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

src/compiler/ppc/instruction-selector-ppc.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"
 #include "src/ppc/frames-ppc.h"
 
@@ skipping 892 matching lines @@
 
 
 #if V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   // TODO(mbrandy): inspect input to see if nop is appropriate.
   VisitRR(this, kPPC_Int64ToInt32, node);
 }
 #endif
 
 
+void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
+  VisitRR(this, kPPC_DoubleExtractLowWord32, node);
+}
+
+
+#if V8_TARGET_ARCH_PPC64
+void InstructionSelector::VisitBitcastFloat64ToInt64(Node* node) {
+  VisitRR(this, kPPC_BitcastDL, node);
+}
+#endif
+
+
+void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
+  PPCOperandGenerator g(this);
+  Emit(kPPC_DoubleInsertLowWord32, g.DefineAsRegister(node),
+       ImmediateOperand(ImmediateOperand::INLINE, 0),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
+#if V8_TARGET_ARCH_PPC64
+void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
+  VisitRR(this, kPPC_BitcastLD, node);
+}
+#endif
+
+
 void InstructionSelector::VisitFloat32Add(Node* node) {
   VisitRRR(this, kPPC_AddDouble, node);
 }
 
 
 void InstructionSelector::VisitFloat64Add(Node* node) {
   // TODO(mbrandy): detect multiply-add
   VisitRRR(this, kPPC_AddDouble, node);
 }
 
@@ skipping 755 matching lines @@
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8