Port of r19288 to a64: Fix for smi stores optimization.

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 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 5085 matching lines @@
   if (access.IsInobject()) {
     destination = object;
   } else {
     __ Ldr(temp0, FieldMemOperand(object, JSObject::kPropertiesOffset));
     destination = temp0;
   }
 
   if (representation.IsSmi() &&
       instr->hydrogen()->value()->representation().IsInteger32()) {
     ASSERT(instr->hydrogen()->store_mode() == STORE_TO_INITIALIZED_ENTRY);
+#ifdef DEBUG
+    __ Ldr(temp1, FieldMemOperand(destination, offset));
+    __ AssertSmi(temp1);
+#endif
     STATIC_ASSERT(kSmiValueSize == 32 && kSmiShift == 32 && kSmiTag == 0);
     __ Store(value, UntagSmiFieldMemOperand(destination, offset),
              Representation::Integer32());
   } else {
     __ Store(value, FieldMemOperand(destination, offset), representation);
   }
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     __ RecordWriteField(destination,
                         offset,
                         value,      // Clobbered.
@@ skipping 581 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal