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/**CFile****************************************************************
FileName [sclSize.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Standard-cell library representation.]
Synopsis [Core timing analysis used in gate-sizing.]
Author [Alan Mishchenko, Niklas Een]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - August 24, 2012.]
Revision [$Id: sclSize.c,v 1.0 2012/08/24 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sclSize.h"
#include "map/mio/mio.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Finding most critical objects.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_SclFindCriticalCo( SC_Man * p, int * pfRise )
{
Abc_Obj_t * pObj, * pPivot = NULL;
float fMaxArr = 0;
int i;
Abc_NtkForEachCo( p->pNtk, pObj, i )
{
SC_Pair * pArr = Abc_SclObjTime( p, pObj );
if ( fMaxArr < pArr->rise ) fMaxArr = pArr->rise, *pfRise = 1, pPivot = pObj;
if ( fMaxArr < pArr->fall ) fMaxArr = pArr->fall, *pfRise = 0, pPivot = pObj;
}
assert( pPivot != NULL );
return pPivot;
}
// assumes that slacks are not available (uses arrival times)
Abc_Obj_t * Abc_SclFindMostCriticalFanin2( SC_Man * p, int * pfRise, Abc_Obj_t * pNode )
{
Abc_Obj_t * pFanin, * pPivot = NULL;
float fMaxArr = 0;
int i;
Abc_ObjForEachFanin( pNode, pFanin, i )
{
SC_Pair * pArr = Abc_SclObjTime( p, pFanin );
if ( fMaxArr < pArr->rise ) fMaxArr = pArr->rise, *pfRise = 1, pPivot = pFanin;
if ( fMaxArr < pArr->fall ) fMaxArr = pArr->fall, *pfRise = 0, pPivot = pFanin;
}
return pPivot;
}
// assumes that slack are available
Abc_Obj_t * Abc_SclFindMostCriticalFanin( SC_Man * p, int * pfRise, Abc_Obj_t * pNode )
{
Abc_Obj_t * pFanin, * pPivot = NULL;
float fMinSlack = ABC_INFINITY;
SC_Pair * pArr;
int i;
*pfRise = 0;
// find min-slack node
Abc_ObjForEachFanin( pNode, pFanin, i )
if ( fMinSlack > Abc_SclObjSlack( p, pFanin ) )
{
fMinSlack = Abc_SclObjSlack( p, pFanin );
pPivot = pFanin;
}
if ( pPivot == NULL )
return NULL;
// find its leading phase
pArr = Abc_SclObjTime( p, pPivot );
*pfRise = (pArr->rise >= pArr->fall);
return pPivot;
}
/**Function*************************************************************
Synopsis [Printing timing information for the node/network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Abc_SclTimeNodePrint( SC_Man * p, Abc_Obj_t * pObj, int fRise, int Length, float maxDelay )
{
SC_Cell * pCell = Abc_ObjIsNode(pObj) ? Abc_SclObjCell(p, pObj) : NULL;
printf( "%6d : ", Abc_ObjId(pObj) );
printf( "%d ", Abc_ObjFaninNum(pObj) );
printf( "%2d ", Abc_ObjFanoutNum(pObj) );
printf( "%-*s ", Length, pCell ? pCell->pName : "pi" );
printf( "A =%7.2f ", pCell ? pCell->area : 0.0 );
printf( "D%s =", fRise ? "r" : "f" );
printf( "%5.0f ", Abc_MaxFloat(Abc_SclObjTimePs(p, pObj, 0), Abc_SclObjTimePs(p, pObj, 1)) );
printf( "%4.0f ps ", -Abc_AbsFloat(Abc_SclObjTimePs(p, pObj, 0) - Abc_SclObjTimePs(p, pObj, 1)) );
