Use signaling NaN for holes in fixed double arrays.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index c4e0a9df406396918285493e150328c2ea725962..c1a0aafc43c1ad8f3142d0a97c36995e1b8f8f56 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3870,9 +3870,13 @@ void LCodeGen::DoMathLog(LMathLog* instr) {
   __ ucomisd(input_reg, xmm_scratch);
   __ j(above, &positive, Label::kNear);
   __ j(not_carry, &zero, Label::kNear);
-  ExternalReference nan =
-      ExternalReference::address_of_canonical_non_hole_nan();
-  __ movsd(input_reg, Operand::StaticVariable(nan));
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope scope2(masm(), AVX);
+    __ vdivsd(input_reg, xmm_scratch, xmm_scratch);
+  } else {
+    __ divsd(xmm_scratch, xmm_scratch);
+    __ movsd(input_reg, xmm_scratch);
+  }
   __ jmp(&done, Label::kNear);
   __ bind(&zero);
   ExternalReference ninf =
@@ -4226,8 +4230,6 @@ void LCodeGen::DoStoreKeyedExternalArray(LStoreKeyed* instr) {
 
 
 void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
-  ExternalReference canonical_nan_reference =
-      ExternalReference::address_of_canonical_non_hole_nan();
   Operand double_store_operand = BuildFastArrayOperand(
       instr->elements(),
       instr->key(),
@@ -4238,13 +4240,10 @@ void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
   XMMRegister value = ToDoubleRegister(instr->value());
 
   if (instr->NeedsCanonicalization()) {
-    Label have_value;
-
-    __ ucomisd(value, value);
-    __ j(parity_odd, &have_value, Label::kNear);  // NaN.
-
-    __ movsd(value, Operand::StaticVariable(canonical_nan_reference));
-    __ bind(&have_value);
+    XMMRegister xmm_scratch = double_scratch0();
+    // Turn potential sNaN value into qNaN.
+    __ xorps(xmm_scratch, xmm_scratch);
+    __ subsd(value, xmm_scratch);
   }
 
   __ movsd(double_store_operand, value);
@@ -4737,9 +4736,8 @@ void LCodeGen::EmitNumberUntagD(LNumberUntagD* instr, Register input_reg,
       __ cmp(input_reg, factory()->undefined_value());
       DeoptimizeIf(not_equal, instr, "not a heap number/undefined");
 
-      ExternalReference nan =
-          ExternalReference::address_of_canonical_non_hole_nan();
-      __ movsd(result_reg, Operand::StaticVariable(nan));
+      __ xorps(result_reg, result_reg);
+      __ divsd(result_reg, result_reg);
       __ jmp(&done, Label::kNear);
     }
   } else {