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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/angle/src/compiler/ForLoopUnroll.h	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,52 @@
     1.4 +//
     1.5 +// Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
     1.6 +// Use of this source code is governed by a BSD-style license that can be
     1.7 +// found in the LICENSE file.
     1.8 +//
     1.9 +
    1.10 +#ifndef ForLoopUnroll_h
    1.11 +#define ForLoopUnroll_h
    1.12 +
    1.13 +#include "compiler/intermediate.h"
    1.14 +
    1.15 +struct TLoopIndexInfo {
    1.16 +    int id;
    1.17 +    int initValue;
    1.18 +    int stopValue;
    1.19 +    int incrementValue;
    1.20 +    TOperator op;
    1.21 +    int currentValue;
    1.22 +};
    1.23 +
    1.24 +class ForLoopUnroll {
    1.25 +public:
    1.26 +    ForLoopUnroll() { }
    1.27 +
    1.28 +    void FillLoopIndexInfo(TIntermLoop* node, TLoopIndexInfo& info);
    1.29 +
    1.30 +    // Update the info.currentValue for the next loop iteration.
    1.31 +    void Step();
    1.32 +
    1.33 +    // Return false if loop condition is no longer satisfied.
    1.34 +    bool SatisfiesLoopCondition();
    1.35 +
    1.36 +    // Check if the symbol is the index of a loop that's unrolled.
    1.37 +    bool NeedsToReplaceSymbolWithValue(TIntermSymbol* symbol);
    1.38 +
    1.39 +    // Return the current value of a given loop index symbol.
    1.40 +    int GetLoopIndexValue(TIntermSymbol* symbol);
    1.41 +
    1.42 +    void Push(TLoopIndexInfo& info);
    1.43 +    void Pop();
    1.44 +
    1.45 +    static void MarkForLoopsWithIntegerIndicesForUnrolling(TIntermNode* root);
    1.46 +
    1.47 +private:
    1.48 +    int getLoopIncrement(TIntermLoop* node);
    1.49 +
    1.50 +    int evaluateIntConstant(TIntermConstantUnion* node);
    1.51 +
    1.52 +    TVector<TLoopIndexInfo> mLoopIndexStack;
    1.53 +};
    1.54 +
    1.55 +#endif