mirror of https://github.com/YosysHQ/abc.git
198 lines
6.3 KiB
C
198 lines
6.3 KiB
C
/**CFile****************************************************************
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FileName [sbdPath.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [SAT-based optimization using internal don't-cares.]
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Synopsis [Critical path.]
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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: sbdPath.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include "sbdInt.h"
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#include "misc/tim/tim.h"
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ABC_NAMESPACE_IMPL_START
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////////////////////////////////////////////////////////////////////////
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/// DECLARATIONS ///
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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/// FUNCTION DEFINITIONS ///
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////////////////////////////////////////////////////////////////////////
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/**Function*************************************************************
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Synopsis []
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int Sbc_ManAddInternalToPath_rec( Gia_Man_t * p, int iObj, Vec_Bit_t * vPath )
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{
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Gia_Obj_t * pObj;
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int k, iFan, Value = 0;
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if ( Gia_ObjIsTravIdCurrentId(p, iObj) )
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return Vec_BitEntry(vPath, iObj);
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Gia_ObjSetTravIdCurrentId(p, iObj);
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pObj = Gia_ManObj( p, iObj );
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if ( Gia_ObjIsCi(pObj) )
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return Vec_BitEntry(vPath, iObj);
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assert( Gia_ObjIsAnd(pObj) );
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Gia_LutForEachFanin( p, iObj, iFan, k )
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Value |= Sbc_ManAddInternalToPath_rec( p, iFan, vPath );
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if ( Value )
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Vec_BitWriteEntry( vPath, iObj, 1 );
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return Value;
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}
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void Sbc_ManAddInternalToPath( Gia_Man_t * p, Vec_Bit_t * vPath )
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{
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int k, iFan, iObj;
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Gia_ManForEachLut( p, iObj )
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{
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if ( !Vec_BitEntry(vPath, iObj) )
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continue;
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Gia_ManIncrementTravId( p );
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Gia_LutForEachFanin( p, iObj, iFan, k )
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Gia_ObjSetTravIdCurrentId(p, iFan);
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Sbc_ManAddInternalToPath_rec( p, iObj, vPath );
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}
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}
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/**Function*************************************************************
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Synopsis []
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Sbc_ManCriticalPath_rec( Gia_Man_t * p, int * pLevels, int iObj, int LevelFan, Vec_Bit_t * vPath, int Slack )
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{
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Gia_Obj_t * pObj; int k, iFan;
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if ( Gia_ObjIsTravIdCurrentId(p, iObj) )
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return;
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Gia_ObjSetTravIdCurrentId(p, iObj);
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pObj = Gia_ManObj( p, iObj );
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Vec_BitWriteEntry( vPath, iObj, 1 );
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if ( Gia_ObjIsCi(pObj) )
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{
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Tim_Man_t * pManTime = (Tim_Man_t *)p->pManTime;
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int iBox = pManTime ? Tim_ManBoxForCi( pManTime, Gia_ObjCioId(pObj) ) : -1;
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if ( iBox >= 0 )
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{
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int curCo = Tim_ManBoxInputFirst( pManTime, iBox );
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int nBoxInputs = Tim_ManBoxInputNum( pManTime, iBox );
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for ( k = 0; k < nBoxInputs; k++ )
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{
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Gia_Obj_t * pCo = Gia_ManCo( p, curCo + k );
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int iDriver = Gia_ObjFaninId0p( p, pCo );
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if ( (pLevels[iDriver]+Slack >= LevelFan-1) && iDriver )
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Sbc_ManCriticalPath_rec( p, pLevels, iDriver, pLevels[iDriver], vPath, Abc_MaxInt(0, pLevels[iDriver]+Slack-(LevelFan-1)) );
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}
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}
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return;
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}
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assert( Gia_ObjIsAnd(pObj) );
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Gia_LutForEachFanin( p, iObj, iFan, k )
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if ( pLevels[iFan]+Slack >= LevelFan-1 )
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Sbc_ManCriticalPath_rec( p, pLevels, iFan, pLevels[iFan], vPath, Abc_MaxInt(0, pLevels[iFan]+Slack-(LevelFan-1)) );
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}
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Vec_Bit_t * Sbc_ManCriticalPath( Gia_Man_t * p )
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{
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int * pLevels = NULL, k, iDriver, Slack = 1;
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int nLevels = p->pManTime ? Gia_ManLutLevelWithBoxes(p) : Gia_ManLutLevel(p, &pLevels);
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Vec_Bit_t * vPath = Vec_BitStart( Gia_ManObjNum(p) );
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if ( p->pManTime )
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pLevels = Vec_IntArray( p->vLevels );
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Gia_ManIncrementTravId( p );
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Gia_ManForEachCoDriverId( p, iDriver, k )
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if ( (pLevels[iDriver] == nLevels) && iDriver )
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Sbc_ManCriticalPath_rec( p, pLevels, iDriver, pLevels[iDriver], vPath, Slack );
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if ( !p->pManTime )
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ABC_FREE( pLevels );
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Sbc_ManAddInternalToPath( p, vPath );
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return vPath;
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}
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/**Function*************************************************************
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Synopsis []
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Sbc_ManDelayTrace( Gia_Man_t * p )
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{
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Vec_Bit_t * vPath = Vec_BitStart( Gia_ManObjNum(p) );
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int i, k, iFan, nLevels, * pLevels;
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int nLuts = 0, nNodes = 0, nEdges = 0, nEdgesAll = 0;
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if ( !Gia_ManHasMapping(p) )
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{
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printf( "No mapping is available.\n" );
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return;
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}
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assert( Gia_ManHasMapping(p) );
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// set critical CO drivers
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nLevels = Gia_ManLutLevel( p, &pLevels );
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Gia_ManForEachCoDriverId( p, iFan, i )
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if ( pLevels[iFan] == nLevels )
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Vec_BitWriteEntry( vPath, iFan, 1 );
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// set critical internal nodes
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Gia_ManForEachLutReverse( p, i )
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{
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nLuts++;
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if ( !Vec_BitEntry(vPath, i) )
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continue;
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nNodes++;
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Gia_LutForEachFanin( p, i, iFan, k )
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{
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if ( pLevels[iFan] +1 < pLevels[i] )
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continue;
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assert( pLevels[iFan] + 1 == pLevels[i] );
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Vec_BitWriteEntry( vPath, iFan, 1 );
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nEdges++;
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//printf( "%d -> %d\n", i, iFan );
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}
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}
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Gia_ManForEachLut( p, i )
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Gia_LutForEachFanin( p, i, iFan, k )
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nEdgesAll += (Vec_BitEntry(vPath, i) && Vec_BitEntry(vPath, iFan));
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ABC_FREE( pLevels );
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Vec_BitFree( vPath );
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printf( "AIG = %d. LUT = %d. Lev = %d. Path nodes = %d. Path edges = %d. (%d.)\n",
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Gia_ManAndNum(p), nLuts, nLevels, nNodes, nEdges, nEdgesAll );
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}
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////////////////////////////////////////////////////////////////////////
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/// END OF FILE ///
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////////////////////////////////////////////////////////////////////////
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ABC_NAMESPACE_IMPL_END
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