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/**CFile****************************************************************
FileName [fsimFront.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Fast sequential AIG simulator.]
Synopsis [Simulation frontier.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: fsimFront.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "fsimInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Fsim_ManStoreNum( Fsim_Man_t * p, int Num )
{
unsigned x = (unsigned)Num;
assert( Num >= 0 );
while ( x & ~0x7f )
{
*p->pDataCur++ = (x & 0x7f) | 0x80;
x >>= 7;
}
*p->pDataCur++ = x;
assert( p->pDataCur - p->pDataAig < p->nDataAig );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Fsim_ManRestoreNum( Fsim_Man_t * p )
{
int ch, i, x = 0;
for ( i = 0; (ch = *p->pDataCur++) & 0x80; i++ )
x |= (ch & 0x7f) << (7 * i);
assert( p->pDataCur - p->pDataAig < p->nDataAig );
return x | (ch << (7 * i));
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Fsim_ManStoreObj( Fsim_Man_t * p, Fsim_Obj_t * pObj )
{
if ( p->pDataAig2 )
{
*p->pDataCur2++ = pObj->iNode;
*p->pDataCur2++ = pObj->iFan0;
*p->pDataCur2++ = pObj->iFan1;
return;
}
if ( pObj->iFan0 && pObj->iFan1 ) // and
{
assert( pObj->iNode );
assert( pObj->iNode >= p->iNodePrev );
assert( (pObj->iNode << 1) > pObj->iFan0 );
assert( pObj->iFan0 > pObj->iFan1 );
Fsim_ManStoreNum( p, ((pObj->iNode - p->iNodePrev) << 2) | 3 );
Fsim_ManStoreNum( p, (pObj->iNode << 1) - pObj->iFan0 );
Fsim_ManStoreNum( p, pObj->iFan0 - pObj->iFan1 );
p->iNodePrev = pObj->iNode;
}
else if ( !pObj->iFan0 && !pObj->iFan1 ) // ci
{
assert( pObj->iNode );
assert( pObj->iNode >= p->iNodePrev );
Fsim_ManStoreNum( p, ((pObj->iNode - p->iNodePrev) << 2) | 1 );
p->iNodePrev = pObj->iNode;
}
else // if ( !pObj->iFan0 && pObj->iFan1 ) // co
{
assert( pObj->iNode == 0 );
assert( pObj->iFan0 != 0 );
assert( pObj->iFan1 == 0 );
assert( ((p->iNodePrev << 1) | 1) >= pObj->iFan0 );
Fsim_ManStoreNum( p, (((p->iNodePrev << 1) | 1) - pObj->iFan0) << 1 );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Fsim_ManRestoreObj( Fsim_Man_t * p, Fsim_Obj_t * pObj )
{
int iValue = Fsim_ManRestoreNum( p );
if ( (iValue & 3) == 3 ) // and
{
pObj->iNode = (iValue >> 2) + p->iNodePrev;
pObj->iFan0 = (pObj->iNode << 1) - Fsim_ManRestoreNum( p );
pObj->iFan1 = pObj->iFan0 - Fsim_ManRestoreNum( p );
p->iNodePrev = pObj->iNode;
}
else if ( (iValue & 3) == 1 ) // ci
{
pObj->iNode = (iValue >> 2) + p->iNodePrev;
pObj->iFan0 = 0;
pObj->iFan1 = 0;
p->iNodePrev = pObj->iNode;
}
else // if ( (iValue & 1) == 0 ) // co
{
pObj->iNode = 0;
pObj->iFan0 = ((p->iNodePrev << 1) | 1) - (iValue >> 1);
pObj->iFan1 = 0;
}
return 1;
}
/**Function*************************************************************
Synopsis [Determine the frontier.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Fsim_ManFrontFindNext( Fsim_Man_t * p, char * pFront )
{
assert( p->iNumber < (1 << 30) - p->nFront );
while ( 1 )
{
if ( p->iNumber % p->nFront == 0 )
p->iNumber++;
if ( pFront[p->iNumber % p->nFront] == 0 )
{
pFront[p->iNumber % p->nFront] = 1;
return p->iNumber;
}
p->iNumber++;
}
return -1;
}
/**Function*************************************************************
Synopsis [Verifies the frontier.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fsim_ManVerifyFront( Fsim_Man_t * p )
{
Fsim_Obj_t * pObj;
int * pFans0, * pFans1; // representation of fanins
int * pFrontToId; // mapping of nodes into frontier variables
int i, iVar0, iVar1;
pFans0 = ABC_ALLOC( int, p->nObjs );
pFans1 = ABC_ALLOC( int, p->nObjs );
pFans0[0] = pFans1[0] = 0;
pFans0[1] = pFans1[1] = 0;
pFrontToId = ABC_CALLOC( int, p->nFront );
