[turbofan] Also run MachineOperatorReducer in SimplifiedLoweringPhase.

src/compiler/pipeline.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/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 424 matching lines @@
 struct SimplifiedLoweringPhase {
   static const char* phase_name() { return "simplified lowering"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
     SimplifiedLowering lowering(data->jsgraph());
     lowering.LowerAllNodes();
     ValueNumberingReducer vn_reducer(temp_zone);
     SimplifiedOperatorReducer simple_reducer(data->jsgraph());
+    MachineOperatorReducer machine_reducer(data->jsgraph());
     GraphReducer graph_reducer(data->graph(), temp_zone);
     graph_reducer.AddReducer(&vn_reducer);
     graph_reducer.AddReducer(&simple_reducer);
+    graph_reducer.AddReducer(&machine_reducer);
     graph_reducer.ReduceGraph();
   }
 };
 
 
 struct ChangeLoweringPhase {
   static const char* phase_name() { return "change lowering"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
     Linkage linkage(data->graph_zone(), data->info());
     ValueNumberingReducer vn_reducer(temp_zone);
     SimplifiedOperatorReducer simple_reducer(data->jsgraph());
     ChangeLowering lowering(data->jsgraph(), &linkage);
-    MachineOperatorReducer mach_reducer(data->jsgraph());
+    MachineOperatorReducer machine_reducer(data->jsgraph());
     GraphReducer graph_reducer(data->graph(), temp_zone);
-    // TODO(titzer): Figure out if we should run all reducers at once here.
     graph_reducer.AddReducer(&vn_reducer);
     graph_reducer.AddReducer(&simple_reducer);
     graph_reducer.AddReducer(&lowering);
-    graph_reducer.AddReducer(&mach_reducer);
+    graph_reducer.AddReducer(&machine_reducer);
     graph_reducer.ReduceGraph();
   }
 };
 
 
 struct ControlReductionPhase {
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
     ControlReducer::ReduceGraph(temp_zone, data->jsgraph(), data->common());
@@ skipping 597 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8