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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
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