kc3-lang/angle/src/compiler/ForLoopUnroll.h

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  Commit

• Author : zmo@google.com
  Date : 2011-08-17 19:39:58
  Hash : 0c6bb7a6
  Message : Add an compile option to unroll for-loops with integer indices. ANGLEBUG=193 TEST=with this option, for-loops with integer indices will be unrolled. Review URL: http://codereview.appspot.com/4899047 git-svn-id: https://angleproject.googlecode.com/svn/trunk@734 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/ForLoopUnroll.h

• //
  // Copyright (c) 2011 The ANGLE 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 "compiler/intermediate.h"
  
  struct TLoopIndexInfo {
      int id;
      int initValue;
      int stopValue;
      int incrementValue;
      TOperator op;
      int currentValue;
  };
  
  class ForLoopUnroll {
  public:
      ForLoopUnroll() { }
  
      void FillLoopIndexInfo(TIntermLoop* node, TLoopIndexInfo& info);
  
      // Update the info.currentValue for the next loop iteration.
      void Step();
  
      // Return false if loop condition is no longer satisfied.
      bool SatisfiesLoopCondition();
  
      // Check if the symbol is the index of a loop that's unrolled.
      bool NeedsToReplaceSymbolWithValue(TIntermSymbol* symbol);
  
      // Return the current value of a given loop index symbol.
      int GetLoopIndexValue(TIntermSymbol* symbol);
  
      void Push(TLoopIndexInfo& info);
      void Pop();
  
      static void MarkForLoopsWithIntegerIndicesForUnrolling(TIntermNode* root);
  
  private:
      int getLoopIncrement(TIntermLoop* node);
  
      int evaluateIntConstant(TIntermConstantUnion* node);
  
      TVector<TLoopIndexInfo> mLoopIndexStack;
  };