64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
// Copyright 2022 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_CRC_INTERNAL_CPU_DETECT_H_
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#define ABSL_CRC_INTERNAL_CPU_DETECT_H_
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace crc_internal {
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// Enumeration of architectures that we have special-case tuning parameters for.
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// This set may change over time.
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enum class CpuType {
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kUnknown,
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kIntelHaswell,
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kAmdRome,
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kAmdNaples,
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kAmdMilan,
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kAmdGenoa,
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kAmdRyzenV3000,
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kIntelCascadelakeXeon,
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kIntelSkylakeXeon,
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kIntelBroadwell,
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kIntelSkylake,
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kIntelIvybridge,
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kIntelSandybridge,
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kIntelWestmere,
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kArmNeoverseN1,
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kArmNeoverseV1,
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kAmpereSiryn,
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kArmNeoverseN2,
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kArmNeoverseV2
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};
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// Returns the type of host CPU this code is running on. Returns kUnknown if
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// the host CPU is of unknown type, or if detection otherwise fails.
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CpuType GetCpuType();
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// Returns whether the host CPU supports the CPU features needed for our
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// accelerated implementations. The CpuTypes enumerated above apart from
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// kUnknown support the required features. On unknown CPUs, we can use
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// this to see if it's safe to use hardware acceleration, though without any
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// tuning.
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bool SupportsArmCRC32PMULL();
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} // namespace crc_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_CRC_INTERNAL_CPU_DETECT_H_
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