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

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1558 matching lines @@
   VisitFloat64Compare(this, node, &cont);
 }
 
 
 void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kUnsignedLessThanOrEqual, node);
   VisitFloat64Compare(this, node, &cont);
 }
 
 
+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() {
   return MachineOperatorBuilder::kFloat64Floor |
          MachineOperatorBuilder::kFloat64Ceil |
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8