[turbofan] Match selects in control reducer (configurable).

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 575 matching lines @@
     AddReducer(data, &graph_reducer, &vn_reducer);
     AddReducer(data, &graph_reducer, &simple_reducer);
     AddReducer(data, &graph_reducer, &lowering);
     AddReducer(data, &graph_reducer, &machine_reducer);
     AddReducer(data, &graph_reducer, &common_reducer);
     graph_reducer.ReduceGraph();
   }
 };
 
 
-struct ControlReductionPhase {
+struct EarlyControlReductionPhase {
+  static const char* phase_name() { return "early control reduction"; }
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
-    ControlReducer::ReduceGraph(temp_zone, data->jsgraph(), data->common());
+    ControlReducer::ReduceGraph(temp_zone, data->jsgraph(), data->common(), 1);
   }
 };
 
 
-struct EarlyControlReductionPhase : ControlReductionPhase {
-  static const char* phase_name() { return "early control reduction"; }
+struct LateControlReductionPhase {
+  static const char* phase_name() { return "late control reduction"; }
+  void Run(PipelineData* data, Zone* temp_zone) {
+    SourcePositionTable::Scope pos(data->source_positions(),
+                                   SourcePosition::Unknown());
+    ControlReducer::ReduceGraph(temp_zone, data->jsgraph(), data->common(), 0);
+  }
 };
 
 
-struct LateControlReductionPhase : ControlReductionPhase {
-  static const char* phase_name() { return "late control reduction"; }
-};
-
-
 struct StressLoopPeelingPhase {
   static const char* phase_name() { return "stress loop peeling"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
     // Peel the first outer loop for testing.
     // TODO(titzer): peel all loops? the N'th loop? Innermost loops?
     LoopTree* loop_tree = LoopFinder::BuildLoopTree(data->graph(), temp_zone);
     if (loop_tree != NULL && loop_tree->outer_loops().size() > 0) {
@@ skipping 611 matching lines @@
 
   if (FLAG_trace_turbo && !data->MayHaveUnverifiableGraph()) {
     TurboCfgFile tcf(data->isolate());
     tcf << AsC1VAllocator("CodeGen", data->register_allocator());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8