Ensure consistent result of transcendental functions.

src/platform-win32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Platform specific code for Win32.
 
 #define V8_WIN32_HEADERS_FULL
 #include "win32-headers.h"
 
 #include "v8.h"
 
+#include "codegen.h"
 #include "platform.h"
 #include "vm-state-inl.h"
 
 #ifdef _MSC_VER
 
 // Case-insensitive bounded string comparisons. Use stricmp() on Win32. Usually
 // defined in strings.h.
 int strncasecmp(const char* s1, const char* s2, int n) {
   return _strnicmp(s1, s2, n);
 }
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   // dividend is a zero and divisor is nonzero finite => result equals dividend
   if (!(isfinite(x) && (!isfinite(y) && !isnan(y))) &&
       !(x == 0 && (y != 0 && isfinite(y)))) {
     x = fmod(x, y);
   }
   return x;
 }
 
 #endif  // _WIN64
 
+
+static Mutex* transcendental_function_mutex = OS::CreateMutex();
+
+#define TRANSCENDENTAL_FUNCTION(name, type)                   \
+static TranscendentalFunction fast_##name##_function = NULL;  \
+double fast_##name(double x) {                                \
+  if (fast_##name##_function == NULL) {                       \
+    ScopedLock lock(transcendental_function_mutex);           \
+    TranscendentalFunction temp =                             \
+        CreateTranscendentalFunction(type);                   \
+    MemoryBarrier();                                          \
+    fast_##name##_function = temp;                            \
+  }                                                           \
+  return (*fast_##name##_function)(x);                        \
+}
+
+TRANSCENDENTAL_FUNCTION(sin, TranscendentalCache::SIN)
+TRANSCENDENTAL_FUNCTION(cos, TranscendentalCache::COS)
+TRANSCENDENTAL_FUNCTION(tan, TranscendentalCache::TAN)
+TRANSCENDENTAL_FUNCTION(log, TranscendentalCache::LOG)
+
+#undef TRANSCENDENTAL_FUNCTION
+
+
 // ----------------------------------------------------------------------------
 // The Time class represents time on win32. A timestamp is represented as
 // a 64-bit integer in 100 nanoseconds since January 1, 1601 (UTC). JavaScript
 // timestamps are represented as a doubles in milliseconds since 00:00:00 UTC,
 // January 1, 1970.
 
 class Time {
  public:
   // Constructors.
   Time();
@@ skipping 1855 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal