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 #include "base/macros.h" 22 23 #define GET_REX_R 0x04 24 #define GET_REX_X 0x02 25 #define GET_REX_B 0x01 26 #define SET_VEX_R 0x80 27 #define SET_VEX_X 0x40 28 #define SET_VEX_B 0x20 29 #define SET_VEX_M_0F 0x01 30 #define SET_VEX_M_0F_38 0x02 31 #define SET_VEX_M_0F_3A 0x03 32 #define SET_VEX_W 0x80 33 #define SET_VEX_L_128 0x00 34 #define SET_VEL_L_256 0x04 35 #define SET_VEX_PP_NONE 0x00 36 #define SET_VEX_PP_66 0x01 37 #define SET_VEX_PP_F3 0x02 38 #define SET_VEX_PP_F2 0x03 39 #define TWO_BYTE_VEX 0xC5 40 #define THREE_BYTE_VEX 0xC4 41 #define VEX_INIT 0x00 42 43 namespace art HIDDEN { 44 45 class X86InstructionSetFeatures; 46 using X86FeaturesUniquePtr = std::unique_ptr<const X86InstructionSetFeatures>; 47 48 // Instruction set features relevant to the X86 architecture. 49 class X86InstructionSetFeatures : public InstructionSetFeatures { 50 public: 51 // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures. 52 static X86FeaturesUniquePtr FromVariant(const std::string& variant, 53 std::string* error_msg, 54 bool x86_64 = false); 55 56 // Parse a bitmap and create an InstructionSetFeatures. 57 static X86FeaturesUniquePtr FromBitmap(uint32_t bitmap, bool x86_64 = false); 58 59 // Turn C pre-processor #defines into the equivalent instruction set features. 60 static X86FeaturesUniquePtr FromCppDefines(bool x86_64 = false); 61 62 // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 63 static X86FeaturesUniquePtr FromCpuInfo(bool x86_64 = false); 64 65 // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 66 // InstructionSetFeatures. 67 static X86FeaturesUniquePtr FromHwcap(bool x86_64 = false); 68 69 // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 70 // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 71 static X86FeaturesUniquePtr FromAssembly(bool x86_64 = false); 72 73 // Use external cpu_features library. 74 static X86FeaturesUniquePtr FromCpuFeatures(bool x86_64 = false); 75 76 bool Equals(const InstructionSetFeatures* other) const override; 77 78 bool HasAtLeast(const InstructionSetFeatures* other) const override; 79 GetInstructionSet()80 InstructionSet GetInstructionSet() const override { 81 return InstructionSet::kX86; 82 } 83 84 uint32_t AsBitmap() const override; 85 86 std::string GetFeatureString() const override; 87 ~X86InstructionSetFeatures()88 virtual ~X86InstructionSetFeatures() {} 89 HasSSE4_1()90 bool HasSSE4_1() const { return has_SSE4_1_; } 91 HasPopCnt()92 bool HasPopCnt() const { return has_POPCNT_; } 93 HasAVX2()94 bool HasAVX2() const { return has_AVX2_; } 95 HasAVX()96 bool HasAVX() const { return has_AVX_; } 97 98 protected: 99 // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures. 100 std::unique_ptr<const InstructionSetFeatures> AddFeaturesFromSplitString(const std::vector<std::string> & features,std::string * error_msg)101 AddFeaturesFromSplitString(const std::vector<std::string>& features, 102 std::string* error_msg) const override { 103 return AddFeaturesFromSplitString(features, false, error_msg); 104 } 105 106 std::unique_ptr<const InstructionSetFeatures> 107 AddFeaturesFromSplitString(const std::vector<std::string>& features, 108 bool x86_64, 109 std::string* error_msg) const; 110 X86InstructionSetFeatures(bool has_SSSE3,bool has_SSE4_1,bool has_SSE4_2,bool has_AVX,bool has_AVX2,bool has_POPCNT)111 X86InstructionSetFeatures(bool has_SSSE3, 112 bool has_SSE4_1, 113 bool has_SSE4_2, 114 bool has_AVX, 115 bool has_AVX2, 116 bool has_POPCNT) 117 : InstructionSetFeatures(), 118 has_SSSE3_(has_SSSE3), 119 has_SSE4_1_(has_SSE4_1), 120 has_SSE4_2_(has_SSE4_2), 121 has_AVX_(has_AVX), 122 has_AVX2_(has_AVX2), 123 has_POPCNT_(has_POPCNT) { 124 } 125 126 static X86FeaturesUniquePtr Create(bool x86_64, 127 bool has_SSSE3, 128 bool has_SSE4_1, 129 bool has_SSE4_2, 130 bool has_AVX, 131 bool has_AVX2, 132 bool has_POPCNT); 133 134 private: 135 // Bitmap positions for encoding features as a bitmap. 136 enum { 137 kSsse3Bitfield = 1 << 0, 138 kSse4_1Bitfield = 1 << 1, 139 kSse4_2Bitfield = 1 << 2, 140 kAvxBitfield = 1 << 3, 141 kAvx2Bitfield = 1 << 4, 142 kPopCntBitfield = 1 << 5, 143 }; 144 145 const bool has_SSSE3_; // x86 128bit SIMD - Supplemental SSE. 146 const bool has_SSE4_1_; // x86 128bit SIMD SSE4.1. 147 const bool has_SSE4_2_; // x86 128bit SIMD SSE4.2. 148 const bool has_AVX_; // x86 256bit SIMD AVX. 149 const bool has_AVX2_; // x86 256bit SIMD AVX 2.0. 150 const bool has_POPCNT_; // x86 population count 151 152 DISALLOW_COPY_AND_ASSIGN(X86InstructionSetFeatures); 153 }; 154 155 } // namespace art 156 157 #endif // ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_ 158