RewriteUnaryMinusOperatorFloat.cpp

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//

// Copyright 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.

//

#include "compiler/translator/tree_ops/apple/RewriteUnaryMinusOperatorFloat.h"

#include "compiler/translator/tree_util/IntermNode_util.h"

#include "compiler/translator/tree_util/IntermTraverse.h"

namespace sh

namespace

class Traverser : public TIntermTraverser

  public:

    [[nodiscard]] static bool Apply(TCompiler *compiler, TIntermNode *root);

  private:

    Traverser();

    bool visitUnary(Visit visit, TIntermUnary *node) override;

    void nextIteration();

    bool mFound = false;

};

// static

bool Traverser::Apply(TCompiler *compiler, TIntermNode *root)

    Traverser traverser;

do

        traverser.nextIteration();

        root->traverse(&traverser);

        if (traverser.mFound)

            if (!traverser.updateTree(compiler, root))

                return false;

    } while (traverser.mFound);

    return true;

Traverser::Traverser() : TIntermTraverser(true, false, false) {}

void Traverser::nextIteration()

    mFound = false;

bool Traverser::visitUnary(Visit visit, TIntermUnary *node)

    if (mFound)

        return false;

    // Detect if the current operator is unary minus operator.

    if (node->getOp() != EOpNegative)

        return true;

    // Detect if the current operand is a float variable.

    TIntermTyped *fValue = node->getOperand();

    if (!fValue->getType().isScalarFloat())

        return true;

    // 0.0 - float

    TIntermTyped *zero = CreateZeroNode(fValue->getType());

    zero->setLine(fValue->getLine());

    TIntermBinary *sub = new TIntermBinary(EOpSub, zero, fValue);

    sub->setLine(fValue->getLine());

    queueReplacement(sub, OriginalNode::IS_DROPPED);

    mFound = true;

    return false;

}  // anonymous namespace

bool RewriteUnaryMinusOperatorFloat(TCompiler *compiler, TIntermNode *root)

    return Traverser::Apply(compiler, root);

}  // namespace sh