Fix failing test caused by extra precision in register allocated fp values.

src/checks.h

 // Copyright 2006-2008 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 146 matching lines @@
 
 
 // Helper function used by the CHECK function when given floating
 // point arguments.  Should not be called directly.
 static inline void CheckEqualsHelper(const char* file,
                                      int line,
                                      const char* expected_source,
                                      double expected,
                                      const char* value_source,
                                      double value) {
-  if (expected != value) {
+  // Force values to 64 bit memory to truncate 80 bit precision on IA32.
+  volatile double* exp = new double[1];
+  *exp = expected;
+  volatile double* val = new double[1];
+  *val = value;

[Feng Qian, 2008/09/26 23:13:01]

ugly (not your fault). LGTM.

+  if (*exp != *val) {
     V8_Fatal(file, line,
              "CHECK_EQ(%s, %s) failed\n#   Expected: %f\n#   Found: %f",
-             expected_source, value_source, expected, value);
+             expected_source, value_source, *exp, *val);
   }
+  delete[] exp;
+  delete[] val;
 }
 
 
 namespace v8 {
   class Value;
   template <class T> class Handle;
 }
 
 
 void CheckNonEqualsHelper(const char* file,
@@ skipping 61 matching lines @@
 #define SLOW_ASSERT(condition) ((void) 0)
 #endif
 
 
 #define ASSERT_TAG_ALIGNED(address) \
   ASSERT((reinterpret_cast<int>(address) & kHeapObjectTagMask) == 0)
 
 #define ASSERT_SIZE_TAG_ALIGNED(size) ASSERT((size & kHeapObjectTagMask) == 0)
 
 #endif  // V8_CHECKS_H_