MIPS: Convert NaN values back for ia32 when running on simulator.

src/serialize.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 731 matching lines @@
   Object** limit = current + (size >> kPointerSizeLog2);
   if (FLAG_log_snapshot_positions) {
     LOG(isolate_, SnapshotPositionEvent(address, source_->position()));
   }
   ReadChunk(current, limit, space_number, address);
 #ifdef DEBUG
   bool is_codespace = (space == HEAP->code_space()) ||
       ((space == HEAP->lo_space()) && (space_number == kLargeCode));
   ASSERT(HeapObject::FromAddress(address)->IsCode() == is_codespace);
 #endif
+
+#ifdef USE_SIMULATOR
+  // The serializer may have converted all x86 NaN values to MIPS NaN values.
+  // Convert them back. IsNaN returns true for both kinds of NaN.
+  // Alignment and speed are non-issues, as this only happens on the simulator.
+  HeapObject* obj = HeapObject::cast(*write_back);
+  if (obj->IsNaN()) HeapNumber::cast(obj)->set_value(OS::nan_value());
+#endif
 }
 
 
 // This macro is always used with a constant argument so it should all fold
 // away to almost nothing in the generated code.  It might be nicer to do this
 // with the ternary operator but there are type issues with that.
 #define ASSIGN_DEST_SPACE(space_number)                                        \
   Space* dest_space;                                                           \
   if (space_number == NEW_SPACE) {                                             \
     dest_space = isolate->heap()->new_space();                                \
@@ skipping 939 matching lines @@
 int Serializer::SpaceAreaSize(int space) {
   if (space == CODE_SPACE) {
     return isolate_->memory_allocator()->CodePageAreaSize();
   } else {
     return Page::kPageSize - Page::kObjectStartOffset;
   }
 }
 
 
 } }  // namespace v8::internal