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Use popcount intrinsic with Interl compiler
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
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