chromium/third_party/angle/src/compiler/translator/tree_ops/RecordConstantPrecision.cpp

//
// Copyright 2002 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.
//
// During parsing, all constant expressions are folded to constant union nodes. The expressions that
// have been folded may have had precision qualifiers, which should affect the precision of the
// consuming operation. If the folded constant union nodes are written to output as such they won't
// have any precision qualifiers, and their effect on the precision of the consuming operation is
// lost.
//
// RecordConstantPrecision is an AST traverser that inspects the precision qualifiers of constants
// and hoists the constants outside the containing expression as precision qualified named variables
// in case that is required for correct precision propagation.
//

#include "compiler/translator/tree_ops/RecordConstantPrecision.h"

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

namespace sh
{

namespace
{

class RecordConstantPrecisionTraverser : public TIntermTraverser
{ … };

RecordConstantPrecisionTraverser::RecordConstantPrecisionTraverser(TSymbolTable *symbolTable)
    : … { … }

bool RecordConstantPrecisionTraverser::operandAffectsParentOperationPrecision(TIntermTyped *operand)
{ … }

void RecordConstantPrecisionTraverser::visitConstantUnion(TIntermConstantUnion *node)
{ … }

}  // namespace

bool RecordConstantPrecision(TCompiler *compiler, TIntermNode *root, TSymbolTable *symbolTable)
{ … }

}  // namespace sh