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_UINT32_ANALYSIS_H_ 29 #define V8_HYDROGEN_UINT32_ANALYSIS_H_ 30 31 #include "hydrogen.h" 32 33 namespace v8 { 34 namespace internal { 35 36 37 // Discover instructions that can be marked with kUint32 flag allowing 38 // them to produce full range uint32 values. 39 class HUint32AnalysisPhase : public HPhase { 40 public: HUint32AnalysisPhase(HGraph * graph)41 explicit HUint32AnalysisPhase(HGraph* graph) 42 : HPhase("H_Compute safe UInt32 operations", graph), phis_(4, zone()) { } 43 44 void Run(); 45 46 private: 47 INLINE(bool IsSafeUint32Use(HValue* val, HValue* use)); 48 INLINE(bool Uint32UsesAreSafe(HValue* uint32val)); 49 INLINE(bool CheckPhiOperands(HPhi* phi)); 50 INLINE(void UnmarkPhi(HPhi* phi, ZoneList<HPhi*>* worklist)); 51 INLINE(void UnmarkUnsafePhis()); 52 53 ZoneList<HPhi*> phis_; 54 }; 55 56 57 } } // namespace v8::internal 58 59 #endif // V8_HYDROGEN_UINT32_ANALYSIS_H_ 60