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_ 97
