Refactoring only: Make it clear that MOD is special.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 662cfce6a037ff77b3b7d58c695ded2b24923524..3a7366e324699dfdfb8ae6b3f42760298b0984e0 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -760,16 +760,17 @@ LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
   ASSERT(instr->representation().IsDouble());
   ASSERT(instr->left()->representation().IsDouble());
   ASSERT(instr->right()->representation().IsDouble());
-  LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
-  LOperand* right = NULL;
   if (op == Token::MOD) {
-    right = UseFixedDouble(instr->BetterRightOperand(), xmm1);
+    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
+    LOperand* right = UseFixedDouble(instr->BetterRightOperand(), xmm1);
     LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
     return MarkAsCall(DefineSameAsFirst(result), instr);
+  } else {
+    LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
+    LOperand* right = UseRegisterAtStart(instr->BetterRightOperand());
+    LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
+    return DefineSameAsFirst(result);
   }
-  right = UseRegisterAtStart(instr->BetterRightOperand());
-  LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
-  return DefineSameAsFirst(result);
 }