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| author | Steve Block <steveblock@google.com> | 2010-02-02 14:57:50 +0000 |
|---|---|---|
| committer | Steve Block <steveblock@google.com> | 2010-02-04 15:06:55 +0000 |
| commit | d0825bca7fe65beaee391d30da42e937db621564 (patch) | |
| tree | 7461c49eb5844ffd1f35d1ba2c8b7584c1620823 /JavaScriptCore/wtf/StdLibExtras.h | |
| parent | 3db770bd97c5a59b6c7574ca80a39e5a51c1defd (diff) | |
| download | external_webkit-d0825bca7fe65beaee391d30da42e937db621564.zip external_webkit-d0825bca7fe65beaee391d30da42e937db621564.tar.gz external_webkit-d0825bca7fe65beaee391d30da42e937db621564.tar.bz2 | |
Merge webkit.org at r54127 : Initial merge by git
Change-Id: Ib661abb595522f50ea406f72d3a0ce17f7193c82
Diffstat (limited to 'JavaScriptCore/wtf/StdLibExtras.h')
| -rw-r--r-- | JavaScriptCore/wtf/StdLibExtras.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/JavaScriptCore/wtf/StdLibExtras.h b/JavaScriptCore/wtf/StdLibExtras.h index dd90c85..9dfb969 100644 --- a/JavaScriptCore/wtf/StdLibExtras.h +++ b/JavaScriptCore/wtf/StdLibExtras.h @@ -69,6 +69,14 @@ namespace WTF { return u.to; } + // Returns a count of the number of bits set in 'bits'. + inline size_t bitCount(unsigned bits) + { + bits = bits - ((bits >> 1) & 0x55555555); + bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333); + return (((bits + (bits >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24; + } + } // namespace WTF #endif |