MIPS: Fix register usage of r20076.

src/mips/builtins-mips.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 455 matching lines @@
       // a3: object size (in words, including memento if create_memento)
       // t4: JSObject (not tagged)
       // t5: First in-object property of JSObject (not tagged)
       ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize);
 
       if (count_constructions) {
         __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
         __ lw(a0, FieldMemOperand(a2, Map::kInstanceSizesOffset));
         __ Ext(a0, a0, Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte,
                 kBitsPerByte);
-        __ sll(t0, a0, kPointerSizeLog2);
-        __ addu(a0, t5, t0);
+        __ sll(at, a0, kPointerSizeLog2);
+        __ addu(a0, t5, at);
+        __ sll(at, a3, kPointerSizeLog2);
+        __ Addu(t6, t4, Operand(at));   // End of object.
         // a0: offset of first field after pre-allocated fields
         if (FLAG_debug_code) {
           __ Assert(le, kUnexpectedNumberOfPreAllocatedPropertyFields,
               a0, Operand(t6));
         }
         __ InitializeFieldsWithFiller(t5, a0, t7);
         // To allow for truncation.
         __ LoadRoot(t7, Heap::kOnePointerFillerMapRootIndex);
-        __ sll(at, a3, kPointerSizeLog2);
-        __ Addu(a0, t4, Operand(at));  // End of object.
-        __ InitializeFieldsWithFiller(t5, a0, t7);
+        __ InitializeFieldsWithFiller(t5, t6, t7);
       } else if (create_memento) {
         __ Subu(t7, a3, Operand(AllocationMemento::kSize / kPointerSize));
         __ sll(at, t7, kPointerSizeLog2);
         __ Addu(a0, t4, Operand(at));  // End of object.
         __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
         __ InitializeFieldsWithFiller(t5, a0, t7);
 
         // Fill in memento fields.
         // t5: points to the allocated but uninitialized memento.
         __ LoadRoot(t7, Heap::kAllocationMementoMapRootIndex);
@@ skipping 1070 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(a3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS