1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_HYDROGEN_REDUNDANT_PHI_H_
6 #define V8_HYDROGEN_REDUNDANT_PHI_H_
7 
8 #include "src/hydrogen.h"
9 
10 namespace v8 {
11 namespace internal {
12 
13 
14 // Replace all phis consisting of a single non-loop operand plus any number of
15 // loop operands by that single non-loop operand.
16 class HRedundantPhiEliminationPhase : public HPhase {
17  public:
HRedundantPhiEliminationPhase(HGraph * graph)18   explicit HRedundantPhiEliminationPhase(HGraph* graph)
19       : HPhase("H_Redundant phi elimination", graph) { }
20 
21   void Run();
22   void ProcessBlock(HBasicBlock* block);
23 
24  private:
25   void ProcessPhis(const ZoneList<HPhi*>* phis);
26 
27   DISALLOW_COPY_AND_ASSIGN(HRedundantPhiEliminationPhase);
28 };
29 
30 
31 } }  // namespace v8::internal
32 
33 #endif  // V8_HYDROGEN_REDUNDANT_PHI_H_
34