text: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_
  #define ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_
  
  #include <museum/7.1.2/art/runtime/arch/instruction_set_features.h>
  
  namespace facebook { namespace museum { namespace MUSEUM_VERSION { namespace art {
  
  // Instruction set features relevant to the X86 architecture.
  class X86InstructionSetFeatures : public InstructionSetFeatures {
   public:
    // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures.
    static const X86InstructionSetFeatures* FromVariant(const std::string& variant,
                                                          std::string* error_msg,
                                                          bool x86_64 = false);
  
    // Parse a bitmap and create an InstructionSetFeatures.
    static const X86InstructionSetFeatures* FromBitmap(uint32_t bitmap, bool x86_64 = false);
  
    // Turn C pre-processor #defines into the equivalent instruction set features.
    static const X86InstructionSetFeatures* FromCppDefines(bool x86_64 = false);
  
    // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
    static const X86InstructionSetFeatures* FromCpuInfo(bool x86_64 = false);
  
    // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
    // InstructionSetFeatures.
    static const X86InstructionSetFeatures* FromHwcap(bool x86_64 = false);
  
    // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
    // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
    static const X86InstructionSetFeatures* FromAssembly(bool x86_64 = false);
  
    bool Equals(const InstructionSetFeatures* other) const OVERRIDE;
  
    virtual InstructionSet GetInstructionSet() const OVERRIDE {
      return kX86;
    }
  
    uint32_t AsBitmap() const OVERRIDE;
  
    std::string GetFeatureString() const OVERRIDE;
  
    virtual ~X86InstructionSetFeatures() {}
  
    bool HasSSE4_1() const { return has_SSE4_1_; }
  
    bool PrefersLockedAddSynchronization() const { return prefers_locked_add_; }
  
    bool HasPopCnt() const { return has_POPCNT_; }
  
   protected:
    // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures.
    virtual const InstructionSetFeatures*
        AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features,
                                   std::string* error_msg) const OVERRIDE {
      return AddFeaturesFromSplitString(smp, features, false, error_msg);
    }
  
    const InstructionSetFeatures*
        AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features,
                                   bool x86_64, std::string* error_msg) const;
  
    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)
        : InstructionSetFeatures(smp),
          has_SSSE3_(has_SSSE3),
          has_SSE4_1_(has_SSE4_1),
          has_SSE4_2_(has_SSE4_2),
          has_AVX_(has_AVX),
          has_AVX2_(has_AVX2),
          prefers_locked_add_(prefers_locked_add),
          has_POPCNT_(has_POPCNT) {
    }
  
   private:
    // Bitmap positions for encoding features as a bitmap.
    enum {
      kSmpBitfield = 1,
      kSsse3Bitfield = 2,
      kSse4_1Bitfield = 4,
      kSse4_2Bitfield = 8,
      kAvxBitfield = 16,
      kAvx2Bitfield = 32,
      kPrefersLockedAdd = 64,
      kPopCntBitfield = 128,
    };
  
    const bool has_SSSE3_;   // x86 128bit SIMD - Supplemental SSE.
    const bool has_SSE4_1_;  // x86 128bit SIMD SSE4.1.
    const bool has_SSE4_2_;  // x86 128bit SIMD SSE4.2.
    const bool has_AVX_;     // x86 256bit SIMD AVX.
    const bool has_AVX2_;    // x86 256bit SIMD AVX 2.0.
    const bool prefers_locked_add_;  // x86 use locked add for memory synchronization.
    const bool has_POPCNT_;  // x86 population count
  
    DISALLOW_COPY_AND_ASSIGN(X86InstructionSetFeatures);
  };
  
  } } } } // namespace facebook::museum::MUSEUM_VERSION::art
  
  #endif  // ART_RUNTIME_ARCH_X86_INSTRUCTION_SET_FEATURES_X86_H_
  