1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_ 18 #define ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_ 19 20 #include "arch/instruction_set_features.h" 21 22 namespace art { 23 24 // Instruction set features relevant to the X86 architecture. 25 class X86InstructionSetFeatures : public InstructionSetFeatures { 26 public: 27 // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures. 28 static const X86InstructionSetFeatures* FromVariant(const std::string& variant, 29 std::string* error_msg, 30 bool x86_64 = false); 31 32 // Parse a bitmap and create an InstructionSetFeatures. 33 static const X86InstructionSetFeatures* FromBitmap(uint32_t bitmap, bool x86_64 = false); 34 35 // Turn C pre-processor #defines into the equivalent instruction set features. 36 static const X86InstructionSetFeatures* FromCppDefines(bool x86_64 = false); 37 38 // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 39 static const X86InstructionSetFeatures* FromCpuInfo(bool x86_64 = false); 40 41 // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 42 // InstructionSetFeatures. 43 static const X86InstructionSetFeatures* FromHwcap(bool x86_64 = false); 44 45 // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 46 // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 47 static const X86InstructionSetFeatures* FromAssembly(bool x86_64 = false); 48 49 bool Equals(const InstructionSetFeatures* other) const OVERRIDE; 50 GetInstructionSet()51 virtual InstructionSet GetInstructionSet() const OVERRIDE { 52 return kX86; 53 } 54 55 uint32_t AsBitmap() const OVERRIDE; 56 57 std::string GetFeatureString() const OVERRIDE; 58 ~X86InstructionSetFeatures()59 virtual ~X86InstructionSetFeatures() {} 60 HasSSE4_1()61 bool HasSSE4_1() const { return has_SSE4_1_; } 62 PrefersLockedAddSynchronization()63 bool PrefersLockedAddSynchronization() const { return prefers_locked_add_; } 64 HasPopCnt()65 bool HasPopCnt() const { return has_POPCNT_; } 66 67 protected: 68 // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures. 69 virtual const InstructionSetFeatures* AddFeaturesFromSplitString(const bool smp,const std::vector<std::string> & features,std::string * error_msg)70 AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features, 71 std::string* error_msg) const OVERRIDE { 72 return AddFeaturesFromSplitString(smp, features, false, error_msg); 73 } 74 75 const InstructionSetFeatures* 76 AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features, 77 bool x86_64, std::string* error_msg) const; 78 X86InstructionSetFeatures(bool smp,bool has_SSSE3,bool has_SSE4_1,bool has_SSE4_2,bool has_AVX,bool has_AVX2,bool prefers_locked_add,bool has_POPCNT)79 X86InstructionSetFeatures(bool smp, bool has_SSSE3, bool has_SSE4_1, bool has_SSE4_2, 80 bool has_AVX, bool has_AVX2, 81 bool prefers_locked_add, 82 bool has_POPCNT) 83 : InstructionSetFeatures(smp), 84 has_SSSE3_(has_SSSE3), 85 has_SSE4_1_(has_SSE4_1), 86 has_SSE4_2_(has_SSE4_2), 87 has_AVX_(has_AVX), 88 has_AVX2_(has_AVX2), 89 prefers_locked_add_(prefers_locked_add), 90 has_POPCNT_(has_POPCNT) { 91 } 92 93 private: 94 // Bitmap positions for encoding features as a bitmap. 95 enum { 96 kSmpBitfield = 1, 97 kSsse3Bitfield = 2, 98 kSse4_1Bitfield = 4, 99 kSse4_2Bitfield = 8, 100 kAvxBitfield = 16, 101 kAvx2Bitfield = 32, 102 kPrefersLockedAdd = 64, 103 kPopCntBitfield = 128, 104 }; 105 106 const bool has_SSSE3_; // x86 128bit SIMD - Supplemental SSE. 107 const bool has_SSE4_1_; // x86 128bit SIMD SSE4.1. 108 const bool has_SSE4_2_; // x86 128bit SIMD SSE4.2. 109 const bool has_AVX_; // x86 256bit SIMD AVX. 110 const bool has_AVX2_; // x86 256bit SIMD AVX 2.0. 111 const bool prefers_locked_add_; // x86 use locked add for memory synchronization. 112 const bool has_POPCNT_; // x86 population count 113 114 DISALLOW_COPY_AND_ASSIGN(X86InstructionSetFeatures); 115 }; 116 117 } // namespace art 118 119 #endif // ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_ 120