if ( Aig_ObjRefs(Aig_ManConst1(p->pAig)) )
pFrontToId[1] = 1;
Fsim_ManForEachObj( p, pObj, i )
{
if ( pObj->iNode )
pFrontToId[pObj->iNode % p->nFront] = i;
iVar0 = Fsim_Lit2Var(pObj->iFan0);
iVar1 = Fsim_Lit2Var(pObj->iFan1);
pFans0[i] = Fsim_Var2Lit(pFrontToId[iVar0 % p->nFront], Fsim_LitIsCompl(pObj->iFan0));
pFans1[i] = Fsim_Var2Lit(pFrontToId[iVar1 % p->nFront], Fsim_LitIsCompl(pObj->iFan1));
}
for ( i = 0; i < p->nObjs; i++ )
{
assert( pFans0[i] == p->pFans0[i] );
assert( pFans1[i] == p->pFans1[i] );
}
ABC_FREE( pFrontToId );
ABC_FREE( pFans0 );
ABC_FREE( pFans1 );
}
/**Function*************************************************************
Synopsis [Determine the frontier.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fsim_ManFront( Fsim_Man_t * p, int fCompressAig )
{
Fsim_Obj_t Obj, * pObj = &Obj;
char * pFront; // places used for the frontier
int * pIdToFront; // mapping of nodes into frontier places
int i, iVar0, iVar1, nCrossCut = 0, nCrossCutMax = 0;
// start the frontier
pFront = ABC_CALLOC( char, p->nFront );
pIdToFront = ABC_ALLOC( int, p->nObjs );
pIdToFront[0] = -1;
pIdToFront[1] = -1;
// add constant node
p->iNumber = 1;
if ( p->pRefs[1] )
{
pIdToFront[1] = Fsim_ManFrontFindNext( p, pFront );
nCrossCut = 1;
}
// allocate room for data
if ( fCompressAig )
{
p->nDataAig = p->nObjs * 6;
p->pDataAig = ABC_ALLOC( unsigned char, p->nDataAig );
p->pDataCur = p->pDataAig;
p->iNodePrev = 0;
}
else
{
p->pDataAig2 = ABC_ALLOC( int, 3 * p->nObjs );
p->pDataCur2 = p->pDataAig2 + 6;
}
// iterate through the objects
for ( i = 2; i < p->nObjs; i++ )
{
if ( p->pFans0[i] == 0 ) // ci
{
// store node
pIdToFront[i] = Fsim_ManFrontFindNext( p, pFront );
pObj->iNode = pIdToFront[i];
pObj->iFan0 = 0;
pObj->iFan1 = 0;
Fsim_ManStoreObj( p, pObj );
// handle CIs without fanout
if ( p->pRefs[i] == 0 )
{
pFront[pIdToFront[i] % p->nFront] = 0;
pIdToFront[i] = -1;
}
}
else if ( p->pFans1[i] == 0 ) // co
{
assert( p->pRefs[i] == 0 );
// get the fanin
iVar0 = Fsim_Lit2Var(p->pFans0[i]);
assert( pIdToFront[iVar0] > 0 );
// store node
pObj->iNode = 0;
pObj->iFan0 = Fsim_Var2Lit(pIdToFront[iVar0], Fsim_LitIsCompl(p->pFans0[i]));
pObj->iFan1 = 0;
Fsim_ManStoreObj( p, pObj );
// deref the fanin
if ( --p->pRefs[iVar0] == 0 )
{
pFront[pIdToFront[iVar0] % p->nFront] = 0;
pIdToFront[iVar0] = -1;
nCrossCut--;
}
}
else
{
// get the fanins
iVar0 = Fsim_Lit2Var(p->pFans0[i]);
assert( pIdToFront[iVar0] > 0 );
iVar1 = Fsim_Lit2Var(p->pFans1[i]);
assert( pIdToFront[iVar1] > 0 );
// store node
pIdToFront[i] = Fsim_ManFrontFindNext( p, pFront );
pObj->iNode = pIdToFront[i];
pObj->iFan0 = Fsim_Var2Lit(pIdToFront[iVar0], Fsim_LitIsCompl(p->pFans0[i]));
pObj->iFan1 = Fsim_Var2Lit(pIdToFront[iVar1], Fsim_LitIsCompl(p->pFans1[i]));
Fsim_ManStoreObj( p, pObj );
// deref the fanins
if ( --p->pRefs[iVar0] == 0 )
{
pFront[pIdToFront[iVar0] % p->nFront] = 0;
pIdToFront[iVar0] = -1;
nCrossCut--;
}
if ( --p->pRefs[iVar1] == 0 )
{
pFront[pIdToFront[iVar1] % p->nFront] = 0;
pIdToFront[iVar1] = -1;
nCrossCut--;
}
// handle nodes without fanout (choice nodes)
if ( p->pRefs[i] == 0 )
{
pFront[pIdToFront[i] % p->nFront] = 0;
pIdToFront[i] = -1;
}
}
if ( p->pRefs[i] )
if ( nCrossCutMax < ++nCrossCut )
nCrossCutMax = nCrossCut;
}
assert( p->pDataAig2 == NULL || p->pDataCur2 - p->pDataAig2 == (3 * p->nObjs) );
assert( nCrossCut == 0 );
assert( nCrossCutMax == p->nCrossCutMax );
for ( i = 0; i < p->nFront; i++ )
assert( pFront[i] == 0 );
ABC_FREE( pFront );
ABC_FREE( pIdToFront );
// Fsim_ManVerifyFront( p );
ABC_FREE( p->pFans0 );
ABC_FREE( p->pFans1 );
ABC_FREE( p->pRefs );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
