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/**CFile****************************************************************
FileName [fraigTrans.c]
PackageName [MVSIS 1.3: Multi-valued logic synthesis system.]
Synopsis [Adds the additive and distributive choices to the AIG.]
Author [MVSIS Group]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - February 1, 2003.]
Revision [$Id: fraigTrans.c,v 1.1 2005/02/28 05:34:34 alanmi Exp $]
***********************************************************************/
#include "fraigInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Adds choice nodes based on associativity.]
Description [Make nLimit big AND gates and add all decompositions
to the Fraig.]
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_ManAddChoices( Fraig_Man_t * pMan, int fVerbose, int nLimit )
{
// ProgressBar * pProgress;
char Buffer[100];
int clkTotal = clock();
int i, nNodesBefore, nNodesAfter, nInputs, nMaxNodes;
int /*nMaxLevel,*/ nDistributive;
Fraig_Node_t *pNode, *pRepr;
Fraig_Node_t *pX, *pA, *pB, *pC, /* *pD,*/ *pN, /* *pQ, *pR,*/ *pT;
int fShortCut = 0;
nDistributive = 0;
// Fraig_ManSetApprox( pMan, 1 );
// NO functional reduction
if (fShortCut) Fraig_ManSetFuncRed( pMan, 0 );
// First we mark critical functions i.e. compute those
// nodes which lie on the critical path. Note that this
// doesn't update the required times on any choice nodes
// which are not the representatives
/*
nMaxLevel = Fraig_GetMaxLevel( pMan );
for ( i = 0; i < pMan->nOutputs; i++ )
{
Fraig_SetNodeRequired( pMan, pMan->pOutputs[i], nMaxLevel );
}
*/
nNodesBefore = Fraig_ManReadNodeNum( pMan );
nInputs = Fraig_ManReadInputNum( pMan );
nMaxNodes = nInputs + nLimit * ( nNodesBefore - nInputs );
printf ("Limit = %d, Before = %d\n", nMaxNodes, nNodesBefore );
if (0)
{
char buffer[128];
sprintf (buffer, "test" );
// Fraig_MappingShow( pMan, buffer );
}
// pProgress = Extra_ProgressBarStart( stdout, nMaxNodes );
Fraig_ManCheckConsistency( pMan );
for ( i = nInputs+1; (i < Fraig_ManReadNodeNum( pMan ))
&& (nMaxNodes > Fraig_ManReadNodeNum( pMan )); ++i )
{
// if ( i == nNodesBefore )
// break;
pNode = Fraig_ManReadIthNode( pMan, i );
assert ( pNode );
pRepr = pNode->pRepr ? pNode->pRepr : pNode;
//printf ("Slack: %d\n", Fraig_NodeReadSlack( pRepr ));
// All the new associative choices we add will have huge slack
// since we do not redo timing, and timing doesnt handle choices
// well anyway. However every newly added node is a choice of an
// existing critical node, so they are considered critical.
// if ( (Fraig_NodeReadSlack( pRepr ) > 3) && (i < nNodesBefore) )
// continue;
// if ( pNode->pRepr )
// continue;
// Try ((ab)c), x = ab -> (a(bc)) and (b(ac))
pX = Fraig_NodeReadOne(pNode);
pC = Fraig_NodeReadTwo(pNode);
if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX))
{
pA = Fraig_NodeReadOne(Fraig_Regular(pX));
pB = Fraig_NodeReadTwo(Fraig_Regular(pX));
// pA = Fraig_NodeGetRepr( pA );
// pB = Fraig_NodeGetRepr( pB );
// pC = Fraig_NodeGetRepr( pC );
if (fShortCut)
{
pT = Fraig_NodeAnd(pMan, pB, pC);
if ( !pT->pRepr )
{
pN = Fraig_NodeAnd(pMan, pA, pT);
// Fraig_NodeAddChoice( pMan, pNode, pN );
}
}
else
pN = Fraig_NodeAnd(pMan, pA, Fraig_NodeAnd(pMan, pB, pC));
// assert ( Fraig_NodesEqual(pN, pNode) );
if (fShortCut)
{
pT = Fraig_NodeAnd(pMan, pA, pC);
if ( !pT->pRepr )
{
pN = Fraig_NodeAnd(pMan, pB, pT);
// Fraig_NodeAddChoice( pMan, pNode, pN );
}
}
else
pN = Fraig_NodeAnd(pMan, pB, Fraig_NodeAnd(pMan, pA, pC));
// assert ( Fraig_NodesEqual(pN, pNode) );
}
// Try (a(bc)), x = bc -> ((ab)c) and ((ac)b)
pA = Fraig_NodeReadOne(pNode);
pX = Fraig_NodeReadTwo(pNode);
if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX))
{
pB = Fraig_NodeReadOne(Fraig_Regular(pX));
pC = Fraig_NodeReadTwo(Fraig_Regular(pX));
// pA = Fraig_NodeGetRepr( pA );
// pB = Fraig_NodeGetRepr( pB );
// pC = Fraig_NodeGetRepr( pC );
if (fShortCut)
{
pT = Fraig_NodeAnd(pMan, pA, pB);
if ( !pT->pRepr )
{
pN = Fraig_NodeAnd(pMan, pC, pT);
// Fraig_NodeAddChoice( pMan, pNode, pN );
}
}
else
pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pB), pC);
// assert ( Fraig_NodesEqual(pN, pNode) );
if (fShortCut)
{
pT = Fraig_NodeAnd(pMan, pA, pC);
if ( !pT->pRepr )
{
pN = Fraig_NodeAnd(pMan, pB, pT);
// Fraig_NodeAddChoice( pMan, pNode, pN );
}
}
else
pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pC), pB);
// assert ( Fraig_NodesEqual(pN, pNode) );
}
/*
// Try distributive transform
pQ = Fraig_NodeReadOne(pNode);
pR = Fraig_NodeReadTwo(pNode);
if ( (Fraig_IsComplement(pQ) && Fraig_NodeIsAnd(pQ))
&& (Fraig_IsComplement(pR) && Fraig_NodeIsAnd(pR)) )
{
pA = Fraig_NodeReadOne(Fraig_Regular(pQ));
pB = Fraig_NodeReadTwo(Fraig_Regular(pQ));
pC = Fraig_NodeReadOne(Fraig_Regular(pR));
pD = Fraig_NodeReadTwo(Fraig_Regular(pR));
// Now detect the !(xy + xz) pattern, store
// x in pA, y in pB and z in pC and set pD = 0 to indicate
// pattern was found
assert (pD != 0);
if (pA == pC) { pC = pD; pD = 0; }
if (pA == pD) { pD = 0; }
if (pB == pC) { pB = pA; pA = pC; pC = pD; pD = 0; }
if (pB == pD) { pB = pA; pA = pD; pD = 0; }
if (pD == 0)
{
nDistributive++;
pN = Fraig_Not(Fraig_NodeAnd(pMan, pA,
Fraig_NodeOr(pMan, pB, pC)));
if (fShortCut) Fraig_NodeAddChoice( pMan, pNode, pN );
// assert ( Fraig_NodesEqual(pN, pNode) );
}
}
*/
if ( i % 1000 == 0 )
{
sprintf( Buffer, "Adding choice %6d...", i - nNodesBefore );
// Extra_ProgressBarUpdate( pProgress, i, Buffer );
}
}
// Extra_ProgressBarStop( pProgress );
Fraig_ManCheckConsistency( pMan );
nNodesAfter = Fraig_ManReadNodeNum( pMan );
printf ( "Nodes before = %6d. Nodes with associative choices = %6d. Increase = %4.2f %%.\n",
nNodesBefore, nNodesAfter, ((float)(nNodesAfter - nNodesBefore)) * 100.0/(nNodesBefore - nInputs) );
printf ( "Distributive = %d\n", nDistributive );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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