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Update intHash.

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This commit is contained in:
Nikolai Kochetov 2020-03-23 22:21:15 +03:00
parent 3c31139db8
commit 9e105b877c
1 changed files with 14 additions and 0 deletions
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14
dbms/src/Common/HashTable/Hash.h
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@ -71,6 +71,20 @@ inline DB::UInt64 intHashCRC32(DB::UInt64 x, DB::UInt64 updated_value)
#endif
}
template <typename T>
inline typename std::enable_if<(sizeof(T) > sizeof(DB::UInt64)), DB::UInt64>::type
intHashCRC32(const T & x, DB::UInt64 updated_value)
{
auto * begin64 = reinterpret_cast<const UInt64 *>(&x);
for (size_t i = 0; i < sizeof(T); i += sizeof(UInt64))
{
updated_value = intHashCRC32(*begin64, updated_value);
++begin64;
}
return updated_value;
}
inline UInt32 updateWeakHash32(const DB::UInt8 * pos, size_t size, DB::UInt32 updated_value)
{
if (size < 8)