printf( "S =%5.0f ps ", Abc_SclObjSlewPs(p, pObj, fRise >= 0 ? fRise : 0 ) );
printf( "Cin =%4.0f ff ", pCell ? Abc_SclGatePinCapAve(p->pLib, pCell) : 0.0 );
printf( "Cout =%5.0f ff ", Abc_SclObjLoadFf(p, pObj, fRise >= 0 ? fRise : 0 ) );
printf( "Cmax =%5.0f ff ", pCell ? SC_CellPin(pCell, pCell->n_inputs)->max_out_cap : 0.0 );
printf( "G =%4.1f ", pCell ? Abc_SclObjLoadAve(p, pObj) / SC_CellPinCap(pCell, 0) : 0.0 );
printf( "SL =%5.1f ps", Abc_SclObjSlack(p, pObj) );
printf( "\n" );
}
void Abc_SclTimeNtkPrint( SC_Man * p, int fShowAll, int fPrintPath )
{
int i, nLength = 0, fRise = 0;
Abc_Obj_t * pObj, * pPivot = Abc_SclFindCriticalCo( p, &fRise );
float maxDelay = Abc_SclObjTimePs(p, pPivot, fRise);
p->ReportDelay = maxDelay;
printf( "WireLoad model = \"%s\". ", p->pWLoadUsed ? p->pWLoadUsed->pName : "none" );
printf( "Gates = %6d. ", Abc_NtkNodeNum(p->pNtk) );
printf( "Area = %12.2f. ", Abc_SclGetTotalArea( p ) );
printf( "Critical delay = %8.2f ps\n", maxDelay );
if ( !fPrintPath )
return;
if ( fShowAll )
{
// printf( "Timing information for all nodes: \n" );
// find the longest cell name
Abc_NtkForEachNodeReverse( p->pNtk, pObj, i )
if ( Abc_ObjFaninNum(pObj) > 0 )
nLength = Abc_MaxInt( nLength, strlen(Abc_SclObjCell(p, pObj)->pName) );
// print timing
Abc_NtkForEachNodeReverse( p->pNtk, pObj, i )
if ( Abc_ObjFaninNum(pObj) > 0 )
Abc_SclTimeNodePrint( p, pObj, -1, nLength, maxDelay );
}
else
{
// printf( "Critical path: \n" );
// find the longest cell name
pObj = Abc_ObjFanin0(pPivot);
i = 0;
while ( pObj && Abc_ObjIsNode(pObj) )
{
i++;
nLength = Abc_MaxInt( nLength, strlen(Abc_SclObjCell(p, pObj)->pName) );
pObj = Abc_SclFindMostCriticalFanin( p, &fRise, pObj );
}
// print timing
pObj = Abc_ObjFanin0(pPivot);
while ( pObj )//&& Abc_ObjIsNode(pObj) )
{
printf( "Path%3d -- ", i-- );
Abc_SclTimeNodePrint( p, pObj, fRise, nLength, maxDelay );
pObj = Abc_SclFindMostCriticalFanin( p, &fRise, pObj );
}
}
}
/**Function*************************************************************
Synopsis [Timing computation for pin/gate/cone/network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Abc_SclTimeFanin( SC_Man * p, SC_Timing * pTime, Abc_Obj_t * pObj, Abc_Obj_t * pFanin )
{
SC_Pair * pArrIn = Abc_SclObjTime( p, pFanin );
SC_Pair * pSlewIn = Abc_SclObjSlew( p, pFanin );
SC_Pair * pLoad = Abc_SclObjLoad( p, pObj );
SC_Pair * pArrOut = Abc_SclObjTime( p, pObj ); // modified
SC_Pair * pSlewOut = Abc_SclObjSlew( p, pObj ); // modified
Scl_LibPinArrival( pTime, pArrIn, pSlewIn, pLoad, pArrOut, pSlewOut );
}
static inline void Abc_SclDeptFanin( SC_Man * p, SC_Timing * pTime, Abc_Obj_t * pObj, Abc_Obj_t * pFanin )
{
SC_Pair * pDepIn = Abc_SclObjDept( p, pFanin ); // modified
SC_Pair * pSlewIn = Abc_SclObjSlew( p, pFanin );
SC_Pair * pLoad = Abc_SclObjLoad( p, pObj );
SC_Pair * pDepOut = Abc_SclObjDept( p, pObj );
