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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/cpu.h" | 5 #include "base/cpu.h" |
6 | 6 |
7 #include <string.h> | 7 #include <string.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
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25 stepping_(0), | 25 stepping_(0), |
26 ext_model_(0), | 26 ext_model_(0), |
27 ext_family_(0), | 27 ext_family_(0), |
28 has_mmx_(false), | 28 has_mmx_(false), |
29 has_sse_(false), | 29 has_sse_(false), |
30 has_sse2_(false), | 30 has_sse2_(false), |
31 has_sse3_(false), | 31 has_sse3_(false), |
32 has_ssse3_(false), | 32 has_ssse3_(false), |
33 has_sse41_(false), | 33 has_sse41_(false), |
34 has_sse42_(false), | 34 has_sse42_(false), |
35 has_nonstoptsc_(false), | |
35 cpu_vendor_("unknown") { | 36 cpu_vendor_("unknown") { |
36 Initialize(); | 37 Initialize(); |
37 } | 38 } |
38 | 39 |
39 #if defined(ARCH_CPU_X86_FAMILY) | 40 #if defined(ARCH_CPU_X86_FAMILY) |
40 #ifndef _MSC_VER | 41 #ifndef _MSC_VER |
41 | 42 |
42 #if defined(__pic__) && defined(__i386__) | 43 #if defined(__pic__) && defined(__i386__) |
43 | 44 |
44 void __cpuid(int cpu_info[4], int info_type) { | 45 void __cpuid(int cpu_info[4], int info_type) { |
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116 has_sse3_ = (cpu_info[2] & 0x00000001) != 0; | 117 has_sse3_ = (cpu_info[2] & 0x00000001) != 0; |
117 has_ssse3_ = (cpu_info[2] & 0x00000200) != 0; | 118 has_ssse3_ = (cpu_info[2] & 0x00000200) != 0; |
118 has_sse41_ = (cpu_info[2] & 0x00080000) != 0; | 119 has_sse41_ = (cpu_info[2] & 0x00080000) != 0; |
119 has_sse42_ = (cpu_info[2] & 0x00100000) != 0; | 120 has_sse42_ = (cpu_info[2] & 0x00100000) != 0; |
120 has_avx_ = (cpu_info[2] & 0x10000000) != 0; | 121 has_avx_ = (cpu_info[2] & 0x10000000) != 0; |
121 } | 122 } |
122 | 123 |
123 // Get the brand string of the cpu. | 124 // Get the brand string of the cpu. |
124 __cpuid(cpu_info, 0x80000000); | 125 __cpuid(cpu_info, 0x80000000); |
125 const int parameter_end = 0x80000004; | 126 const int parameter_end = 0x80000004; |
127 int max_parameter = cpu_info[0]; | |
126 | 128 |
127 if (cpu_info[0] >= parameter_end) { | 129 if (cpu_info[0] >= parameter_end) { |
128 char* cpu_string_ptr = cpu_string; | 130 char* cpu_string_ptr = cpu_string; |
129 | 131 |
130 for (int parameter = 0x80000002; parameter <= parameter_end && | 132 for (int parameter = 0x80000002; parameter <= parameter_end && |
131 cpu_string_ptr < &cpu_string[sizeof(cpu_string)]; parameter++) { | 133 cpu_string_ptr < &cpu_string[sizeof(cpu_string)]; parameter++) { |
132 __cpuid(cpu_info, parameter); | 134 __cpuid(cpu_info, parameter); |
133 memcpy(cpu_string_ptr, cpu_info, sizeof(cpu_info)); | 135 memcpy(cpu_string_ptr, cpu_info, sizeof(cpu_info)); |
134 cpu_string_ptr += sizeof(cpu_info); | 136 cpu_string_ptr += sizeof(cpu_info); |
135 } | 137 } |
136 cpu_brand_.assign(cpu_string, cpu_string_ptr - cpu_string); | 138 cpu_brand_.assign(cpu_string, cpu_string_ptr - cpu_string); |
137 } | 139 } |
140 | |
141 const int parameter_containing_nonstoptsc = 0x80000007; | |
142 if (max_parameter >= parameter_containing_nonstoptsc) { | |
143 __cpuid(cpu_info, parameter_containing_nonstoptsc); | |
144 has_nonstoptsc_ = (cpu_info[3] & (1 << 8)) != 0; | |
jar (doing other things)
2013/04/04 00:26:13
nit: unless there is a great reason to write this
James Simonsen
2013/04/04 02:26:51
Done.
| |
145 } | |
138 #endif | 146 #endif |
139 } | 147 } |
140 | 148 |
141 CPU::IntelMicroArchitecture CPU::GetIntelMicroArchitecture() const { | 149 CPU::IntelMicroArchitecture CPU::GetIntelMicroArchitecture() const { |
142 if (has_avx()) return AVX; | 150 if (has_avx()) return AVX; |
143 if (has_sse42()) return SSE42; | 151 if (has_sse42()) return SSE42; |
144 if (has_sse41()) return SSE41; | 152 if (has_sse41()) return SSE41; |
145 if (has_ssse3()) return SSSE3; | 153 if (has_ssse3()) return SSSE3; |
146 if (has_sse3()) return SSE3; | 154 if (has_sse3()) return SSE3; |
147 if (has_sse2()) return SSE2; | 155 if (has_sse2()) return SSE2; |
148 if (has_sse()) return SSE; | 156 if (has_sse()) return SSE; |
149 return PENTIUM; | 157 return PENTIUM; |
150 } | 158 } |
151 | 159 |
152 } // namespace base | 160 } // namespace base |
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