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      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 class X86InstructionSetFeatures;
     25 using X86FeaturesUniquePtr = std::unique_ptr<const X86InstructionSetFeatures>;
     26 
     27 // Instruction set features relevant to the X86 architecture.
     28 class X86InstructionSetFeatures : public InstructionSetFeatures {
     29  public:
     30   // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures.
     31   static X86FeaturesUniquePtr FromVariant(const std::string& variant,
     32                                           std::string* error_msg,
     33                                           bool x86_64 = false);
     34 
     35   // Parse a bitmap and create an InstructionSetFeatures.
     36   static X86FeaturesUniquePtr FromBitmap(uint32_t bitmap, bool x86_64 = false);
     37 
     38   // Turn C pre-processor #defines into the equivalent instruction set features.
     39   static X86FeaturesUniquePtr FromCppDefines(bool x86_64 = false);
     40 
     41   // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
     42   static X86FeaturesUniquePtr FromCpuInfo(bool x86_64 = false);
     43 
     44   // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
     45   // InstructionSetFeatures.
     46   static X86FeaturesUniquePtr FromHwcap(bool x86_64 = false);
     47 
     48   // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
     49   // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
     50   static X86FeaturesUniquePtr FromAssembly(bool x86_64 = false);
     51 
     52   bool Equals(const InstructionSetFeatures* other) const OVERRIDE;
     53 
     54   bool HasAtLeast(const InstructionSetFeatures* other) const OVERRIDE;
     55 
     56   virtual InstructionSet GetInstructionSet() const OVERRIDE {
     57     return InstructionSet::kX86;
     58   }
     59 
     60   uint32_t AsBitmap() const OVERRIDE;
     61 
     62   std::string GetFeatureString() const OVERRIDE;
     63 
     64   virtual ~X86InstructionSetFeatures() {}
     65 
     66   bool HasSSE4_1() const { return has_SSE4_1_; }
     67 
     68   bool HasPopCnt() const { return has_POPCNT_; }
     69 
     70  protected:
     71   // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures.
     72   virtual std::unique_ptr<const InstructionSetFeatures>
     73       AddFeaturesFromSplitString(const std::vector<std::string>& features,
     74                                  std::string* error_msg) const OVERRIDE {
     75     return AddFeaturesFromSplitString(features, false, error_msg);
     76   }
     77 
     78   std::unique_ptr<const InstructionSetFeatures>
     79       AddFeaturesFromSplitString(const std::vector<std::string>& features,
     80                                  bool x86_64,
     81                                  std::string* error_msg) const;
     82 
     83   X86InstructionSetFeatures(bool has_SSSE3,
     84                             bool has_SSE4_1,
     85                             bool has_SSE4_2,
     86                             bool has_AVX,
     87                             bool has_AVX2,
     88                             bool has_POPCNT)
     89       : InstructionSetFeatures(),
     90         has_SSSE3_(has_SSSE3),
     91         has_SSE4_1_(has_SSE4_1),
     92         has_SSE4_2_(has_SSE4_2),
     93         has_AVX_(has_AVX),
     94         has_AVX2_(has_AVX2),
     95         has_POPCNT_(has_POPCNT) {
     96   }
     97 
     98   static X86FeaturesUniquePtr Create(bool x86_64,
     99                                      bool has_SSSE3,
    100                                      bool has_SSE4_1,
    101                                      bool has_SSE4_2,
    102                                      bool has_AVX,
    103                                      bool has_AVX2,
    104                                      bool has_POPCNT);
    105 
    106  private:
    107   // Bitmap positions for encoding features as a bitmap.
    108   enum {
    109     kSsse3Bitfield = 1 << 0,
    110     kSse4_1Bitfield = 1 << 1,
    111     kSse4_2Bitfield = 1 << 2,
    112     kAvxBitfield = 1 << 3,
    113     kAvx2Bitfield = 1 << 4,
    114     kPopCntBitfield = 1 << 5,
    115   };
    116 
    117   const bool has_SSSE3_;   // x86 128bit SIMD - Supplemental SSE.
    118   const bool has_SSE4_1_;  // x86 128bit SIMD SSE4.1.
    119   const bool has_SSE4_2_;  // x86 128bit SIMD SSE4.2.
    120   const bool has_AVX_;     // x86 256bit SIMD AVX.
    121   const bool has_AVX2_;    // x86 256bit SIMD AVX 2.0.
    122   const bool has_POPCNT_;  // x86 population count
    123 
    124   DISALLOW_COPY_AND_ASSIGN(X86InstructionSetFeatures);
    125 };
    126 
    127 }  // namespace art
    128 
    129 #endif  // ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_
    130