99718f97..3db6916ad96 100644 --- a/libstdc++-v3/include/bits/random.h +++ b/libstdc++-v3/include/bits/random.h @@ -149,6 +149,14 @@ _GLIBCXX_END_NAMESPACE_VERSION __mod(_Tp __x) { return _Mod<_Tp, __m, __a, __c>::__calc(__x); } + /* Determine whether number is a power of 2. */ + template<typename _Tp> + inline bool + _Power_of_2(_Tp __x) + { + return ((__x - 1) & __x) == 0; + }; + /* * An adaptor class for converting the output of any Generator into * the input for a specific Distribution. |
