mirror of https://github.com/YosysHQ/abc.git
163 lines
5.1 KiB
C
163 lines
5.1 KiB
C
/**CFile****************************************************************
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FileName [abcCollapse.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [Network and node package.]
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Synopsis [Collapsing the network into two-levels.]
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Author [Alan Mishchenko]
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Affiliation [UC Berkeley]
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Date [Ver. 1.0. Started - June 20, 2005.]
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Revision [$Id: abcCollapse.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include "abc.h"
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////////////////////////////////////////////////////////////////////////
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/// DECLARATIONS ///
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////////////////////////////////////////////////////////////////////////
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static Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk );
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static Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc );
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////////////////////////////////////////////////////////////////////////
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/// FUNCTION DEFINITIONS ///
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////////////////////////////////////////////////////////////////////////
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/**Function*************************************************************
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Synopsis [Collapses the network.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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Abc_Ntk_t * Abc_NtkCollapse( Abc_Ntk_t * pNtk, int fBddSizeMax, int fDualRail, int fReorder, int fVerbose )
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{
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Abc_Ntk_t * pNtkNew;
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int clk = clock();
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assert( Abc_NtkIsStrash(pNtk) );
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// compute the global BDDs
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if ( Abc_NtkBuildGlobalBdds(pNtk, fBddSizeMax, 1, fReorder, fVerbose) == NULL )
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return NULL;
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if ( fVerbose )
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{
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DdManager * dd = Abc_NtkGlobalBddMan( pNtk );
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printf( "The shared BDD size is %d nodes. ", Cudd_ReadKeys(dd) - Cudd_ReadDead(dd) );
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PRT( "BDD construction time", clock() - clk );
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}
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// create the new network
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pNtkNew = Abc_NtkFromGlobalBdds( pNtk );
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// Abc_NtkFreeGlobalBdds( pNtk );
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Abc_NtkFreeGlobalBdds( pNtk, 1 );
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if ( pNtkNew == NULL )
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{
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// Cudd_Quit( pNtk->pManGlob );
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// pNtk->pManGlob = NULL;
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return NULL;
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}
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// Extra_StopManager( pNtk->pManGlob );
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// pNtk->pManGlob = NULL;
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// make the network minimum base
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Abc_NtkMinimumBase( pNtkNew );
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if ( pNtk->pExdc )
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pNtkNew->pExdc = Abc_NtkDup( pNtk->pExdc );
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// make sure that everything is okay
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if ( !Abc_NtkCheck( pNtkNew ) )
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{
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printf( "Abc_NtkCollapse: The network check has failed.\n" );
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Abc_NtkDelete( pNtkNew );
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return NULL;
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}
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return pNtkNew;
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}
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/**Function*************************************************************
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Synopsis [Derives the network with the given global BDD.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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Abc_Ntk_t * Abc_NtkFromGlobalBdds( Abc_Ntk_t * pNtk )
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{
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ProgressBar * pProgress;
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Abc_Ntk_t * pNtkNew;
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Abc_Obj_t * pNode, * pDriver, * pNodeNew;
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// DdManager * dd = pNtk->pManGlob;
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DdManager * dd = Abc_NtkGlobalBddMan( pNtk );
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int i;
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// start the new network
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pNtkNew = Abc_NtkStartFrom( pNtk, ABC_NTK_LOGIC, ABC_FUNC_BDD );
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// make sure the new manager has the same number of inputs
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Cudd_bddIthVar( pNtkNew->pManFunc, dd->size-1 );
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// process the POs
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pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
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Abc_NtkForEachCo( pNtk, pNode, i )
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{
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Extra_ProgressBarUpdate( pProgress, i, NULL );
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pDriver = Abc_ObjFanin0(pNode);
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if ( Abc_ObjIsCi(pDriver) && !strcmp(Abc_ObjName(pNode), Abc_ObjName(pDriver)) )
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{
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Abc_ObjAddFanin( pNode->pCopy, pDriver->pCopy );
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continue;
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}
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// pNodeNew = Abc_NodeFromGlobalBdds( pNtkNew, dd, Vec_PtrEntry(pNtk->vFuncsGlob, i) );
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pNodeNew = Abc_NodeFromGlobalBdds( pNtkNew, dd, Abc_ObjGlobalBdd(pNode) );
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Abc_ObjAddFanin( pNode->pCopy, pNodeNew );
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}
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Extra_ProgressBarStop( pProgress );
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return pNtkNew;
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}
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/**Function*************************************************************
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Synopsis [Derives the network with the given global BDD.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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Abc_Obj_t * Abc_NodeFromGlobalBdds( Abc_Ntk_t * pNtkNew, DdManager * dd, DdNode * bFunc )
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{
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Abc_Obj_t * pNodeNew, * pTemp;
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int i;
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// create a new node
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pNodeNew = Abc_NtkCreateNode( pNtkNew );
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// add the fanins in the order, in which they appear in the reordered manager
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Abc_NtkForEachCi( pNtkNew, pTemp, i )
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Abc_ObjAddFanin( pNodeNew, Abc_NtkCi(pNtkNew, dd->invperm[i]) );
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// transfer the function
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pNodeNew->pData = Extra_TransferLevelByLevel( dd, pNtkNew->pManFunc, bFunc ); Cudd_Ref( pNodeNew->pData );
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return pNodeNew;
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}
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////////////////////////////////////////////////////////////////////////
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/// END OF FILE ///
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////////////////////////////////////////////////////////////////////////
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