base/cpu.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef BASE_CPU_H_
   6 #define BASE_CPU_H_
   7
   8 #include <string>
   9
  10 #include "base/base_export.h"
  11
  12 namespace base {
  13
  14 // Query information about the processor.
  15 class BASE_EXPORT CPU {
  16  public:
  17   // Constructor
  18   CPU();
  19
  20   enum IntelMicroArchitecture {
  21     PENTIUM,
  22     SSE,
  23     SSE2,
  24     SSE3,
  25     SSSE3,
  26     SSE41,
  27     SSE42,
  28     AVX,
  29     MAX_INTEL_MICRO_ARCHITECTURE
  30   };
  31
  32   // Accessors for CPU information.
  33   const std::string& vendor_name() const { return cpu_vendor_; }
  34   int signature() const { return signature_; }
  35   int stepping() const { return stepping_; }
  36   int model() const { return model_; }
  37   int family() const { return family_; }
  38   int type() const { return type_; }
  39   int extended_model() const { return ext_model_; }
  40   int extended_family() const { return ext_family_; }
  41   bool has_mmx() const { return has_mmx_; }
  42   bool has_sse() const { return has_sse_; }
  43   bool has_sse2() const { return has_sse2_; }
  44   bool has_sse3() const { return has_sse3_; }
  45   bool has_ssse3() const { return has_ssse3_; }
  46   bool has_sse41() const { return has_sse41_; }
  47   bool has_sse42() const { return has_sse42_; }
  48   bool has_avx() const { return has_avx_; }
  49   // has_avx_hardware returns true when AVX is present in the CPU. This might
  50   // differ from the value of |has_avx()| because |has_avx()| also tests for
  51   // operating system support needed to actually call AVX instuctions.
  52   // Note: you should never need to call this function. It was added in order
  53   // to workaround a bug in NSS but |has_avx()| is what you want.
  54   bool has_avx_hardware() const { return has_avx_hardware_; }
  55   bool has_aesni() const { return has_aesni_; }
  56   bool has_non_stop_time_stamp_counter() const {
  57     return has_non_stop_time_stamp_counter_;
  58   }
  59   // has_broken_neon is only valid on ARM chips. If true, it indicates that we
  60   // believe that the NEON unit on the current CPU is flawed and cannot execute
  61   // some code. See https://code.google.com/p/chromium/issues/detail?id=341598
  62   bool has_broken_neon() const { return has_broken_neon_; }
  63
  64   IntelMicroArchitecture GetIntelMicroArchitecture() const;
  65   const std::string& cpu_brand() const { return cpu_brand_; }
  66
  67  private:
  68   // Query the processor for CPUID information.
  69   void Initialize();
  70
  71   int signature_;  // raw form of type, family, model, and stepping
  72   int type_;  // process type
  73   int family_;  // family of the processor
  74   int model_;  // model of processor
  75   int stepping_;  // processor revision number
  76   int ext_model_;
  77   int ext_family_;
  78   bool has_mmx_;
  79   bool has_sse_;
  80   bool has_sse2_;
  81   bool has_sse3_;
  82   bool has_ssse3_;
  83   bool has_sse41_;
  84   bool has_sse42_;
  85   bool has_avx_;
  86   bool has_avx_hardware_;
  87   bool has_aesni_;
  88   bool has_non_stop_time_stamp_counter_;
  89   bool has_broken_neon_;
  90   std::string cpu_vendor_;
  91   std::string cpu_brand_;
  92 };
  93
  94 }  // namespace base
  95
  96 #endif  // BASE_CPU_H_