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kc3-lang/angle/src/tests/test_utils/ConstantFoldingTest.h

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  • Author : Olli Etuaho
    Date : 2016-12-19 19:53:29
    Hash : 72fc5547
    Message : Add a ShaderCompileTreeTest base class to use in compiler tests The test class provides facilities for parsing test shader source into an AST and determining compile status. Compilation flags change for some of the tests, but this should only have a minor effect on code coverage - mostly affecting non-core parts such as intermediate output. BUG=angleproject:1673 TEST=angle_unittests Change-Id: I7d0900ef490e021272a27c4b0c938bfee02abf39 Reviewed-on: https://chromium-review.googlesource.com/422367 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

  • src/tests/test_utils/ConstantFoldingTest.h 
  • //
// Copyright (c) 2016 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.
//
// ConstantFoldingTest.h:
//   Utilities for constant folding tests.
//

#ifndef TESTS_TEST_UTILS_CONSTANTFOLDINGTEST_H_
#define TESTS_TEST_UTILS_CONSTANTFOLDINGTEST_H_

#include <vector>

#include "common/mathutil.h"
#include "compiler/translator/IntermNode.h"
#include "tests/test_utils/ShaderCompileTreeTest.h"

namespace sh
{

class TranslatorESSL;

template <typename T>
class ConstantFinder : public TIntermTraverser
{
  public:
    ConstantFinder(const std::vector<T> &constantVector)
        : TIntermTraverser(true, false, false),
          mConstantVector(constantVector),
          mFaultTolerance(T()),
          mFound(false)
    {
    }

    ConstantFinder(const std::vector<T> &constantVector, const T &faultTolerance)
        : TIntermTraverser(true, false, false),
          mConstantVector(constantVector),
          mFaultTolerance(faultTolerance),
          mFound(false)
    {
    }

    ConstantFinder(const T &value)
        : TIntermTraverser(true, false, false), mFaultTolerance(T()), mFound(false)
    {
        mConstantVector.push_back(value);
    }

    void visitConstantUnion(TIntermConstantUnion *node)
    {
        if (node->getType().getObjectSize() == mConstantVector.size())
        {
            bool found = true;
            for (size_t i = 0; i < mConstantVector.size(); i++)
            {
                if (!isEqual(node->getUnionArrayPointer()[i], mConstantVector[i]))
                {
                    found = false;
                    break;
                }
            }
            if (found)
            {
                mFound = found;
            }
        }
    }

    bool found() const { return mFound; }

  private:
    bool isEqual(const TConstantUnion &node, const float &value) const
    {
        if (node.getType() != EbtFloat)
        {
            return false;
        }
        if (value == std::numeric_limits<float>::infinity())
        {
            return gl::isInf(node.getFConst()) && node.getFConst() > 0;
        }
        else if (value == -std::numeric_limits<float>::infinity())
        {
            return gl::isInf(node.getFConst()) && node.getFConst() < 0;
        }
        else if (gl::isNaN(value))
        {
            // All NaNs are treated as equal.
            return gl::isNaN(node.getFConst());
        }
        return mFaultTolerance >= fabsf(node.getFConst() - value);
    }

    bool isEqual(const TConstantUnion &node, const int &value) const
    {
        if (node.getType() != EbtInt)
        {
            return false;
        }
        ASSERT(mFaultTolerance < std::numeric_limits<int>::max());
        // abs() returns 0 at least on some platforms when the minimum int value is passed in (it
        // doesn't have a positive counterpart).
        return mFaultTolerance >= abs(node.getIConst() - value) &&
               (node.getIConst() - value) != std::numeric_limits<int>::min();
    }

    bool isEqual(const TConstantUnion &node, const unsigned int &value) const
    {
        if (node.getType() != EbtUInt)
        {
            return false;
        }
        ASSERT(mFaultTolerance < static_cast<unsigned int>(std::numeric_limits<int>::max()));
        return static_cast<int>(mFaultTolerance) >=
                   abs(static_cast<int>(node.getUConst() - value)) &&
               static_cast<int>(node.getUConst() - value) != std::numeric_limits<int>::min();
    }

    bool isEqual(const TConstantUnion &node, const bool &value) const
    {
        if (node.getType() != EbtBool)
        {
            return false;
        }
        return node.getBConst() == value;
    }

    std::vector<T> mConstantVector;
    T mFaultTolerance;
    bool mFound;
};

class ConstantFoldingTest : public ShaderCompileTreeTest
{
  public:
    ConstantFoldingTest() {}

  protected:
    ::GLenum getShaderType() const override { return GL_FRAGMENT_SHADER; }
    ShShaderSpec getShaderSpec() const override { return SH_GLES3_SPEC; }

    template <typename T>
    bool constantFoundInAST(T constant)
    {
        ConstantFinder<T> finder(constant);
        mASTRoot->traverse(&finder);
        return finder.found();
    }

    template <typename T>
    bool constantVectorFoundInAST(const std::vector<T> &constantVector)
    {
        ConstantFinder<T> finder(constantVector);
        mASTRoot->traverse(&finder);
        return finder.found();
    }

    template <typename T>
    bool constantColumnMajorMatrixFoundInAST(const std::vector<T> &constantMatrix)
    {
        return constantVectorFoundInAST(constantMatrix);
    }

    template <typename T>
    bool constantVectorNearFoundInAST(const std::vector<T> &constantVector, const T &faultTolerance)
    {
        ConstantFinder<T> finder(constantVector, faultTolerance);
        mASTRoot->traverse(&finder);
        return finder.found();
    }
};

class ConstantFoldingExpressionTest : public ConstantFoldingTest
{
  public:
    ConstantFoldingExpressionTest() {}

    void evaluateFloat(const std::string &floatExpression);
};

}  // namespace sh

#endif  // TESTS_TEST_UTILS_CONSTANTFOLDINGTEST_H_