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/**CFile****************************************************************
FileName [absRpm.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Abstraction package.]
Synopsis [Structural reparameterization.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: absRpm.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abs.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManCountPisNodes_rec( Gia_Man_t * p, Gia_Obj_t * pObj, int * pnPis, int * pnNodes )
{
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
return;
Gia_ObjSetTravIdCurrent(p, pObj);
if ( pObj->fMark0 )
{
(*pnPis)++;
return;
}
assert( Gia_ObjIsAnd(pObj) );
Gia_ManCountPisNodes_rec( p, Gia_ObjFanin0(pObj), pnPis, pnNodes );
Gia_ManCountPisNodes_rec( p, Gia_ObjFanin1(pObj), pnPis, pnNodes );
(*pnNodes)++;
}
void Gia_ManCountPisNodes( Gia_Man_t * p, int * pnPis, int * pnNodes )
{
Gia_Obj_t * pObj;
int i;
// mark const0 and flop output
Gia_ManIncrementTravId( p );
Gia_ObjSetTravIdCurrent( p, Gia_ManConst0(p) );
Gia_ManForEachRo( p, pObj, i )
Gia_ObjSetTravIdCurrent( p, pObj );
// count PIs and internal nodes reachable from COs
*pnPis = *pnNodes = 0;
Gia_ManForEachCo( p, pObj, i )
Gia_ManCountPisNodes_rec( p, Gia_ObjFanin0(pObj), pnPis, pnNodes );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abs_ManSupport_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSupp )
{
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
return;
Gia_ObjSetTravIdCurrent(p, pObj);
if ( pObj->fMark0 || Gia_ObjIsRo(p, pObj) )
{
Vec_IntPush( vSupp, Gia_ObjId(p, pObj) );
return;
}
assert( Gia_ObjIsAnd(pObj) );
Abs_ManSupport_rec( p, Gia_ObjFanin0(pObj), vSupp );
Abs_ManSupport_rec( p, Gia_ObjFanin1(pObj), vSupp );
}
int Abs_ManSupport( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSupp )
{
assert( Gia_ObjIsAnd(pObj) );
Vec_IntClear( vSupp );
Gia_ManIncrementTravId( p );
Abs_ManSupport_rec( p, pObj, vSupp );
return Vec_IntSize(vSupp);
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abs_GiaObjDeref_rec( Gia_Man_t * p, Gia_Obj_t * pNode )
{
Gia_Obj_t * pFanin;
int Counter = 0;
if ( pNode->fMark0 || Gia_ObjIsRo(p, pNode) )
return 0;
assert( Gia_ObjIsAnd(pNode) );
pFanin = Gia_ObjFanin0(pNode);
assert( Gia_ObjRefs(p, pFanin) > 0 );
if ( Gia_ObjRefDec(p, pFanin) == 0 )
Counter += Abs_GiaObjDeref_rec( p, pFanin );
pFanin = Gia_ObjFanin1(pNode);
assert( Gia_ObjRefs(p, pFanin) > 0 );
if ( Gia_ObjRefDec(p, pFanin) == 0 )
Counter += Abs_GiaObjDeref_rec( p, pFanin );
return Counter + 1;
}
int Abs_GiaObjRef_rec( Gia_Man_t * p, Gia_Obj_t * pNode )
{
Gia_Obj_t * pFanin;
int Counter = 0;
if ( pNode->fMark0 || Gia_ObjIsRo(p, pNode) )
return 0;
assert( Gia_ObjIsAnd(pNode) );
pFanin = Gia_ObjFanin0(pNode);
if ( Gia_ObjRefInc(p, pFanin) == 0 )
Counter += Abs_GiaObjRef_rec( p, pFanin );
pFanin = Gia_ObjFanin1(pNode);
if ( Gia_ObjRefInc(p, pFanin) == 0 )
Counter += Abs_GiaObjRef_rec( p, pFanin );
