[turbofan] Add backend support for float32.

src/compiler/x64/instruction-selector-x64.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"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 460 matching lines @@
 void InstructionSelector::VisitInt32UMod(Node* node) {
   VisitMod(this, node, kX64Udiv32);
 }
 
 
 void InstructionSelector::VisitInt64UMod(Node* node) {
   VisitMod(this, node, kX64Udiv);
 }
 
 
+void InstructionSelector::VisitChangeFloat32ToFloat64(Node* node) {
+  X64OperandGenerator g(this);
+  // TODO(turbofan): X64 SSE conversions should take an operand.
+  Emit(kSSECvtss2sd, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEInt32ToFloat64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitChangeUint32ToFloat64(Node* node) {
   X64OperandGenerator g(this);
   // TODO(turbofan): X64 SSE cvtqsi2sd should support operands.
   Emit(kSSEUint32ToFloat64, g.DefineAsRegister(node),
@@ skipping 18 matching lines @@
   Emit(kX64Movsxlq, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
   X64OperandGenerator g(this);
   Emit(kX64Movl, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
+  X64OperandGenerator g(this);
+  // TODO(turbofan): X64 SSE conversions should take an operand.
+  Emit(kSSECvtsd2ss, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   X64OperandGenerator g(this);
   Emit(kX64Movl, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitFloat64Add(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEFloat64Add, g.DefineSameAsFirst(node),
        g.UseRegister(node->InputAt(0)), g.UseRegister(node->InputAt(1)));
@@ skipping 185 matching lines @@
   call_instr->MarkAsCall();
   if (deoptimization != NULL) {
     DCHECK(continuation != NULL);
     call_instr->MarkAsControl();
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8