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Use __lzcnt as __builtin_clz in VS2008 or up#101
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__lzcnt is documented here: https://msdn.microsoft.com/en-us/library/bb384809.aspx This improves speed of a VS2015 x64 build by more than 10%.
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__lzcnt is documented here:
https://msdn.microsoft.com/en-us/library/bb384809.aspx
This improves speed of a VS2015 x64 build by more than 10%.