return Counter + 1;
}
/**Function*************************************************************
Synopsis [Returns the number of nodes with zero refs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abs_GiaSortNodes( Gia_Man_t * p, Vec_Int_t * vSupp )
{
Gia_Obj_t * pObj;
int nSize = Vec_IntSize(vSupp);
int i, RetValue;
Gia_ManForEachObjVec( vSupp, p, pObj, i )
if ( i < nSize && Gia_ObjRefs(p, pObj) == 0 && !Gia_ObjIsRo(p, pObj) ) // add removable leaves
Vec_IntPush( vSupp, Gia_ObjId(p, pObj) );
RetValue = Vec_IntSize(vSupp) - nSize;
Gia_ManForEachObjVec( vSupp, p, pObj, i )
if ( i < nSize && !(Gia_ObjRefs(p, pObj) == 0 && !Gia_ObjIsRo(p, pObj)) ) // add non-removable leaves
Vec_IntPush( vSupp, Gia_ObjId(p, pObj) );
assert( Vec_IntSize(vSupp) == 2 * nSize );
memmove( Vec_IntArray(vSupp), Vec_IntArray(vSupp) + nSize, sizeof(int) * nSize );
Vec_IntShrink( vSupp, nSize );
return RetValue;
}
/**Function*************************************************************
Synopsis [Returns 1 if truth table has no const cofactors.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abs_GiaCheckTruth( word * pTruth, int nSize, int nSize0 )
{
char * pStr = (char *)pTruth;
int i, k, nSteps, nStr = (nSize >= 3 ? (1 << (nSize - 3)) : 1);
assert( nSize0 > 0 && nSize0 <= nSize );
if ( nSize0 == 1 )
{
for ( i = 0; i < nStr; i++ )
if ( (((unsigned)pStr[i] ^ ((unsigned)pStr[i] >> 1)) & 0x55) != 0x55 )
return 0;
return 1;
}
if ( nSize0 == 2 )
{
for ( i = 0; i < nStr; i++ )
if ( ((unsigned)pStr[i] & 0xF) == 0xF || (((unsigned)pStr[i] >> 4) & 0xF) == 0xF ||
((unsigned)pStr[i] & 0xF) == 0x0 || (((unsigned)pStr[i] >> 4) & 0xF) == 0x0 )
return 0;
return 1;
}
assert( nSize0 >= 3 );
nSteps = (1 << (nSize0 - 3));
for ( i = 0; i < nStr; i += nSteps )
{
for ( k = 0; k < nSteps; k++ )
if ( ((unsigned)pStr[i+k] & 0xFF) != 0x00 )
break;
if ( k == nSteps )
break;
for ( k = 0; k < nSteps; k++ )
if ( ((unsigned)pStr[i+k] & 0xFF) != 0xFF )
break;
if ( k == nSteps )
break;
}
return (int)( i == nStr );
}
/**Function*************************************************************
Synopsis [Computes truth table up to 6 inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abs_GiaComputeTruth_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Wrd_t * vTruths )
{
word uTruth0, uTruth1;
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
return;
Gia_ObjSetTravIdCurrent(p, pObj);
assert( !pObj->fMark0 );
assert( Gia_ObjIsAnd(pObj) );
Abs_GiaComputeTruth_rec( p, Gia_ObjFanin0(pObj), vTruths );
Abs_GiaComputeTruth_rec( p, Gia_ObjFanin1(pObj), vTruths );
uTruth0 = Vec_WrdEntry( vTruths, Gia_ObjFanin0(pObj)->Value );
uTruth0 = Gia_ObjFaninC0(pObj) ? ~uTruth0 : uTruth0;
uTruth1 = Vec_WrdEntry( vTruths, Gia_ObjFanin1(pObj)->Value );
uTruth1 = Gia_ObjFaninC1(pObj) ? ~uTruth1 : uTruth1;
pObj->Value = Vec_WrdSize(vTruths);
Vec_WrdPush( vTruths, uTruth0 & uTruth1 );
}
