mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-24 02:30:51 +00:00
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
#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); }
|
||
};
|
||
|
||
#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
|
||
{
|
||
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)),
|
||
_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; }
|
||
};
|
||
|
||
#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);
|
||
}
|
||
};
|
||
|
||
#endif
|
||
|
||
inline void readBinary(UInt256 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void writeBinary(const UInt256 & x, WriteBuffer & buf) { writePODBinary(x, buf); }
|
||
|
||
}
|