MIPS: Orthogonalize Lithium binary op instructions.

src/mips/lithium-codegen-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 4926 matching lines @@
    private:
     LTaggedToI* instr_;
   };
 
   LOperand* input = instr->value();
   ASSERT(input->IsRegister());
   ASSERT(input->Equals(instr->result()));
 
   Register input_reg = ToRegister(input);
 
-  DeferredTaggedToI* deferred = new(zone()) DeferredTaggedToI(this, instr);
+  if (instr->hydrogen()->value()->representation().IsSmi()) {
+    __ SmiUntag(input_reg);
+  } else {
+    DeferredTaggedToI* deferred = new(zone()) DeferredTaggedToI(this, instr);
 
-  // Let the deferred code handle the HeapObject case.
-  __ JumpIfNotSmi(input_reg, deferred->entry());
+    // Let the deferred code handle the HeapObject case.
+    __ JumpIfNotSmi(input_reg, deferred->entry());
 
-  // Smi to int32 conversion.
-  __ SmiUntag(input_reg);
-  __ bind(deferred->exit());
+    // Smi to int32 conversion.
+    __ SmiUntag(input_reg);
+    __ bind(deferred->exit());
+  }
 }
 
 
 void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
   LOperand* input = instr->value();
   ASSERT(input->IsRegister());
   LOperand* result = instr->result();
   ASSERT(result->IsDoubleRegister());
 
   Register input_reg = ToRegister(input);
@@ skipping 818 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal