[turbofan] Initial import of SimplifiedOperatorReducer.

src/compiler/simplified-operator-reducer.h

+// 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.
+
+#ifndef V8_COMPILER_SIMPLIFIED_OPERATOR_REDUCER_H_
+#define V8_COMPILER_SIMPLIFIED_OPERATOR_REDUCER_H_
+
+#include "src/compiler/graph-reducer.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations.
+class Heap;
+
+namespace compiler {
+
+// Forward declarations.
+class JSGraph;
+class MachineOperatorBuilder;
+
+class SimplifiedOperatorReducer V8_FINAL : public Reducer {
+ public:
+  SimplifiedOperatorReducer(JSGraph* jsgraph, MachineOperatorBuilder* machine)
+      : jsgraph_(jsgraph), machine_(machine) {}
+  virtual ~SimplifiedOperatorReducer();
+
+  virtual Reduction Reduce(Node* node) V8_OVERRIDE;
+
+ private:
+  Reduction Change(Node* node, Operator* op, Node* a);
+  Reduction ReplaceFloat64(double value);
+  Reduction ReplaceInt32(int32_t value);
+  Reduction ReplaceUint32(uint32_t value) {
+    return ReplaceInt32(static_cast<int32_t>(value));
+  }
+  Reduction ReplaceNumber(double value);
+  Reduction ReplaceNumber(int32_t value);
+
+  Graph* graph() const;
+  Heap* heap() const;
+  JSGraph* jsgraph() const { return jsgraph_; }
+  MachineOperatorBuilder* machine() const { return machine_; }
+
+  JSGraph* jsgraph_;
+  MachineOperatorBuilder* machine_;
+
+  DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorReducer);
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_REDUCER_H_