mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-19 16:20:50 +00:00
b7ef5a699c
* Get rid of non-existent vectorclass * Move FastMemcpy to contribs * Restore comments * Disable FastMemcpy on non-Linux * Fix cmake file * Don't build FastMemcpy for ARM64 * Replace FastMemcpy submodule with its contents * Fix cmake file * Move widechar_width to contrib/ * Move sumbur to contrib/ * Move consistent-hashing to contrib/ * Fix UBSan tests
55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
#pragma once
|
|
|
|
#include <stdint.h>
|
|
#include <cstddef>
|
|
#include <type_traits>
|
|
using std::size_t;
|
|
|
|
#include "bitops.h"
|
|
|
|
#if defined(_MSC_VER)
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
|
|
static inline uint32_t PopCountImpl(uint8_t n) {
|
|
extern uint8_t const* PopCountLUT8;
|
|
return PopCountLUT8[n];
|
|
}
|
|
|
|
static inline uint32_t PopCountImpl(uint16_t n) {
|
|
#if defined(_MSC_VER)
|
|
return __popcnt16(n);
|
|
#else
|
|
extern uint8_t const* PopCountLUT16;
|
|
return PopCountLUT16[n];
|
|
#endif
|
|
}
|
|
|
|
static inline uint32_t PopCountImpl(uint32_t n) {
|
|
#if defined(_MSC_VER)
|
|
return __popcnt(n);
|
|
#elif defined(__GNUC__) // it is true for Clang also
|
|
return __builtin_popcount(n);
|
|
#else
|
|
return PopCountImpl((uint16_t)LO_16(n)) + PopCountImpl((uint16_t)HI_16(n));
|
|
#endif
|
|
}
|
|
|
|
static inline uint32_t PopCountImpl(uint64_t n) {
|
|
#if defined(_MSC_VER) && !defined(_i386_)
|
|
return __popcnt64(n);
|
|
#elif defined(__GNUC__) // it is true for Clang also
|
|
return __builtin_popcountll(n);
|
|
#else
|
|
return PopCountImpl((uint32_t)LO_32(n)) + PopCountImpl((uint32_t)HI_32(n));
|
|
#endif
|
|
}
|
|
|
|
template <class T>
|
|
static inline uint32_t PopCount(T n) {
|
|
using TCvt = std::make_unsigned_t<std::decay_t<T>>;
|
|
|
|
return PopCountImpl(static_cast<TCvt>(n));
|
|
}
|