Return the original value when assigning to a pixel array

src/ia32/ic-ia32.cc

 // Copyright 2006-2008 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 403 matching lines @@
   __ cmp(FieldOperand(ecx, HeapObject::kMapOffset),
          Immediate(Factory::pixel_array_map()));
   __ j(not_equal, &slow);
   // Check that the value is a smi. If a conversion is needed call into the
   // runtime to convert and clamp.
   __ test(eax, Immediate(kSmiTagMask));
   __ j(not_zero, &slow);
   __ sar(ebx, kSmiTagSize);  // Untag the index.
   __ cmp(ebx, FieldOperand(ecx, PixelArray::kLengthOffset));
   __ j(above_equal, &slow);
+  __ mov(edx, eax);  // Save the value.
   __ sar(eax, kSmiTagSize);  // Untag the value.
   {  // Clamp the value to [0..255].
     Label done, check_255;
     __ cmp(eax, 0);
     __ j(greater_equal, &check_255);
     __ mov(eax, Immediate(0));
     __ jmp(&done);
     __ bind(&check_255);
     __ cmp(eax, 255);
     __ j(less_equal, &done);
     __ mov(eax, Immediate(255));
     __ bind(&done);
   }
   __ mov(ecx, FieldOperand(ecx, PixelArray::kExternalPointerOffset));
   __ mov_b(Operand(ecx, ebx, times_1, 0), eax);
+  __ mov(eax, edx);  // Return the original value.
   __ ret(0);
 
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one
   // element to the array by writing to array[array.length].
   __ bind(&extra);
   // eax: value
   // edx: JSArray
   // ecx: FixedArray
   // ebx: index (as a smi)
@@ skipping 583 matching lines @@
 
   // Do tail-call to runtime routine.
   __ TailCallRuntime(
       ExternalReference(IC_Utility(kSharedStoreIC_ExtendStorage)), 3, 1);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal