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Issue 569015: ARMv7 ubfx support from Kun Zhang (zhangk@codeaurora.org), Code Aurora (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 10 years, 10 months ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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82 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); 82 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
83 srandom(static_cast<unsigned int>(seed)); 83 srandom(static_cast<unsigned int>(seed));
84 } 84 }
85 85
86 86
87 uint64_t OS::CpuFeaturesImpliedByPlatform() { 87 uint64_t OS::CpuFeaturesImpliedByPlatform() {
88 #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) 88 #if (defined(__VFP_FP__) && !defined(__SOFTFP__))
89 // Here gcc is telling us that we are on an ARM and gcc is assuming that we 89 // Here gcc is telling us that we are on an ARM and gcc is assuming that we
90 // have VFP3 instructions. If gcc can assume it then so can we. 90 // have VFP3 instructions. If gcc can assume it then so can we.
91 return 1u << VFP3; 91 return 1u << VFP3;
92 #elif CAN_USE_ARMV7_INSTRUCTIONS
93 return 1u << ARMv7;
92 #else 94 #else
93 return 0; // Linux runs on anything. 95 return 0; // Linux runs on anything.
94 #endif 96 #endif
95 } 97 }
96 98
97 99
98 #ifdef __arm__ 100 #ifdef __arm__
99 bool OS::ArmCpuHasFeature(CpuFeature feature) { 101 bool OS::ArmCpuHasFeature(CpuFeature feature) {
100 const char* search_string = NULL; 102 const char* search_string = NULL;
101 const char* file_name = "/proc/cpuinfo"; 103 const char* file_name = "/proc/cpuinfo";
102 // Simple detection of VFP at runtime for Linux. 104 // Simple detection of VFP at runtime for Linux.
103 // It is based on /proc/cpuinfo, which reveals hardware configuration 105 // It is based on /proc/cpuinfo, which reveals hardware configuration
104 // to user-space applications. According to ARM (mid 2009), no similar 106 // to user-space applications. According to ARM (mid 2009), no similar
105 // facility is universally available on the ARM architectures, 107 // facility is universally available on the ARM architectures,
106 // so it's up to individual OSes to provide such. 108 // so it's up to individual OSes to provide such.
107 // 109 //
108 // This is written as a straight shot one pass parser 110 // This is written as a straight shot one pass parser
109 // and not using STL string and ifstream because, 111 // and not using STL string and ifstream because,
110 // on Linux, it's reading from a (non-mmap-able) 112 // on Linux, it's reading from a (non-mmap-able)
111 // character special device. 113 // character special device.
112 switch (feature) { 114 switch (feature) {
113 case VFP3: 115 case VFP3:
114 search_string = "vfp"; 116 search_string = "vfp";
115 break; 117 break;
118 case ARMv7:
119 search_string = "ARMv7";
120 break;
116 default: 121 default:
117 UNREACHABLE(); 122 UNREACHABLE();
118 } 123 }
119 124
120 FILE* f = NULL; 125 FILE* f = NULL;
121 const char* what = search_string; 126 const char* what = search_string;
122 127
123 if (NULL == (f = fopen(file_name, "r"))) 128 if (NULL == (f = fopen(file_name, "r")))
124 return false; 129 return false;
125 130
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817 822
818 // This sampler is no longer the active sampler. 823 // This sampler is no longer the active sampler.
819 active_sampler_ = NULL; 824 active_sampler_ = NULL;
820 active_ = false; 825 active_ = false;
821 } 826 }
822 827
823 828
824 #endif // ENABLE_LOGGING_AND_PROFILING 829 #endif // ENABLE_LOGGING_AND_PROFILING
825 830
826 } } // namespace v8::internal 831 } } // namespace v8::internal
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