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abc/src/opt/sfm/sfmTime.c

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/**CFile****************************************************************
FileName [sfmTime.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based optimization using internal don't-cares.]
Synopsis [Timing manager.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: sfmTime.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sfmInt.h"
#include "misc/st/st.h"
#include "map/mio/mio.h"
#include "base/abc/abc.h"
#include "misc/util/utilNam.h"
#include "map/scl/sclCon.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct Sfm_Tim_t_ Sfm_Tim_t;
struct Sfm_Tim_t_
{
// external
Mio_Library_t * pLib; // library
Scl_Con_t * pExt; // external timing
Abc_Ntk_t * pNtk; // mapped network
int Delay; // the largest delay
// timing info
Vec_Int_t vTimArrs; // arrivals (rise/fall)
Vec_Int_t vTimReqs; // required (rise/fall)
Vec_Int_t vTimSlews; // slews (rise/fall)
Vec_Int_t vTimLoads; // loads (rise/fall)
// timing edges
Vec_Int_t vObjOffs; // object offsets
Vec_Int_t vTimEdges; // edge timings (rise/fall)
// critical path
Vec_Int_t vPath; // critical path
};
static inline int * Sfm_TimArr( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { return Vec_IntEntryP( &p->vTimArrs, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
static inline int * Sfm_TimReq( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { return Vec_IntEntryP( &p->vTimReqs, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
static inline int * Sfm_TimSlew( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { return Vec_IntEntryP( &p->vTimSlews, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
static inline int * Sfm_TimLoad( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { return Vec_IntEntryP( &p->vTimLoads, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
static inline int Sfm_TimArrMax( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { int * a = Sfm_TimArr(p, pNode); return Abc_MaxInt(a[0], a[1]); }
static inline void Sfm_TimSetReq( Sfm_Tim_t * p, Abc_Obj_t * pNode, int t ) { int * r = Sfm_TimReq(p, pNode); r[0] = r[1] = t; }
static inline int Sfm_TimSlack( Sfm_Tim_t * p, Abc_Obj_t * pNode ) { int * r = Sfm_TimReq(p, pNode), * a = Sfm_TimArr(p, pNode); return Abc_MinInt(r[0]-a[0], r[1]-a[1]); }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_TimEdgeArrival( Sfm_Tim_t * p, Abc_Obj_t * pNode, int iEdge, Mio_Pin_t * pPin )
{
Mio_PinPhase_t PinPhase = Mio_PinReadPhase(pPin);
int tDelayBlockRise = (int)(MIO_NUM*Mio_PinReadDelayBlockRise(pPin));
int tDelayBlockFall = (int)(MIO_NUM*Mio_PinReadDelayBlockFall(pPin));
int * pTimeOut = Sfm_TimArr(p, pNode);
int * pTimeIn = Sfm_TimArr(p, Abc_ObjFanin(pNode, iEdge));
if ( PinPhase != MIO_PHASE_INV ) // NONINV phase is present
{
pTimeOut[0] = Abc_MaxInt( pTimeOut[0], pTimeIn[0] + tDelayBlockRise );
pTimeOut[1] = Abc_MaxInt( pTimeOut[1], pTimeIn[1] + tDelayBlockFall );
}
if ( PinPhase != MIO_PHASE_NONINV ) // INV phase is present
{
pTimeOut[0] = Abc_MaxInt( pTimeOut[0], pTimeIn[1] + tDelayBlockRise );
pTimeOut[1] = Abc_MaxInt( pTimeOut[1], pTimeIn[0] + tDelayBlockFall );
}
}
void Sfm_TimGateArrival( Sfm_Tim_t * p, Abc_Obj_t * pNode )
{
Mio_Gate_t * pGate = (Mio_Gate_t *)pNode->pData;
Mio_Pin_t * pPin; int i = 0;
Mio_GateForEachPin( pGate, pPin )
Sfm_TimEdgeArrival( p, pNode, i++, pPin );
assert( i == Mio_GateReadPinNum(pGate) );
}
void Sfm_TimEdgeRequired( Sfm_Tim_t * p, Abc_Obj_t * pNode, int iEdge, Mio_Pin_t * pPin )
{
Mio_PinPhase_t PinPhase = Mio_PinReadPhase(pPin);
int tDelayBlockRise = (int)(MIO_NUM*Mio_PinReadDelayBlockRise(pPin));
int tDelayBlockFall = (int)(MIO_NUM*Mio_PinReadDelayBlockFall(pPin));
int * pTimeOut = Sfm_TimReq(p, pNode);
int * pTimeIn = Sfm_TimReq(p, Abc_ObjFanin(pNode, iEdge));
