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Use intrinsic in pop_1st_bit() under MSVC 64 bits

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Around 1% speedup when compiled with MSVC 64

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-03-17 13:47:15 +01:00
parent 635be39acf
commit 5ea08e79c4
2 changed files with 16 additions and 7 deletions
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5
src/types.h
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@@ -77,9 +77,8 @@ typedef unsigned __int64 uint64_t;
#define IS_64BIT
#endif
// Automatic detection for use of bsfq asm-instruction under Windows.
// Works only in 64-bit mode. Does not work with MSVC.
#if defined(_WIN64) && defined(__INTEL_COMPILER)
// Automatic detection for use of bsfq asm-instruction under Windows
#if defined(_WIN64)
#define USE_BSFQ
#endif