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#ifndef MARISA_GRIMOIRE_VECTOR_POP_COUNT_H_
#define MARISA_GRIMOIRE_VECTOR_POP_COUNT_H_
#include "marisa/grimoire/intrin.h"
namespace marisa {
namespace grimoire {
namespace vector {
#if MARISA_WORD_SIZE == 64
class PopCount {
public:
explicit PopCount(UInt64 x) : value_() {
x = (x & 0x5555555555555555ULL) + ((x & 0xAAAAAAAAAAAAAAAAULL) >> 1);
x = (x & 0x3333333333333333ULL) + ((x & 0xCCCCCCCCCCCCCCCCULL) >> 2);
x = (x & 0x0F0F0F0F0F0F0F0FULL) + ((x & 0xF0F0F0F0F0F0F0F0ULL) >> 4);
x *= 0x0101010101010101ULL;
value_ = x;
}
std::size_t lo8() const {
return (std::size_t)(value_ & 0xFFU);
}
std::size_t lo16() const {
return (std::size_t)((value_ >> 8) & 0xFFU);
}
std::size_t lo24() const {
return (std::size_t)((value_ >> 16) & 0xFFU);
}
std::size_t lo32() const {
return (std::size_t)((value_ >> 24) & 0xFFU);
}
std::size_t lo40() const {
return (std::size_t)((value_ >> 32) & 0xFFU);
}
std::size_t lo48() const {
return (std::size_t)((value_ >> 40) & 0xFFU);
}
std::size_t lo56() const {
return (std::size_t)((value_ >> 48) & 0xFFU);
}
std::size_t lo64() const {
return (std::size_t)((value_ >> 56) & 0xFFU);
}
static std::size_t count(UInt64 x) {
#if defined(MARISA_X64) && defined(MARISA_USE_POPCNT)
#ifdef _MSC_VER
return __popcnt64(x);
#else // _MSC_VER
return static_cast<std::size_t>(_mm_popcnt_u64(x));
#endif // _MSC_VER
#else // defined(MARISA_X64) && defined(MARISA_USE_POPCNT)
return PopCount(x).lo64();
#endif // defined(MARISA_X64) && defined(MARISA_USE_POPCNT)
}
private:
UInt64 value_;
};
#else // MARISA_WORD_SIZE == 64
class PopCount {
public:
explicit PopCount(UInt32 x) : value_() {
x = (x & 0x55555555U) + ((x & 0xAAAAAAAAU) >> 1);
x = (x & 0x33333333U) + ((x & 0xCCCCCCCCU) >> 2);
x = (x & 0x0F0F0F0FU) + ((x & 0xF0F0F0F0U) >> 4);
x *= 0x01010101U;
value_ = x;
}
std::size_t lo8() const {
return value_ & 0xFFU;
}
std::size_t lo16() const {
return (value_ >> 8) & 0xFFU;
}
std::size_t lo24() const {
return (value_ >> 16) & 0xFFU;
}
std::size_t lo32() const {
return (value_ >> 24) & 0xFFU;
}
static std::size_t count(UInt32 x) {
#ifdef MARISA_USE_POPCNT
#ifdef _MSC_VER
return __popcnt(x);
#else // _MSC_VER
return _mm_popcnt_u32(x);
#endif // _MSC_VER
#else // MARISA_USE_POPCNT
return PopCount(x).lo32();
#endif // MARISA_USE_POPCNT
}
private:
UInt32 value_;
};
#endif // MARISA_WORD_SIZE == 64
} // namespace vector
} // namespace grimoire
} // namespace marisa
#endif // MARISA_GRIMOIRE_VECTOR_POP_COUNT_H_