[x64] introduce vex prefix version of float64 arithmetic binop

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 7882253b21e9ae8bdc3ee5628220f623466bbc35..38d0197cbd319769553f97f85f83bf09c4d466f0 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -736,29 +736,49 @@ void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
 
 void InstructionSelector::VisitFloat64Add(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEFloat64Add, g.DefineSameAsFirst(node),
-       g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  if (IsSupported(AVX)) {
+    Emit(kAVXFloat64Add, g.DefineAsRegister(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  } else {
+    Emit(kSSEFloat64Add, g.DefineSameAsFirst(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  }
 }
 
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEFloat64Sub, g.DefineSameAsFirst(node),
-       g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  if (IsSupported(AVX)) {
+    Emit(kAVXFloat64Sub, g.DefineAsRegister(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  } else {
+    Emit(kSSEFloat64Sub, g.DefineSameAsFirst(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  }
 }
 
 
 void InstructionSelector::VisitFloat64Mul(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEFloat64Mul, g.DefineSameAsFirst(node),
-       g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  if (IsSupported(AVX)) {
+    Emit(kAVXFloat64Mul, g.DefineAsRegister(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  } else {
+    Emit(kSSEFloat64Mul, g.DefineSameAsFirst(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  }
 }
 
 
 void InstructionSelector::VisitFloat64Div(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEFloat64Div, g.DefineSameAsFirst(node),
-       g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  if (IsSupported(AVX)) {
+    Emit(kAVXFloat64Div, g.DefineAsRegister(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  } else {
+    Emit(kSSEFloat64Div, g.DefineSameAsFirst(node),
+         g.UseRegister(node->InputAt(0)), g.Use(node->InputAt(1)));
+  }
 }