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/*
* Copyright (c) 2015, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief Edge redundancy graph reductions.
*/
#ifndef NG_EDGE_REDUNDANCY_H
#define NG_EDGE_REDUNDANCY_H
#include "som/som.h"
namespace ue2 {
class NGHolder;
struct CompileContext;
/** \brief Entry point: Runs all the edge redundancy passes. */
bool removeEdgeRedundancy(NGHolder &g, som_type som, const CompileContext &cc);
/** \brief Removes optional stuff from the front of floating patterns, since
* it's redundant with startDs.
*
* For each successor of startDs, remove any in-edges that aren't from either
* start or startDs. This allows us to prune redundant vertices at the start of
* a pattern:
*
* /(hat)?stand --> /stand/
*
*/
bool removeSiblingsOfStartDotStar(NGHolder &g);
/** \brief Removes all edges into virtual starts other than those from
* start/startDs, providing there is an edge from startDs.
*
* This operation is an optimisation for SOM mode. (see UE-1544) */
bool optimiseVirtualStarts(NGHolder &g);
} // namespace ue2
#endif
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