if ( PinPhase != MIO_PHASE_INV ) // NONINV phase is present
{
pTimeIn[0] = Abc_MinInt( pTimeIn[0], pTimeOut[0] - tDelayBlockRise );
pTimeIn[1] = Abc_MinInt( pTimeIn[1], pTimeOut[1] - tDelayBlockFall );
}
if ( PinPhase != MIO_PHASE_NONINV ) // INV phase is present
{
pTimeIn[0] = Abc_MinInt( pTimeIn[0], pTimeOut[1] - tDelayBlockRise );
pTimeIn[1] = Abc_MinInt( pTimeIn[1], pTimeOut[0] - tDelayBlockFall );
}
}
void Sfm_TimGateRequired( Sfm_Tim_t * p, Abc_Obj_t * pNode )
{
Mio_Gate_t * pGate = (Mio_Gate_t *)pNode->pData;
Mio_Pin_t * pPin; int i = 0;
Mio_GateForEachPin( pGate, pPin )
Sfm_TimEdgeRequired( p, pNode, i++, pPin );
assert( i == Mio_GateReadPinNum(pGate) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_TimCriticalPath_int( Sfm_Tim_t * p, Abc_Obj_t * pObj, Vec_Int_t * vPath, int SlackMax )
{
Abc_Obj_t * pNext; int i;
if ( Abc_NodeIsTravIdCurrent( pObj ) )
return;
Abc_NodeSetTravIdCurrent( pObj );
assert( Abc_ObjIsNode(pObj) );
Abc_ObjForEachFanin( pObj, pNext, i )
{
if ( Abc_ObjIsCi(pNext) || Abc_ObjFaninNum(pNext) == 0 )
continue;
assert( Abc_ObjIsNode(pNext) );
if ( Sfm_TimSlack(p, pNext) <= SlackMax )
Sfm_TimCriticalPath_int( p, pNext, vPath, SlackMax );
}
if ( Abc_ObjFaninNum(pObj) > 0 )
Vec_IntPush( vPath, Abc_ObjId(pObj) );
}
int Sfm_TimCriticalPath( Sfm_Tim_t * p, int Window )
{
int i, SlackMax = p->Delay * Window / 100;
Abc_Obj_t * pObj, * pNext;
Vec_IntClear( &p->vPath );
Abc_NtkIncrementTravId( p->pNtk );
Abc_NtkForEachCo( p->pNtk, pObj, i )
{
pNext = Abc_ObjFanin0(pObj);
if ( Abc_ObjIsCi(pNext) || Abc_ObjFaninNum(pNext) == 0 )
continue;
assert( Abc_ObjIsNode(pNext) );
if ( Sfm_TimSlack(p, pNext) <= SlackMax )
Sfm_TimCriticalPath_int( p, pNext, &p->vPath, SlackMax );
}
return Vec_IntSize(&p->vPath);
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sfm_TimTrace( Sfm_Tim_t * p )
{
Abc_Obj_t * pObj; int i, Delay = 0;
Vec_Ptr_t * vNodes = Abc_NtkDfs( p->pNtk, 1 );
Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
Sfm_TimGateArrival( p, pObj );
Abc_NtkForEachCo( p->pNtk, pObj, i )
Delay = Abc_MaxInt( Delay, Sfm_TimArrMax(p, Abc_ObjFanin0(pObj)) );
Abc_NtkForEachCo( p->pNtk, pObj, i )
Sfm_TimSetReq( p, Abc_ObjFanin0(pObj), Delay );
Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pObj, i )
Sfm_TimGateRequired( p, pObj );
Vec_PtrFree( vNodes );
return Delay;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Sfm_Tim_t * Sfm_TimStart( Mio_Library_t * pLib, Scl_Con_t * pExt, Abc_Ntk_t * pNtk )
{
// Abc_Obj_t * pObj; int i;
Sfm_Tim_t * p = ABC_CALLOC( Sfm_Tim_t, 1 );
p->pLib = pLib;
p->pExt = pExt;
p->pNtk = pNtk;
Vec_IntFill( &p->vTimArrs, 2*Abc_NtkObjNumMax(pNtk), 0 );
Vec_IntFill( &p->vTimReqs, 2*Abc_NtkObjNumMax(pNtk), 0 );
// Vec_IntFill( &p->vTimSlews, 2*Abc_NtkObjNumMax(pNtk), 0 );
// Vec_IntFill( &p->vTimLoads, 2*Abc_NtkObjNumMax(pNtk), 0 );
// Vec_IntFill( &p->vObjOffs, Abc_NtkObjNumMax(pNtk), 0 );
// Abc_NtkForEachNode( pNtk, pObj, i )
// {
// Vec_IntWriteEntry( &p->vObjOffs, i, Vec_IntSize(Vec_IntSize(&p->vTimEdges)) );
// Vec_IntFillExtra( &p->vTimEdges, Vec_IntSize(Vec_IntSize(&p->vTimEdges)) + Abc_ObjFaninNum(pObj), 0 );
// }
return p;
}
void Sfm_TimStop( Sfm_Tim_t * p )
{
Vec_IntErase( &p->vTimArrs );
Vec_IntErase( &p->vTimReqs );
Vec_IntErase( &p->vTimSlews );
Vec_IntErase( &p->vTimLoads );
Vec_IntErase( &p->vObjOffs );
Vec_IntErase( &p->vTimEdges );
Vec_IntErase( &p->vPath );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_TimTest( Abc_Ntk_t * pNtk )
{
Mio_Library_t * pLib = (Mio_Library_t *)pNtk->pManFunc;
Sfm_Tim_t * p = Sfm_TimStart( pLib, NULL, pNtk );
p->Delay = Sfm_TimTrace( p );
printf( "Max delay = %.2f. Path = %d (%d).\n", MIO_NUMINV*p->Delay, Sfm_TimCriticalPath(p, 1), Abc_NtkNodeNum(p->pNtk) );
Sfm_TimStop( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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