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Use __lzcnt as __builtin_clz in VS2008 or up #101

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Use __lzcnt as __builtin_clz in VS2008 or up #101

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5 changes: 5 additions & 0 deletions src/zopfli/util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,11 @@ Author: jyrki.alakuijala@gmail.com (Jyrki Alakuijala)
/* __builtin_clz available beginning with GCC 3.4 */
#elif __GNUC__ * 100 + __GNUC_MINOR__ >= 304
# define HAS_BUILTIN_CLZ
/* __lzcnt available beginning with Visual Studio 2008 */
#elif _MSC_VER >= 1500
# include <intrin.h>
# define __builtin_clz __lzcnt
# define HAS_BUILTIN_CLZ
#endif

int ZopfliGetDistExtraBits(int dist) {
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