hydrogen-redundant-phi.h 2.24 KB
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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
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//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//
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#ifndef V8_HYDROGEN_REDUNDANT_PHI_H_
#define V8_HYDROGEN_REDUNDANT_PHI_H_

#include "hydrogen.h"

namespace v8 {
namespace internal {


// Replace all phis consisting of a single non-loop operand plus any number of
// loop operands by that single non-loop operand.
class HRedundantPhiEliminationPhase : public HPhase {
 public:
  explicit HRedundantPhiEliminationPhase(HGraph* graph)
      : HPhase("H_Redundant phi elimination", graph) { }

  void Run();
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  void ProcessBlock(HBasicBlock* block);
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 private:
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  void ProcessPhis(const ZoneList<HPhi*>* phis);

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  DISALLOW_COPY_AND_ASSIGN(HRedundantPhiEliminationPhase);
};


} }  // namespace v8::internal

#endif  // V8_HYDROGEN_REDUNDANT_PHI_H_