[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 1a071cd2d872e1fdec67ad84d3fb50befc19e05f..a27bd88733ee56e9ce8cdcfa40a7d4af3e63d114 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1576,6 +1576,40 @@ void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
 }
 
 
+void InstructionSelector::VisitFloat64ExtractLowWord32(Node* node) {
+  Arm64OperandGenerator g(this);
+  Emit(kArm64Float64ExtractLowWord32, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
+void InstructionSelector::VisitFloat64ExtractHighWord32(Node* node) {
+  Arm64OperandGenerator g(this);
+  Emit(kArm64Float64ExtractHighWord32, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
+void InstructionSelector::VisitFloat64InsertLowWord32(Node* node) {
+  // TODO(arm64): Some AArch64 specialist should be able to improve this.
+  Arm64OperandGenerator g(this);
+  Node* left = node->InputAt(0);
+  Node* right = node->InputAt(1);
+  Emit(kArm64Float64InsertLowWord32, g.DefineAsRegister(node),
+       g.UseRegister(left), g.UseRegister(right));
+}
+
+
+void InstructionSelector::VisitFloat64InsertHighWord32(Node* node) {
+  // TODO(arm64): Some AArch64 specialist should be able to improve this.
+  Arm64OperandGenerator g(this);
+  Node* left = node->InputAt(0);
+  Node* right = node->InputAt(1);
+  Emit(kArm64Float64InsertHighWord32, g.DefineAsRegister(node),
+       g.UseRegister(left), g.UseRegister(right));
+}
+
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {