Ensure consistency of Math.sqrt on Intel platforms.

src/platform-posix.cc

 // Copyright 2011 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 109 matching lines @@
 
 
 // ----------------------------------------------------------------------------
 // Math functions
 
 double modulo(double x, double y) {
   return fmod(x, y);
 }
 
 
-static Mutex* transcendental_function_mutex = OS::CreateMutex();
+static Mutex* math_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);                        \
+#define UNARY_MATH_FUNCTION(name, generator)             \
+static UnaryMathFunction fast_##name##_function = NULL;  \
+double fast_##name(double x) {                           \
+  if (fast_##name##_function == NULL) {                  \
+    ScopedLock lock(math_function_mutex);                \
+    UnaryMathFunction temp = generator;                  \
+    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)
+UNARY_MATH_FUNCTION(sin, CreateTranscendentalFunction(TranscendentalCache::SIN))
+UNARY_MATH_FUNCTION(cos, CreateTranscendentalFunction(TranscendentalCache::COS))
+UNARY_MATH_FUNCTION(tan, CreateTranscendentalFunction(TranscendentalCache::TAN))
+UNARY_MATH_FUNCTION(log, CreateTranscendentalFunction(TranscendentalCache::LOG))
+UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction())
 
-#undef TRANSCENDENTAL_FUNCTION
+#undef MATH_FUNCTION
 
 
 double OS::nan_value() {
   // NAN from math.h is defined in C99 and not in POSIX.
   return NAN;
 }
 
 
 // ----------------------------------------------------------------------------
 // POSIX date/time support.
@@ skipping 354 matching lines @@
   return ntohl(value);
 }
 
 
 Socket* OS::CreateSocket() {
   return new POSIXSocket();
 }
 
 
 } }  // namespace v8::internal