Use xorps to break the cvtsi2sd unnecessary dependence due to its partially written

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index f216019963e2abeef5704700f9ce737ed327cd50..9e718b85ff868f58d263e6f882132dacca10656f 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3519,7 +3519,7 @@ void LCodeGen::DoMathFloor(LMathFloor* instr) {
     __ bind(&negative_sign);
     // Truncate, then compare and compensate.
     __ cvttsd2si(output_reg, input_reg);
-    __ cvtlsi2sd(xmm_scratch, output_reg);
+    __ Cvtlsi2sd(xmm_scratch, output_reg);
     __ ucomisd(input_reg, xmm_scratch);
     __ j(equal, &done, Label::kNear);
     __ subl(output_reg, Immediate(1));
@@ -3568,7 +3568,7 @@ void LCodeGen::DoMathRound(LMathRound* instr) {
   __ RecordComment("D2I conversion overflow");
   DeoptimizeIf(equal, instr->environment());
 
-  __ cvtlsi2sd(xmm_scratch, output_reg);
+  __ Cvtlsi2sd(xmm_scratch, output_reg);
   __ ucomisd(input_reg, xmm_scratch);
   __ j(equal, &restore, Label::kNear);
   __ subl(output_reg, Immediate(1));
@@ -4474,9 +4474,9 @@ void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
   LOperand* output = instr->result();
   ASSERT(output->IsDoubleRegister());
   if (input->IsRegister()) {
-    __ cvtlsi2sd(ToDoubleRegister(output), ToRegister(input));
+    __ Cvtlsi2sd(ToDoubleRegister(output), ToRegister(input));
   } else {
-    __ cvtlsi2sd(ToDoubleRegister(output), ToOperand(input));
+    __ Cvtlsi2sd(ToDoubleRegister(output), ToOperand(input));
   }
 }
 
@@ -4693,7 +4693,7 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
   // Smi to XMM conversion
   __ bind(&load_smi);
   __ SmiToInteger32(kScratchRegister, input_reg);
-  __ cvtlsi2sd(result_reg, kScratchRegister);
+  __ Cvtlsi2sd(result_reg, kScratchRegister);
   __ bind(&done);
 }
 
@@ -4729,7 +4729,7 @@ void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
     XMMRegister xmm_temp = ToDoubleRegister(instr->temp());
     __ movsd(xmm0, FieldOperand(input_reg, HeapNumber::kValueOffset));
     __ cvttsd2si(input_reg, xmm0);
-    __ cvtlsi2sd(xmm_temp, input_reg);
+    __ Cvtlsi2sd(xmm_temp, input_reg);
     __ ucomisd(xmm0, xmm_temp);
     DeoptimizeIf(not_equal, instr->environment());
     DeoptimizeIf(parity_even, instr->environment());  // NaN.
@@ -4811,7 +4811,7 @@ void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
     DeoptimizeIf(equal, instr->environment());
   } else {
     __ cvttsd2si(result_reg, input_reg);
-    __ cvtlsi2sd(xmm0, result_reg);
+    __ Cvtlsi2sd(xmm0, result_reg);
     __ ucomisd(xmm0, input_reg);
     DeoptimizeIf(not_equal, instr->environment());
     DeoptimizeIf(parity_even, instr->environment());  // NaN.
@@ -4845,7 +4845,7 @@ void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
 
   Label done;
   __ cvttsd2si(result_reg, input_reg);
-  __ cvtlsi2sd(xmm0, result_reg);
+  __ Cvtlsi2sd(xmm0, result_reg);
   __ ucomisd(xmm0, input_reg);
   DeoptimizeIf(not_equal, instr->environment());
   DeoptimizeIf(parity_even, instr->environment());  // NaN.