X87: [turbofan] Add support for reinterpreting integers as floating point and vice versa.

src/compiler/x87/instruction-selector-x87.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/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
@@ skipping 647 matching lines @@
     case TruncationMode::kRoundToZero:
       Emit(kX87Float64ToInt32, g.DefineAsRegister(node),
            g.Use(node->InputAt(0)));
       return;
   }
   UNREACHABLE();
 }
 
 
 void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
-  UNIMPLEMENTED();
+  X87OperandGenerator g(this);
+  Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
+  Emit(kX87BitcastFI, g.DefineAsRegister(node), 0, NULL);
 }
 
 
 void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
-  UNIMPLEMENTED();
+  X87OperandGenerator g(this);
+  Emit(kX87BitcastIF, g.DefineAsFixed(node, stX_0), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitFloat32Add(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(0)));
   Emit(kX87PushFloat32, g.NoOutput(), g.Use(node->InputAt(1)));
   Emit(kX87Float32Add, g.DefineAsFixed(node, stX_0), 0, NULL);
 }
 
@@ skipping 677 matching lines @@
       MachineOperatorBuilder::kFloat32Min |
       MachineOperatorBuilder::kFloat64Max |
       MachineOperatorBuilder::kFloat64Min |
       MachineOperatorBuilder::kWord32ShiftIsSafe;
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8