1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_HYDROGEN_REDUNDANT_PHI_H_ 29#define V8_HYDROGEN_REDUNDANT_PHI_H_ 30 31#include "hydrogen.h" 32 33namespace v8 { 34namespace internal { 35 36 37// Replace all phis consisting of a single non-loop operand plus any number of 38// loop operands by that single non-loop operand. 39class HRedundantPhiEliminationPhase : public HPhase { 40 public: 41 explicit HRedundantPhiEliminationPhase(HGraph* graph) 42 : HPhase("H_Redundant phi elimination", graph) { } 43 44 void Run(); 45 void ProcessBlock(HBasicBlock* block); 46 47 private: 48 void ProcessPhis(const ZoneList<HPhi*>* phis); 49 50 DISALLOW_COPY_AND_ASSIGN(HRedundantPhiEliminationPhase); 51}; 52 53 54} } // namespace v8::internal 55 56#endif // V8_HYDROGEN_REDUNDANT_PHI_H_ 57