MIPS: Do not omit the write-barrier if the input value is a smi.

src/mips/stub-cache-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 576 matching lines @@
   if (index < 0) {
     // Set the property straight into the object.
     int offset = object->map()->instance_size() + (index * kPointerSize);
     if (FLAG_track_double_fields && representation.IsDouble()) {
       __ sw(storage_reg, FieldMemOperand(receiver_reg, offset));
     } else {
       __ sw(value_reg, FieldMemOperand(receiver_reg, offset));
     }
 
     if (!FLAG_track_fields || !representation.IsSmi()) {
-      // Skip updating write barrier if storing a smi.
-      __ JumpIfSmi(value_reg, &exit);
-
       // Update the write barrier for the array address.
       // Pass the now unused name_reg as a scratch register.
       if (!FLAG_track_double_fields || !representation.IsDouble()) {
         __ mov(name_reg, value_reg);
       } else {
         ASSERT(storage_reg.is(name_reg));
       }
       __ RecordWriteField(receiver_reg,
                           offset,
                           name_reg,
                           scratch1,
                           kRAHasNotBeenSaved,
                           kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           smi_check);
     }
   } else {
     // Write to the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
     // Get the properties array
     __ lw(scratch1,
           FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
     if (FLAG_track_double_fields && representation.IsDouble()) {
       __ sw(storage_reg, FieldMemOperand(scratch1, offset));
     } else {
       __ sw(value_reg, FieldMemOperand(scratch1, offset));
     }
 
     if (!FLAG_track_fields || !representation.IsSmi()) {
-      // Skip updating write barrier if storing a smi.
-      __ JumpIfSmi(value_reg, &exit);
-
       // Update the write barrier for the array address.
       // Ok to clobber receiver_reg and name_reg, since we return.
       if (!FLAG_track_double_fields || !representation.IsDouble()) {
         __ mov(name_reg, value_reg);
       } else {
         ASSERT(storage_reg.is(name_reg));
       }
       __ RecordWriteField(scratch1,
                           offset,
                           name_reg,
@@ skipping 3193 matching lines @@
     TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS