/**Function*************************************************************
Synopsis [Performs incremental rewriting of the AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_ManRewritePre( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost, int fVerbose )
{
Rwt_Man_t * pManRwt;
Ivy_Obj_t * pNode;
int i, nNodes, nGain;
int clk, clkStart = clock();
// start the rewriting manager
pManRwt = Rwt_ManStart( 0 );
p->pData = pManRwt;
if ( pManRwt == NULL )
return 0;
// create fanouts
if ( fUpdateLevel && p->fFanout == 0 )
Ivy_ManStartFanout( p );
// compute the reverse levels if level update is requested
if ( fUpdateLevel )
Ivy_ManRequiredLevels( p );
// set the number of levels
// p->nLevelMax = Ivy_ManLevels( p );
// resynthesize each node once
nNodes = Ivy_ManObjIdMax(p);
Ivy_ManForEachNode( p, pNode, i )
{
// fix the fanin buffer problem
Ivy_NodeFixBufferFanins( p, pNode, 1 );
if ( Ivy_ObjIsBuf(pNode) )
continue;
// stop if all nodes have been tried once
if ( i > nNodes )
break;
// for each cut, try to resynthesize it
nGain = Ivy_NodeRewrite( p, pManRwt, pNode, fUpdateLevel, fUseZeroCost );
if ( nGain > 0 || (nGain == 0 && fUseZeroCost) )
{
Dec_Graph_t * pGraph = (Dec_Graph_t *)Rwt_ManReadDecs(pManRwt);
int fCompl = Rwt_ManReadCompl(pManRwt);
/*
{
Ivy_Obj_t * pObj;
int i;
printf( "USING: (" );
Vec_PtrForEachEntry( Ivy_Obj_t *, Rwt_ManReadLeaves(pManRwt), pObj, i )
printf( "%d ", Ivy_ObjFanoutNum(Ivy_Regular(pObj)) );
printf( ") Gain = %d.\n", nGain );
}
if ( nGain > 0 )
{ // print stats on the MFFC
extern void Ivy_NodeMffcConeSuppPrint( Ivy_Obj_t * pNode );
printf( "Node %6d : Gain = %4d ", pNode->Id, nGain );
Ivy_NodeMffcConeSuppPrint( pNode );
}
*/
// complement the FF if needed
clk = clock();
if ( fCompl ) Dec_GraphComplement( pGraph );
Ivy_GraphUpdateNetwork( p, pNode, pGraph, fUpdateLevel, nGain );
if ( fCompl ) Dec_GraphComplement( pGraph );
Rwt_ManAddTimeUpdate( pManRwt, clock() - clk );
}
}
/**Function*************************************************************
Synopsis [Performs incremental rewriting of the AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_ManRewriteSeq( Ivy_Man_t * p, int fUseZeroCost, int fVerbose )
{
Rwt_Man_t * pManRwt;
Ivy_Obj_t * pNode;
int i, nNodes, nGain;
abctime clk, clkStart = Abc_Clock();
// set the DC latch values
Ivy_ManForEachLatch( p, pNode, i )
pNode->Init = IVY_INIT_DC;
// start the rewriting manager
pManRwt = Rwt_ManStart( 0 );
p->pData = pManRwt;
if ( pManRwt == NULL )
return 0;
// create fanouts
if ( p->fFanout == 0 )
Ivy_ManStartFanout( p );
// resynthesize each node once
nNodes = Ivy_ManObjIdMax(p);
Ivy_ManForEachNode( p, pNode, i )
{
assert( !Ivy_ObjIsBuf(pNode) );
assert( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) );
assert( !Ivy_ObjIsBuf(Ivy_ObjFanin1(pNode)) );
// fix the fanin buffer problem
// Ivy_NodeFixBufferFanins( p, pNode );
// if ( Ivy_ObjIsBuf(pNode) )
// continue;
// stop if all nodes have been tried once
if ( i > nNodes )
break;
// for each cut, try to resynthesize it
nGain = Ivy_NodeRewriteSeq( p, pManRwt, pNode, fUseZeroCost );
if ( nGain > 0 || (nGain == 0 && fUseZeroCost) )
{
Dec_Graph_t * pGraph = (Dec_Graph_t *)Rwt_ManReadDecs(pManRwt);
int fCompl = Rwt_ManReadCompl(pManRwt);
// complement the FF if needed
clk = Abc_Clock();
if ( fCompl ) Dec_GraphComplement( pGraph );
Ivy_GraphUpdateNetworkSeq( p, pNode, pGraph, nGain );
if ( fCompl ) Dec_GraphComplement( pGraph );
Rwt_ManAddTimeUpdate( pManRwt, Abc_Clock() - clk );
}
}