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102 lines
2.1 KiB
C++
102 lines
2.1 KiB
C++
#pragma once
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#include <stdint.h>
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#include "succinct_config.hpp"
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#if SUCCINCT_USE_INTRINSICS
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#include <xmmintrin.h>
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#if defined(__GNUC__) || defined(__clang__)
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# define __INTRIN_INLINE inline __attribute__((__always_inline__))
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#elif defined(_MSC_VER)
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# define __INTRIN_INLINE inline __forceinline
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#else
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# define __INTRIN_INLINE inline
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#endif
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#endif
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#if SUCCINCT_USE_POPCNT
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# if !SUCCINCT_USE_INTRINSICS
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# error "Intrinsics support needed for popcnt"
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# endif
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#include <smmintrin.h>
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#endif
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namespace succinct { namespace intrinsics {
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#if SUCCINCT_USE_INTRINSICS
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__INTRIN_INLINE uint64_t byteswap64(uint64_t value)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_bswap64(value);
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#elif defined(_MSC_VER)
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return _byteswap_uint64(value);
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#else
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# error Unsupported platform
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#endif
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}
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__INTRIN_INLINE bool bsf64(unsigned long* const index, const uint64_t mask)
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{
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#if defined(__GNUC__) || defined(__clang__)
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if (mask) {
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*index = (unsigned long)__builtin_ctzll(mask);
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return true;
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} else {
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return false;
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}
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#elif defined(_MSC_VER)
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return _BitScanForward64(index, mask) != 0;
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#else
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# error Unsupported platform
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#endif
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}
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__INTRIN_INLINE bool bsr64(unsigned long* const index, const uint64_t mask)
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{
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#if defined(__GNUC__) || defined(__clang__)
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if (mask) {
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*index = (unsigned long)(63 - __builtin_clzll(mask));
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return true;
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} else {
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return false;
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}
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#elif defined(_MSC_VER)
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return _BitScanReverse64(index, mask) != 0;
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#else
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# error Unsupported platform
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#endif
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}
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template <typename T>
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__INTRIN_INLINE void prefetch(T const* ptr)
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{
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_mm_prefetch((const char*)ptr, _MM_HINT_T0);
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}
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#else /* SUCCINCT_USE_INTRINSICS */
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template <typename T>
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inline void prefetch(T const* /* ptr */)
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{
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/* do nothing */
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}
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#endif /* SUCCINCT_USE_INTRINSICS */
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#if SUCCINCT_USE_POPCNT
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__INTRIN_INLINE uint64_t popcount(uint64_t x)
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{
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return uint64_t(_mm_popcnt_u64(x));
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}
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#endif /* SUCCINCT_USE_POPCNT */
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}}
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