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