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