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

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index e08226d5f3e44eed89f623d0882c4cf487ef24f6..5c8c7a1fd8643a5077d5e176525cff4cfd959bda 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -1394,6 +1394,34 @@ void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
 }
 
 
+void InstructionSelector::VisitFloat64ExtractWord32(Node* node) {
+  ArmOperandGenerator g(this);
+  InstructionCode opcode =
+      (OpParameter<int>(node) == 0 ? kArmVmovLowU32F64 : kArmVmovHighU32F64);
+  Emit(opcode, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
+void InstructionSelector::VisitFloat64InsertWord32(Node* node) {
+  ArmOperandGenerator g(this);
+  Node* left = node->InputAt(0);
+  Node* right = node->InputAt(1);
+  if (left->opcode() == IrOpcode::kFloat64InsertWord32 &&
+      OpParameter<int>(left) == 1 - OpParameter<int>(node) &&
+      CanCover(node, left)) {
+    left = left->InputAt(1);
+    if (OpParameter<int>(node) == 0) std::swap(left, right);
+    Emit(kArmVmovF64U32U32, g.DefineAsRegister(node), g.UseRegister(left),
+         g.UseRegister(right));
+    return;
+  }
+  InstructionCode opcode =
+      (OpParameter<int>(node) == 0) ? kArmVmovLowF64U32 : kArmVmovHighF64U32;
+  Emit(opcode, g.DefineSameAsFirst(node), g.UseRegister(left),
+       g.UseRegister(right));
+}
+
+
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {