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55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
#pragma once
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#include <stdint.h>
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#include <cstddef>
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#include <type_traits>
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using std::size_t;
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#include "bitops.h"
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#if defined(_MSC_VER)
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#include <intrin.h>
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#endif
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static inline uint32_t PopCountImpl(uint8_t n) {
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extern uint8_t const* PopCountLUT8;
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return PopCountLUT8[n];
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}
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static inline uint32_t PopCountImpl(uint16_t n) {
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#if defined(_MSC_VER)
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return __popcnt16(n);
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#else
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extern uint8_t const* PopCountLUT16;
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return PopCountLUT16[n];
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#endif
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}
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static inline uint32_t PopCountImpl(uint32_t n) {
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#if defined(_MSC_VER)
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return __popcnt(n);
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#elif defined(__GNUC__) // it is true for Clang also
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return __builtin_popcount(n);
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#else
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return PopCountImpl((uint16_t)LO_16(n)) + PopCountImpl((uint16_t)HI_16(n));
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#endif
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}
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static inline uint32_t PopCountImpl(uint64_t n) {
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#if defined(_MSC_VER) && !defined(_i386_)
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return __popcnt64(n);
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#elif defined(__GNUC__) // it is true for Clang also
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return __builtin_popcountll(n);
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#else
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return PopCountImpl((uint32_t)LO_32(n)) + PopCountImpl((uint32_t)HI_32(n));
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#endif
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}
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template <class T>
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static inline uint32_t PopCount(T n) {
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using TCvt = std::make_unsigned_t<std::decay_t<T>>;
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return PopCountImpl(static_cast<TCvt>(n));
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}
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