ARM: Enable VFP default NaN mode

src/hydrogen-instructions.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 3036 matching lines @@
   // these can load arbitrary representation of NaN.
 
   if (value()->IsConstant()) {
     return false;
   }
 
   if (value()->IsLoadKeyed()) {
     return IsExternalFloatOrDoubleElementsKind(
         HLoadKeyed::cast(value())->elements_kind());
   }
+#ifdef V8_TARGET_ARCH_ARM

[ulan, 2013/04/15 07:43:01]

We try to avoid adding arch dependent ifdefs in hydrogen. Can we push this down
to lithium?

+  if (value()->IsAdd() || value()->IsSub() ||
+      value()->IsMul() || value()->IsDiv()) {
+    return false;
+  }
+#endif
 
   if (value()->IsChange()) {
     if (HChange::cast(value())->from().IsInteger32()) {
       return false;
     }
     if (HChange::cast(value())->value()->type().IsSmi()) {
       return false;
     }
   }
   return true;
@@ skipping 466 matching lines @@
 
 
 void HCheckFunction::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal