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Retire __popcnt64 intrinsic 

Just use _mm_popcnt_u64() that is available
both for MSVC abd Intel compiler.

Verified on MSVC that the produced assembly
has the hardware 'popcnt' instruction.

No functional change.
pull/664/head
Marco Costalba 2016-05-01 18:18:10 +02:00
parent 5486911e01
commit 5e4cd3fc0d
2 changed files with 2 additions and 6 deletions
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4
src/bitboard.h
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@ -272,10 +272,6 @@ inline int popcount(Bitboard b) {
return (int)_mm_popcnt_u64(b);
#elif defined(_MSC_VER)
return (int)__popcnt64(b);
#else // Assumed gcc or compatible compiler
return __builtin_popcountll(b);

4
src/types.h
View File

@ -60,12 +60,12 @@
/// _WIN64 Building on Windows 64 bit
#if defined(_WIN64) && defined(_MSC_VER) // No Makefile used
# include <intrin.h> // MSVC popcnt and bsfq instrinsics
# include <intrin.h> // Microsoft header for _BitScanForward64()
# define IS_64BIT
#endif
#if defined(USE_POPCNT) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))
# include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
# include <nmmintrin.h> // Intel and Microsoft header for _mm_popcnt_u64()
#endif
#if !defined(NO_PREFETCH) && (defined(__INTEL_COMPILER) || defined(_MSC_VER))