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// Copyright 2022 The Abseil Authors
//
// 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
//
// https://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.
#ifndef ABSL_CRC_INTERNAL_CPU_DETECT_H_
#define ABSL_CRC_INTERNAL_CPU_DETECT_H_
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace crc_internal {
// Enumeration of architectures that we have special-case tuning parameters for.
// This set may change over time.
enum class CpuType {
kUnknown,
kIntelHaswell,
kAmdRome,
kAmdNaples,
kAmdMilan,
kIntelCascadelakeXeon,
kIntelSkylakeXeon,
kIntelBroadwell,
kIntelSkylake,
kIntelIvybridge,
kIntelSandybridge,
kIntelWestmere,
kArmNeoverseN1,
};
// Returns the type of host CPU this code is running on. Returns kUnknown if
// the host CPU is of unknown type, or if detection otherwise fails.
CpuType GetCpuType();
// Returns whether the host CPU supports the CPU features needed for our
// accelerated implementations. The CpuTypes enumerated above apart from
// kUnknown support the required features. On unknown CPUs, we can use
// this to see if it's safe to use hardware acceleration, though without any
// tuning.
bool SupportsArmCRC32PMULL();
} // namespace crc_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_CRC_INTERNAL_CPU_DETECT_H_
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