ClickHouse/dbms/include/DB/Common/UInt128.h

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#pragma once
#include <DB/Common/HashTable/Hash.h>
#include <DB/IO/ReadHelpers.h>
#include <DB/IO/WriteHelpers.h>
namespace DB
{
/// Для агрегации по SipHash или конкатенации нескольких полей.
struct UInt128
{
UInt64 first;
UInt64 second;
bool operator== (const UInt128 rhs) const { return first == rhs.first && second == rhs.second; }
bool operator!= (const UInt128 rhs) const { return first != rhs.first || second != rhs.second; }
bool operator== (const UInt64 rhs) const { return first == rhs && second == 0; }
bool operator!= (const UInt64 rhs) const { return first != rhs || second != 0; }
UInt128 & operator= (const UInt64 rhs) { first = rhs; second = 0; return *this; }
};
struct UInt128Hash
{
DefaultHash<UInt64> hash64;
size_t operator()(UInt128 x) const { return hash64(hash64(x.first) ^ x.second); }
};
struct UInt128HashCRC32
{
size_t operator()(UInt128 x) const
{
UInt64 crc = -1ULL;
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.first));
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.second));
return crc;
}
};
struct UInt128TrivialHash
{
size_t operator()(UInt128 x) const { return x.first; }
};
inline void readBinary(UInt128 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
inline void writeBinary(const UInt128 & x, WriteBuffer & buf) { writePODBinary(x, buf); }
}