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bitCount performance: special handling for Int16 and Int8

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ikopylov 2020-01-20 19:36:03 +03:00 committed by GitHub
parent 1e72b37a21
commit f5f36f0199
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1 changed files with 4 additions and 0 deletions
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dbms/src/Functions/bitCount.cpp
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@ -20,6 +20,10 @@ struct BitCountImpl
return __builtin_popcountll(a); return __builtin_popcountll(a);
if constexpr (std::is_same_v<A, UInt32> || std::is_same_v<A, Int32> || std::is_unsigned_v<A>) if constexpr (std::is_same_v<A, UInt32> || std::is_same_v<A, Int32> || std::is_unsigned_v<A>)
return __builtin_popcount(a); return __builtin_popcount(a);
if constexpr (std::is_same_v<A, Int16>)
return __builtin_popcount(static_cast<UInt16>(a));
if constexpr (std::is_same_v<A, Int8>)
return __builtin_popcount(static_cast<UInt8>(a));
else else
return __builtin_popcountll(ext::bit_cast<unsigned long long>(a)); return __builtin_popcountll(ext::bit_cast<unsigned long long>(a));
} }