cpu_detect.h (1858B)
1 // Copyright 2022 The Abseil Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef ABSL_CRC_INTERNAL_CPU_DETECT_H_ 16 #define ABSL_CRC_INTERNAL_CPU_DETECT_H_ 17 18 #include "absl/base/config.h" 19 20 namespace absl { 21 ABSL_NAMESPACE_BEGIN 22 namespace crc_internal { 23 24 // Enumeration of architectures that we have special-case tuning parameters for. 25 // This set may change over time. 26 enum class CpuType { 27 kUnknown, 28 kIntelHaswell, 29 kAmdRome, 30 kAmdNaples, 31 kAmdMilan, 32 kAmdGenoa, 33 kAmdRyzenV3000, 34 kIntelCascadelakeXeon, 35 kIntelSkylakeXeon, 36 kIntelBroadwell, 37 kIntelSkylake, 38 kIntelIvybridge, 39 kIntelSandybridge, 40 kIntelWestmere, 41 kArmNeoverseN1, 42 kArmNeoverseV1, 43 kAmpereSiryn, 44 kArmNeoverseN2, 45 kArmNeoverseV2 46 }; 47 48 // Returns the type of host CPU this code is running on. Returns kUnknown if 49 // the host CPU is of unknown type, or if detection otherwise fails. 50 CpuType GetCpuType(); 51 52 // Returns whether the host CPU supports the CPU features needed for our 53 // accelerated implementations. The CpuTypes enumerated above apart from 54 // kUnknown support the required features. On unknown CPUs, we can use 55 // this to see if it's safe to use hardware acceleration, though without any 56 // tuning. 57 bool SupportsArmCRC32PMULL(); 58 59 } // namespace crc_internal 60 ABSL_NAMESPACE_END 61 } // namespace absl 62 63 #endif // ABSL_CRC_INTERNAL_CPU_DETECT_H_