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
{
size_t operator()(UInt128 x) const
{
return Hash128to64({x.first, x.second});
}
};
#if defined(__x86_64__)
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;
}
};
#else
/// На других платформах используем не обязательно CRC32. NOTE Это может сбить с толку.
struct UInt128HashCRC32 : public UInt128Hash {};
#endif
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); }
/** Используется при агрегации, для укладки большого количества ключей постоянной длины в хэш-таблицу.
*/
struct UInt256
{
UInt64 a;
UInt64 b;
UInt64 c;
UInt64 d;
bool operator== (const UInt256 rhs) const
{
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return a == rhs.a && b == rhs.b && c == rhs.c && d == rhs.d;
/* Так получается не лучше.
return 0xFFFF == _mm_movemask_epi8(_mm_and_si128(
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(&a)),
_mm_loadu_si128(reinterpret_cast<const __m128i *>(&rhs.a))),
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(&c)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(&rhs.c)))));*/
}
bool operator!= (const UInt256 rhs) const { return !operator==(rhs); }
bool operator== (const UInt64 rhs) const { return a == rhs && b == 0 && c == 0 && d == 0; }
bool operator!= (const UInt64 rhs) const { return !operator==(rhs); }
UInt256 & operator= (const UInt64 rhs) { a = rhs; b = 0; c = 0; d = 0; return *this; }
};
struct UInt256Hash
{
size_t operator()(UInt256 x) const
{
/// NOTE suboptimal
return Hash128to64({Hash128to64({x.a, x.b}), Hash128to64({x.c, x.d})});
}
};
#if defined(__x86_64__)
struct UInt256HashCRC32
{
size_t operator()(UInt256 x) const
{
UInt64 crc = -1ULL;
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.a));
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.b));
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.c));
asm("crc32q %[x], %[crc]\n" : [crc] "+r" (crc) : [x] "rm" (x.d));
return crc;
}
};
#else
/// На других платформах используем не обязательно CRC32. NOTE Это может сбить с толку.
struct UInt256HashCRC32
{
DefaultHash<UInt64> hash64;
size_t operator()(UInt256 x) const
{
/// TODO Это не оптимально.
return hash64(hash64(hash64(hash64(x.a) ^ x.b) ^ x.c) ^ x.d);
}
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};
#endif
inline void readBinary(UInt256 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
inline void writeBinary(const UInt256 & x, WriteBuffer & buf) { writePODBinary(x, buf); }
}