MIPS: Specialize FixedTypedArray<> set and get functions to solve unaligned double access.

src/objects.h

 // 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
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@@ skipping 4881 matching lines @@
   typedef typename Traits::ElementType ElementType;
   static const InstanceType kInstanceType = Traits::kInstanceType;
 
   // Casting:
   static inline FixedTypedArray<Traits>* cast(Object* obj);
 
   static inline int SizeFor(int length) {
     return kDataOffset + length * sizeof(ElementType);
   }
 
+  static inline int ElementOffset(int index) {
+    return SizeFor(index);

[Dmitry Lomov (no reviews), 2014/01/30 18:34:03]

Please express them the other way round, i.e. SizeFor(index) is
ElementOffset(length). In that way, if we decide in the future to stick more
stuff at the end of FixedTypedArray, ElementOffset won't be affected.

[kilvadyb, 2014/01/30 19:24:52]

Done.

+  }
+
   inline ElementType get_scalar(int index);
   MUST_USE_RESULT inline MaybeObject* get(int index);
   inline void set(int index, ElementType value);
 
   // This accessor applies the correct conversion from Smi, HeapNumber
   // and undefined.
   MUST_USE_RESULT MaybeObject* SetValue(uint32_t index, Object* value);
 
   static Handle<Object> SetValue(Handle<FixedTypedArray<Traits> > array,
                                  uint32_t index,
@@ skipping 5855 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_