git / moonbite-core / src/crc32c/src/crc32c_prefetch.h · raw

// Copyright 2017 The CRC32C Authors. All rights reserved.// Use of this source code is governed by a BSD-style license that can be// found in the LICENSE file. See the AUTHORS file for names of contributors.#ifndef CRC32C_CRC32C_PREFETCH_H_#define CRC32C_CRC32C_PREFETCH_H_#include <cstddef>#include <cstdint>#ifdef CRC32C_HAVE_CONFIG_H#include "crc32c/crc32c_config.h"#endif#if HAVE_MM_PREFETCH#if defined(_MSC_VER)#include <intrin.h>#else  // !defined(_MSC_VER)#include <xmmintrin.h>#endif  // defined(_MSC_VER)#endif  // HAVE_MM_PREFETCHnamespace crc32c {// Ask the hardware to prefetch the data at the given address into the L1 cache.inline void RequestPrefetch(const uint8_t* address) {#if HAVE_BUILTIN_PREFETCH  // Clang and GCC implement the __builtin_prefetch non-standard extension,  // which maps to the best instruction on the target architecture.  __builtin_prefetch(reinterpret_cast<const char*>(address), 0 /* Read only. */,                     0 /* No temporal locality. */);#elif HAVE_MM_PREFETCH  // Visual Studio doesn't implement __builtin_prefetch, but exposes the  // PREFETCHNTA instruction via the _mm_prefetch intrinsic.  _mm_prefetch(reinterpret_cast<const char*>(address), _MM_HINT_NTA);#else  // No prefetch support. Silence compiler warnings.  (void)address;#endif  // HAVE_BUILTIN_PREFETCH}}  // namespace crc32c#endif  // CRC32C_CRC32C_ROUND_UP_H_