MIPS: Optimize NumberTagU

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 71bacbae651a31e03bd9e376ca54665b2f13319a..3fb08ef7ce9b5f9bb16b001c26b706bc1b7797b8 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4708,13 +4708,12 @@ void LCodeGen::DoNumberTagU(LNumberTagU* instr) {
     LNumberTagU* instr_;
   };
 
-  LOperand* input = instr->value();
-  ASSERT(input->IsRegister() && input->Equals(instr->result()));
-  Register reg = ToRegister(input);
+  Register input = ToRegister(instr->value());
+  Register result = ToRegister(instr->result());
 
   DeferredNumberTagU* deferred = new(zone()) DeferredNumberTagU(this, instr);
-  __ Branch(deferred->entry(), hi, reg, Operand(Smi::kMaxValue));
-  __ SmiTag(reg, reg);
+  __ Branch(deferred->entry(), hi, input, Operand(Smi::kMaxValue));
+  __ SmiTag(result, input);
   __ bind(deferred->exit());
 }