Scl_LibPinDeparture( pTime, pDepIn, pSlewIn, pLoad, pDepOut );
}
void Abc_SclTimeNode( SC_Man * p, Abc_Obj_t * pObj, int fDept )
{
SC_Timings * pRTime;
SC_Timing * pTime;
SC_Pin * pPin;
SC_Cell * pCell;
int k;
if ( Abc_ObjIsCo(pObj) )
{
if ( !fDept )
Abc_SclObjDupFanin( p, pObj );
return;
}
assert( Abc_ObjIsNode(pObj) );
// get the library cell
pCell = Abc_SclObjCell( p, pObj );
// get the output pin
// assert( pCell->n_outputs == 1 );
pPin = SC_CellPin( pCell, pCell->n_inputs );
// compute timing using each fanin
assert( Vec_PtrSize(pPin->vRTimings) == pCell->n_inputs );
SC_PinForEachRTiming( pPin, pRTime, k )
{
assert( Vec_PtrSize(pRTime->vTimings) == 1 );
pTime = (SC_Timing *)Vec_PtrEntry( pRTime->vTimings, 0 );
if ( fDept )
Abc_SclDeptFanin( p, pTime, pObj, Abc_ObjFanin(pObj, k) );
else
Abc_SclTimeFanin( p, pTime, pObj, Abc_ObjFanin(pObj, k) );
}
}
void Abc_SclTimeCone( SC_Man * p, Vec_Int_t * vCone )
{
int fVerbose = 0;
Abc_Obj_t * pObj;
int i;
Abc_SclConeClear( p, vCone );
Abc_NtkForEachObjVec( vCone, p->pNtk, pObj, i )
{
if ( fVerbose && Abc_ObjIsNode(pObj) )
printf( " Updating node %d with gate %s\n", Abc_ObjId(pObj), Abc_SclObjCell(p, pObj)->pName );
if ( fVerbose && Abc_ObjIsNode(pObj) )
printf( " before (%6.1f ps %6.1f ps) ", Abc_SclObjTimePs(p, pObj, 1), Abc_SclObjTimePs(p, pObj, 0) );
Abc_SclTimeNode( p, pObj, 0 );
if ( fVerbose && Abc_ObjIsNode(pObj) )
printf( "after (%6.1f ps %6.1f ps)\n", Abc_SclObjTimePs(p, pObj, 1), Abc_SclObjTimePs(p, pObj, 0) );
}
}
void Abc_SclTimeNtkRecompute( SC_Man * p, float * pArea, float * pDelay, int fReverse, float DUser )
{
Abc_Obj_t * pObj;
float D;
int i;
Abc_SclComputeLoad( p );
Abc_SclManCleanTime( p );
Abc_NtkForEachNode1( p->pNtk, pObj, i )
Abc_SclTimeNode( p, pObj, 0 );
Abc_NtkForEachCo( p->pNtk, pObj, i )
{
Abc_SclObjDupFanin( p, pObj );
Vec_FltWriteEntry( p->vTimesOut, i, Abc_SclObjTimeMax(p, pObj) );
Vec_QueUpdate( p->vQue, i );
}
D = Abc_SclReadMaxDelay( p );
if ( fReverse && DUser > 0 && D < DUser )
D = DUser;
if ( pArea )
*pArea = Abc_SclGetTotalArea( p );
if ( pDelay )
*pDelay = D;
if ( fReverse )
{
Abc_NtkForEachNodeReverse1( p->pNtk, pObj, i )
Abc_SclTimeNode( p, pObj, 1 );
Abc_NtkForEachObj( p->pNtk, pObj, i )
p->pSlack[i] = Abc_MaxFloat( 0.0, Abc_SclObjGetSlack(p, pObj, D) );
}
}
/**Function*************************************************************
Synopsis [Read input slew and output load.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_SclManReadSlewAndLoad( SC_Man * p, Abc_Ntk_t * pNtk )
{
Abc_Time_t * pTime;
Abc_Obj_t * pObj;
int i;
if ( pNtk->pManTime == NULL )
return;
// read input slew
pTime = Abc_NtkReadDefaultInputDrive( pNtk );
if ( Abc_MaxFloat(pTime->Rise, pTime->Fall) != 0 )
{
printf( "Default input slew is specified (%.2f ps; %.2f ps).\n", pTime->Rise, pTime->Fall );
Abc_NtkForEachPi( pNtk, pObj, i )
{