word Abs_GiaComputeTruth( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSupp, Vec_Wrd_t * vTruths )
{
static word s_Truth6[6] = {
0xAAAAAAAAAAAAAAAA,
0xCCCCCCCCCCCCCCCC,
0xF0F0F0F0F0F0F0F0,
0xFF00FF00FF00FF00,
0xFFFF0000FFFF0000,
0xFFFFFFFF00000000
};
Gia_Obj_t * pLeaf;
int i;
assert( Vec_IntSize(vSupp) <= 6 );
assert( Gia_ObjIsAnd(pObj) );
assert( !pObj->fMark0 );
Vec_WrdClear( vTruths );
Gia_ManIncrementTravId( p );
Gia_ManForEachObjVec( vSupp, p, pLeaf, i )
{
assert( pLeaf->fMark0 || Gia_ObjIsRo(p, pLeaf) );
pLeaf->Value = Vec_WrdSize(vTruths);
Vec_WrdPush( vTruths, s_Truth6[i] );
Gia_ObjSetTravIdCurrent(p, pLeaf);
}
Abs_GiaComputeTruth_rec( p, pObj, vTruths );
return Vec_WrdEntryLast( vTruths );
}
/**Function*************************************************************
Synopsis [Returns 1 if truth table has const cofactors.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abs_RpmPerformMark( Gia_Man_t * p, int nCutMax, int fVerbose )
{
Vec_Int_t * vSupp;
Vec_Wrd_t * vTruths;
Gia_Obj_t * pObj;
word uTruth;
int Iter, i, nPis, nNodes, nSize0;
int fChanges = 1;
Gia_ManCreateRefs( p );
Gia_ManCleanMark0( p );
Gia_ManForEachPi( p, pObj, i )
pObj->fMark0 = 1;
vSupp = Vec_IntAlloc( 100 );
vTruths = Vec_WrdAlloc( 100 );
for ( Iter = 0; fChanges; Iter++ )
{
// count the number of PIs and internal nodes
if ( fVerbose )
{
Gia_ManCountPisNodes( p, &nPis, &nNodes );
printf( "Iter %3d : ", Iter );
printf( "PI = %5d ", nPis );
printf( "And = %6d ", nNodes );
printf( "\n" );
}
fChanges = 0;
Gia_ManCleanMark1( p );
// pObj = Gia_ObjFanin0( Gia_ManPo(p, 0) );
Gia_ManForEachAnd( p, pObj, i )
{
if ( pObj->fMark0 )
continue;
if ( Gia_ObjRefs( p, pObj ) == 0 )
continue;
if ( Gia_ObjFanin0(pObj)->fMark1 || Gia_ObjFanin1(pObj)->fMark1 )
{
pObj->fMark1 = 1;
continue;
}
if ( Abs_ManSupport(p, pObj, vSupp) > nCutMax )
{
pObj->fMark1 = 1;
continue;
}
// pObj has structural support no more than nCutMax
Abs_GiaObjDeref_rec( p, pObj );
// sort support nodes by ref count
nSize0 = Abs_GiaSortNodes( p, vSupp );
// check how many support nodes have ref count 0
if ( nSize0 == 0 )
{
Abs_GiaObjRef_rec( p, pObj );
continue;
}
// compute truth table
uTruth = Abs_GiaComputeTruth( p, pObj, vSupp, vTruths );
// check if truth table has const cofs
if ( !Abs_GiaCheckTruth( &uTruth, Vec_IntSize(vSupp), nSize0 ) ) // has const
{
Abs_GiaObjRef_rec( p, pObj );
// printf( " no\n" );
continue;
}
printf( "Node = %8d Supp = %2d Supp0 = %2d ", Gia_ObjId(p, pObj), Vec_IntSize(vSupp), nSize0 );
Extra_PrintHex( stdout, &uTruth, Vec_IntSize(vSupp) );
printf( " yes\n" );
// pObj can be reparamed
pObj->fMark0 = 1;
fChanges = 1;
}
}
Vec_IntFree( vSupp );
Vec_WrdFree( vTruths );
ABC_FREE( p->pRefs );
Gia_ManCleanMark0( p ); // temp
Gia_ManCleanMark1( p );
}
Gia_Man_t * Abs_RpmPerform( Gia_Man_t * p, int nCutMax, int fVerbose )
{
// Abs_GiaTest( p, nCutMax, fVerbose );
Abs_RpmPerformMark( p, nCutMax, 1 );
return NULL;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
