[turbofan] Add support for reinterpreting integers as floating point and vice versa.

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 1258 matching lines @@
       Emit(kArm64Lsr, g.DefineAsRegister(node), g.UseRegister(m.left().node()),
            g.UseImmediate(m.right().node()));
       return;
     }
   }
 
   Emit(kArm64Mov32, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
 }
 
 
+void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
+  VisitRR(this, kArm64Float64ExtractLowWord32, node);
+}
+
+
+void InstructionSelector::VisitBitcastFloat64ToInt64(Node* node) {
+  VisitRR(this, kArm64U64MoveFloat64, node);
+}
+
+
+void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
+  VisitRR(this, kArm64Float64MoveU64, node);
+}
+
+
+void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
+  VisitRR(this, kArm64Float64MoveU64, node);
+}
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   VisitRRR(this, kArm64Float32Add, node);
 }
 
 
 void InstructionSelector::VisitFloat64Add(Node* node) {
   VisitRRR(this, kArm64Float64Add, node);
 }
 
 
@@ skipping 794 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8