SC_Pair * pSlew = Abc_SclObjSlew( p, pObj );
pSlew->rise = SC_LibTimeFromPs( p->pLib, pTime->Rise );
pSlew->fall = SC_LibTimeFromPs( p->pLib, pTime->Fall );
}
}
if ( Abc_NodeReadInputDrive(pNtk, 0) != NULL )
{
printf( "Input slews for some primary inputs are specified.\n" );
Abc_NtkForEachPi( pNtk, pObj, i )
{
SC_Pair * pSlew = Abc_SclObjSlew( p, pObj );
pTime = Abc_NodeReadInputDrive(pNtk, i);
pSlew->rise = SC_LibTimeFromPs( p->pLib, pTime->Rise );
pSlew->fall = SC_LibTimeFromPs( p->pLib, pTime->Fall );
}
}
// read output load
pTime = Abc_NtkReadDefaultOutputLoad( pNtk );
if ( Abc_MaxFloat(pTime->Rise, pTime->Fall) != 0 )
{
printf( "Default output load is specified (%.2f ff; %.2f ff).\n", pTime->Rise, pTime->Fall );
Abc_NtkForEachPo( pNtk, pObj, i )
{
SC_Pair * pSlew = Abc_SclObjLoad( p, pObj );
pSlew->rise = SC_LibCapFromFf( p->pLib, pTime->Rise );
pSlew->fall = SC_LibCapFromFf( p->pLib, pTime->Fall );
}
}
if ( Abc_NodeReadOutputLoad(pNtk, 0) != NULL )
{
printf( "Output loads for some primary outputs are specified.\n" );
Abc_NtkForEachPo( pNtk, pObj, i )
{
SC_Pair * pSlew = Abc_SclObjLoad( p, pObj );
pTime = Abc_NodeReadOutputLoad(pNtk, i);
pSlew->rise = SC_LibCapFromFf( p->pLib, pTime->Rise );
pSlew->fall = SC_LibCapFromFf( p->pLib, pTime->Fall );
}
}
}
/**Function*************************************************************
Synopsis [Prepare timing manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
SC_Man * Abc_SclManStart( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads, int fDept, float DUser )
{
SC_Man * p = Abc_SclManAlloc( pLib, pNtk );
assert( p->vGates == NULL );
p->vGates = Abc_SclManFindGates( pLib, pNtk );
Abc_SclManReadSlewAndLoad( p, pNtk );
if ( fUseWireLoads )
p->pWLoadUsed = Abc_SclFindWireLoadModel( pLib, Abc_SclGetTotalArea(p) );
Abc_SclTimeNtkRecompute( p, &p->SumArea0, &p->MaxDelay0, fDept, DUser );
p->SumArea = p->SumArea0;
return p;
}
/**Function*************************************************************
Synopsis [Printing out timing information for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_SclTimePerform( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fUseWireLoads, int fShowAll, int fPrintPath, int fDumpStats )
{
SC_Man * p;
p = Abc_SclManStart( pLib, pNtk, fUseWireLoads, 1, 0 );
Abc_SclTimeNtkPrint( p, fShowAll, fPrintPath );
if ( fDumpStats )
Abc_SclDumpStats( p, "stats.txt", 0 );
Abc_SclManFree( p );
}
/**Function*************************************************************
Synopsis [Printing out fanin information.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_SclCheckCommonInputs( Abc_Obj_t * pObj, Abc_Obj_t * pFanin )
{
Abc_Obj_t * pTemp;
int i;
Abc_ObjForEachFanin( pObj, pTemp, i )
if ( Abc_NodeFindFanin( pFanin, pTemp ) >= 0 )
{
printf( "Node %d and its fanin %d have common fanin %d.\n", Abc_ObjId(pObj), Abc_ObjId(pFanin), Abc_ObjId(pTemp) );
