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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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120 | 120 |
121 | 121 |
122 // ---------------------------------------------------------------------------- | 122 // ---------------------------------------------------------------------------- |
123 // Math functions | 123 // Math functions |
124 | 124 |
125 double modulo(double x, double y) { | 125 double modulo(double x, double y) { |
126 return fmod(x, y); | 126 return fmod(x, y); |
127 } | 127 } |
128 | 128 |
129 | 129 |
| 130 static Mutex* math_function_mutex = OS::CreateMutex(); |
| 131 |
130 #define UNARY_MATH_FUNCTION(name, generator) \ | 132 #define UNARY_MATH_FUNCTION(name, generator) \ |
131 static UnaryMathFunction fast_##name##_function = NULL; \ | 133 static UnaryMathFunction fast_##name##_function = NULL; \ |
132 V8_DECLARE_ONCE(fast_##name##_init_once); \ | |
133 void init_fast_##name##_function() { \ | |
134 fast_##name##_function = generator; \ | |
135 } \ | |
136 double fast_##name(double x) { \ | 134 double fast_##name(double x) { \ |
137 CallOnce(&fast_##name##_init_once, \ | 135 if (fast_##name##_function == NULL) { \ |
138 &init_fast_##name##_function); \ | 136 ScopedLock lock(math_function_mutex); \ |
| 137 UnaryMathFunction temp = generator; \ |
| 138 MemoryBarrier(); \ |
| 139 fast_##name##_function = temp; \ |
| 140 } \ |
139 return (*fast_##name##_function)(x); \ | 141 return (*fast_##name##_function)(x); \ |
140 } | 142 } |
141 | 143 |
142 UNARY_MATH_FUNCTION(sin, CreateTranscendentalFunction(TranscendentalCache::SIN)) | 144 UNARY_MATH_FUNCTION(sin, CreateTranscendentalFunction(TranscendentalCache::SIN)) |
143 UNARY_MATH_FUNCTION(cos, CreateTranscendentalFunction(TranscendentalCache::COS)) | 145 UNARY_MATH_FUNCTION(cos, CreateTranscendentalFunction(TranscendentalCache::COS)) |
144 UNARY_MATH_FUNCTION(tan, CreateTranscendentalFunction(TranscendentalCache::TAN)) | 146 UNARY_MATH_FUNCTION(tan, CreateTranscendentalFunction(TranscendentalCache::TAN)) |
145 UNARY_MATH_FUNCTION(log, CreateTranscendentalFunction(TranscendentalCache::LOG)) | 147 UNARY_MATH_FUNCTION(log, CreateTranscendentalFunction(TranscendentalCache::LOG)) |
146 UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction()) | 148 UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction()) |
147 | 149 |
148 #undef MATH_FUNCTION | 150 #undef MATH_FUNCTION |
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298 str[str.length() - 1] = '\0'; | 300 str[str.length() - 1] = '\0'; |
299 return -1; | 301 return -1; |
300 } else { | 302 } else { |
301 return n; | 303 return n; |
302 } | 304 } |
303 } | 305 } |
304 | 306 |
305 | 307 |
306 #if defined(V8_TARGET_ARCH_IA32) | 308 #if defined(V8_TARGET_ARCH_IA32) |
307 static OS::MemCopyFunction memcopy_function = NULL; | 309 static OS::MemCopyFunction memcopy_function = NULL; |
308 static LazyMutex memcopy_function_mutex = LAZY_MUTEX_INITIALIZER; | 310 static Mutex* memcopy_function_mutex = OS::CreateMutex(); |
309 // Defined in codegen-ia32.cc. | 311 // Defined in codegen-ia32.cc. |
310 OS::MemCopyFunction CreateMemCopyFunction(); | 312 OS::MemCopyFunction CreateMemCopyFunction(); |
311 | 313 |
312 // Copy memory area to disjoint memory area. | 314 // Copy memory area to disjoint memory area. |
313 void OS::MemCopy(void* dest, const void* src, size_t size) { | 315 void OS::MemCopy(void* dest, const void* src, size_t size) { |
314 if (memcopy_function == NULL) { | 316 if (memcopy_function == NULL) { |
315 ScopedLock lock(memcopy_function_mutex.Pointer()); | 317 ScopedLock lock(memcopy_function_mutex); |
316 if (memcopy_function == NULL) { | 318 if (memcopy_function == NULL) { |
317 OS::MemCopyFunction temp = CreateMemCopyFunction(); | 319 OS::MemCopyFunction temp = CreateMemCopyFunction(); |
318 MemoryBarrier(); | 320 MemoryBarrier(); |
319 memcopy_function = temp; | 321 memcopy_function = temp; |
320 } | 322 } |
321 } | 323 } |
322 // Note: here we rely on dependent reads being ordered. This is true | 324 // Note: here we rely on dependent reads being ordered. This is true |
323 // on all architectures we currently support. | 325 // on all architectures we currently support. |
324 (*memcopy_function)(dest, src, size); | 326 (*memcopy_function)(dest, src, size); |
325 #ifdef DEBUG | 327 #ifdef DEBUG |
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513 return ntohl(value); | 515 return ntohl(value); |
514 } | 516 } |
515 | 517 |
516 | 518 |
517 Socket* OS::CreateSocket() { | 519 Socket* OS::CreateSocket() { |
518 return new POSIXSocket(); | 520 return new POSIXSocket(); |
519 } | 521 } |
520 | 522 |
521 | 523 |
522 } } // namespace v8::internal | 524 } } // namespace v8::internal |
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