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Use popcount intrinsic with Interl compiler

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It seems that icc used our fallback version of popcount.
Now use intrinsics.

icc version 16.0.2 (gcc version 5.3.0 compatibility)
bmi2 compile
uname -r 4.5.1-1-ARCH

20xbench gives a nice speedup
./stockfish-icc-master 2161515 +- 34462
./stockfish-icc-sse42 2260857 +- 50349
This commit is contained in:
erbsenzaehler
2016-05-01 10:57:50 +02:00
committed by Marco Costalba
parent 8f934dff9a
commit 2dd24dc4e6
2 changed files with 2 additions and 2 deletions
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2
src/bitboard.h
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@@ -268,7 +268,7 @@ inline int popcount(Bitboard b) {
union { Bitboard bb; uint16_t u[4]; } v = { b };
return PopCnt16[v.u[0]] + PopCnt16[v.u[1]] + PopCnt16[v.u[2]] + PopCnt16[v.u[3]];
#elif defined(_MSC_VER) && defined(__INTEL_COMPILER)
#elif defined(_MSC_VER) || defined(__INTEL_COMPILER)
return _mm_popcnt_u64(b);