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/**CFile****************************************************************
FileName [rwtDec.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [DAG-aware AIG rewriting package.]
Synopsis [Evaluation and decomposition procedures.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: rwtDec.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "rwt.h"
#include "deco.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode );
static Dec_Edge_t Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Preprocesses computed library of subgraphs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Rwt_ManPreprocess( Rwt_Man_t * p )
{
Dec_Graph_t * pGraph;
Rwt_Node_t * pNode;
int i, k;
// put the nodes into the structure
p->pMapInv = ABC_ALLOC( unsigned short, 222 );
memset( p->pMapInv, 0, sizeof(unsigned short) * 222 );
p->vClasses = Vec_VecStart( 222 );
for ( i = 0; i < p->nFuncs; i++ )
{
if ( p->pTable[i] == NULL )
continue;
// consider all implementations of this function
for ( pNode = p->pTable[i]; pNode; pNode = pNode->pNext )
{
assert( pNode->uTruth == p->pTable[i]->uTruth );
assert( p->pMap[pNode->uTruth] < 222 ); // Always >= 0 b/c unsigned.
Vec_VecPush( p->vClasses, p->pMap[pNode->uTruth], pNode );
p->pMapInv[ p->pMap[pNode->uTruth] ] = p->puCanons[pNode->uTruth];
}
}
// compute decomposition forms for each node and verify them
Vec_VecForEachEntry( Rwt_Node_t *, p->vClasses, pNode, i, k )
{
pGraph = Rwt_NodePreprocess( p, pNode );
pNode->pNext = (Rwt_Node_t *)pGraph;
// assert( pNode->uTruth == (Dec_GraphDeriveTruth(pGraph) & 0xFFFF) );
}
}
/**Function*************************************************************
Synopsis [Preprocesses subgraphs rooted at this node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode )
{
Dec_Graph_t * pGraph;
Dec_Edge_t eRoot;
assert( !Rwt_IsComplement(pNode) );
// consider constant
if ( pNode->uTruth == 0 )
return Dec_GraphCreateConst0();
// consider the case of elementary var
if ( pNode->uTruth == 0x00FF )
return Dec_GraphCreateLeaf( 3, 4, 1 );
// start the subgraphs
pGraph = Dec_GraphCreate( 4 );
// collect the nodes
Rwt_ManIncTravId( p );
eRoot = Rwt_TravCollect_rec( p, pNode, pGraph );
Dec_GraphSetRoot( pGraph, eRoot );
return pGraph;
}
/**Function*************************************************************
Synopsis [Adds one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Dec_Edge_t Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph )
{
Dec_Edge_t eNode0, eNode1, eNode;
// elementary variable
if ( pNode->fUsed )
return Dec_EdgeCreate( pNode->Id - 1, 0 );
// previously visited node
if ( pNode->TravId == p->nTravIds )
return Dec_IntToEdge( pNode->Volume );
pNode->TravId = p->nTravIds;
// solve for children
eNode0 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p0), pGraph );
if ( Rwt_IsComplement(pNode->p0) )
eNode0.fCompl = !eNode0.fCompl;
eNode1 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p1), pGraph );
if ( Rwt_IsComplement(pNode->p1) )
eNode1.fCompl = !eNode1.fCompl;
// create the decomposition node(s)
if ( pNode->fExor )
eNode = Dec_GraphAddNodeXor( pGraph, eNode0, eNode1, 0 );
else
eNode = Dec_GraphAddNodeAnd( pGraph, eNode0, eNode1 );
// save the result
pNode->Volume = Dec_EdgeToInt( eNode );
return eNode;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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