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Implement __builtin_clz in MSVC#102
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This include _BitScanReverse support which I sent a PR: google/zopfli#102 and some other minor changes.
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Rebased, PTAL. |
_BitScanReverse is documented here: https://msdn.microsoft.com/en-us/library/fbxyd7zd.aspx This improves speed of a VS2015 x64 build by more than 10%.
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Updated the change to be less intrusive. |
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_BitScanReverse is documented here:
https://msdn.microsoft.com/en-us/library/fbxyd7zd.aspx
This improves speed of a VS2015 x64 build by more than 10%.