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// 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_SSE42_CHECK_H_
#define CRC32C_CRC32C_SSE42_CHECK_H_
// X86-specific code checking the availability of SSE4.2 instructions.
#include <cstddef>
#include <cstdint>
#ifdef CRC32C_HAVE_CONFIG_H
#include "crc32c/crc32c_config.h"
#endif
#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__))
// If the compiler supports SSE4.2, it definitely supports X86.
#if defined(_MSC_VER)
#include <intrin.h>
namespace crc32c {
inline bool CanUseSse42() {
int cpu_info[4];
__cpuid(cpu_info, 1);
return (cpu_info[2] & (1 << 20)) != 0;
}
} // namespace crc32c
#else // !defined(_MSC_VER)
#include <cpuid.h>
namespace crc32c {
inline bool CanUseSse42() {
unsigned int eax, ebx, ecx, edx;
return __get_cpuid(1, &eax, &ebx, &ecx, &edx) && ((ecx & (1 << 20)) != 0);
}
} // namespace crc32c
#endif // defined(_MSC_VER)
#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__))
#endif // CRC32C_CRC32C_SSE42_CHECK_H_
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