folly/folly/CpuId.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <cstdint>
#include <cstring>

#include <folly/Portability.h>

#ifdef _MSC_VER
#include <intrin.h>
#endif

namespace folly {

/**
 * Identification of an Intel CPU.
 * Supports CPUID feature flags (EAX=1) and extended features (EAX=7, ECX=0).
 * Values from
 * http://www.intel.com/content/www/us/en/processors/processor-identification-cpuid-instruction-note.html
 */
class CpuId { … };

} // namespace folly