printf( "%-16s : ", Mio_GateReadName((Mio_Gate_t *)pObj->pData) );
Abc_ObjPrint( stdout, pObj );
printf( "%-16s : ", Mio_GateReadName((Mio_Gate_t *)pFanin->pData) );
Abc_ObjPrint( stdout, pFanin );
if ( pTemp->pData )
printf( "%-16s : ", Mio_GateReadName((Mio_Gate_t *)pTemp->pData) );
Abc_ObjPrint( stdout, pTemp );
return 1;
}
return 0;
}
void Abc_SclPrintFaninPairs( SC_Man * p, Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pObj, * pFanin;
int i, k;
Abc_NtkForEachNode( pNtk, pObj, i )
Abc_ObjForEachFanin( pObj, pFanin, k )
if ( Abc_ObjIsNode(pFanin) && Abc_ObjFanoutNum(pFanin) == 1 )
Abc_SclCheckCommonInputs( pObj, pFanin );
}
/**Function*************************************************************
Synopsis [Printing out buffer information.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Abc_ObjIsBuffer( Abc_Obj_t * pObj ) { return Abc_ObjIsNode(pObj) && Abc_ObjFaninNum(pObj) == 1; }
int Abc_SclCountNonBufferFanouts( Abc_Obj_t * pObj )
{
Abc_Obj_t * pFanout;
int i, Counter = 0;
if ( !Abc_ObjIsBuffer(pObj) )
return 1;
Abc_ObjForEachFanout( pObj, pFanout, i )
Counter += Abc_SclCountNonBufferFanouts( pFanout );
return Counter;
}
int Abc_SclHasBufferFanout( Abc_Obj_t * pObj )
{
Abc_Obj_t * pFanout;
int i;
Abc_ObjForEachFanout( pObj, pFanout, i )
if ( Abc_ObjIsBuffer(pFanout) )
return 1;
return 0;
}
void Abc_SclPrintBuffersInt( SC_Man * p, Abc_Obj_t * pObj, int nOffset )
{
// SC_Cell_t * pCell = Abc_SclObjCell(p, pObj);
Abc_Obj_t * pFanout;
int i;
assert( Abc_ObjIsBuffer(pObj) );
for ( i = 0; i < nOffset; i++ )
printf( " " );
printf( "%6d: %-16s (%2d:%3d) ", Abc_ObjId(pObj), Mio_GateReadName((Mio_Gate_t *)pObj->pData),
Abc_ObjFanoutNum(pObj), Abc_SclCountNonBufferFanouts(pObj) );
for ( ; i < 4; i++ )
printf( " " );
printf( "a =%5.2f ", Abc_SclObjCell(p, pObj)->area );
printf( "d = (" );
printf( "%7.2f ps; ", Abc_SclObjTimePs(p, pObj, 1) );
printf( "%7.2f ps) ", Abc_SclObjTimePs(p, pObj, 0) );
printf( "l =%6.2f ff ", Abc_SclObjLoadFf(p, pObj, 0 ) );
printf( "s =%6.2f ps ", Abc_SclObjSlewPs(p, pObj, 0 ) );
printf( "sl =%6.2f ps", Abc_SclObjSlack(p, pObj) );
printf( "\n" );
Abc_ObjForEachFanout( pObj, pFanout, i )
if ( Abc_ObjIsBuffer(pFanout) )
Abc_SclPrintBuffersInt( p, pFanout, nOffset + 1 );
}
void Abc_SclPrintBufferTrees( SC_Man * p, Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pObj;
int i;
Abc_NtkForEachObj( pNtk, pObj, i )
if ( Abc_ObjIsBuffer(pObj) && Abc_SclHasBufferFanout(pObj) )
Abc_SclPrintBuffersInt( p, pObj, 0 ), printf( "\n" );
}
void Abc_SclPrintBuffers( SC_Lib * pLib, Abc_Ntk_t * pNtk, int fVerbose )
{
int fUseWireLoads = 0;
SC_Man * p;
assert( Abc_NtkIsMappedLogic(pNtk) );
p = Abc_SclManStart( pLib, pNtk, fUseWireLoads, 1, 0 );
Abc_SclPrintBufferTrees( p, pNtk );
// Abc_SclPrintFaninPairs( p, pNtk );
Abc_SclManFree( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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