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/**CFile****************************************************************
FileName [aigOper.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Minimalistic And-Inverter Graph package.]
Synopsis [AIG operations.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006.]
Revision [$Id: aigOper.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// procedure to detect an EXOR gate
static inline int Aig_ObjIsExorType( Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Obj_t ** ppFan0, Aig_Obj_t ** ppFan1 )
{
if ( !Aig_IsComplement(p0) || !Aig_IsComplement(p1) )
return 0;
p0 = Aig_Regular(p0);
p1 = Aig_Regular(p1);
if ( !Aig_ObjIsAnd(p0) || !Aig_ObjIsAnd(p1) )
return 0;
if ( Aig_ObjFanin0(p0) != Aig_ObjFanin0(p1) || Aig_ObjFanin1(p0) != Aig_ObjFanin1(p1) )
return 0;
if ( Aig_ObjFaninC0(p0) == Aig_ObjFaninC0(p1) || Aig_ObjFaninC1(p0) == Aig_ObjFaninC1(p1) )
return 0;
*ppFan0 = Aig_ObjChild0(p0);
*ppFan1 = Aig_ObjChild1(p0);
return 1;
}
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns i-th elementary variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_IthVar( Aig_Man_t * p, int i )
{
int v;
for ( v = Aig_ManPiNum(p); v <= i; v++ )
Aig_ObjCreatePi( p );
assert( i < Vec_PtrSize(p->vPis) );
return Aig_ManPi( p, i );
}
/**Function*************************************************************
Synopsis [Perform one operation.]
Description [The argument nodes can be complemented.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Oper( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Type_t Type )
{
if ( Type == AIG_AND )
return Aig_And( p, p0, p1 );
if ( Type == AIG_EXOR )
return Aig_Exor( p, p0, p1 );
assert( 0 );
return NULL;
}
/**Function*************************************************************
Synopsis [Performs canonicization step.]
Description [The argument nodes can be complemented.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_And( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
{
Aig_Obj_t * pGhost, * pResult;
// Aig_Obj_t * pFan0, * pFan1;
// check trivial cases
if ( p0 == p1 )
return p0;
if ( p0 == Aig_Not(p1) )
return Aig_Not(p->pConst1);
if ( Aig_Regular(p0) == p->pConst1 )
return p0 == p->pConst1 ? p1 : Aig_Not(p->pConst1);
if ( Aig_Regular(p1) == p->pConst1 )
return p1 == p->pConst1 ? p0 : Aig_Not(p->pConst1);
// check if it can be an EXOR gate
// if ( Aig_ObjIsExorType( p0, p1, &pFan0, &pFan1 ) )
// return Aig_Exor( p, pFan0, pFan1 );
// check the table
pGhost = Aig_ObjCreateGhost( p, p0, p1, AIG_AND );
if ( pResult = Aig_TableLookup( p, pGhost ) )
return pResult;
return Aig_ObjCreate( p, pGhost );
}
/**Function*************************************************************
Synopsis [Performs canonicization step.]
Description [The argument nodes can be complemented.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Exor( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
{
/*
Aig_Obj_t * pGhost, * pResult;
// check trivial cases
if ( p0 == p1 )
return Aig_Not(p->pConst1);
if ( p0 == Aig_Not(p1) )
return p->pConst1;
if ( Aig_Regular(p0) == p->pConst1 )
return Aig_NotCond( p1, p0 == p->pConst1 );
if ( Aig_Regular(p1) == p->pConst1 )
return Aig_NotCond( p0, p1 == p->pConst1 );
// check the table
pGhost = Aig_ObjCreateGhost( p, p0, p1, AIG_EXOR );
if ( pResult = Aig_TableLookup( p, pGhost ) )
return pResult;
return Aig_ObjCreate( p, pGhost );
*/
return Aig_Or( p, Aig_And(p, p0, Aig_Not(p1)), Aig_And(p, Aig_Not(p0), p1) );
}
/**Function*************************************************************
Synopsis [Implements Boolean OR.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Or( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
{
return Aig_Not( Aig_And( p, Aig_Not(p0), Aig_Not(p1) ) );
}
/**Function*************************************************************
Synopsis [Implements ITE operation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Mux( Aig_Man_t * p, Aig_Obj_t * pC, Aig_Obj_t * p1, Aig_Obj_t * p0 )
{
/*
Aig_Obj_t * pTempA1, * pTempA2, * pTempB1, * pTempB2, * pTemp;
int Count0, Count1;
// consider trivial cases
if ( p0 == Aig_Not(p1) )
return Aig_Exor( p, pC, p0 );
// other cases can be added
// implement the first MUX (F = C * x1 + C' * x0)
// check for constants here!!!
pTempA1 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, pC, p1, AIG_AND) );
pTempA2 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pC), p0, AIG_AND) );
if ( pTempA1 && pTempA2 )
{
pTemp = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pTempA1), Aig_Not(pTempA2), AIG_AND) );
if ( pTemp ) return Aig_Not(pTemp);
}
Count0 = (pTempA1 != NULL) + (pTempA2 != NULL);
// implement the second MUX (F' = C * x1' + C' * x0')
pTempB1 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, pC, Aig_Not(p1), AIG_AND) );
pTempB2 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pC), Aig_Not(p0), AIG_AND) );
if ( pTempB1 && pTempB2 )
{
pTemp = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pTempB1), Aig_Not(pTempB2), AIG_AND) );
if ( pTemp ) return pTemp;
}
Count1 = (pTempB1 != NULL) + (pTempB2 != NULL);
// compare and decide which one to implement
if ( Count0 >= Count1 )
{
pTempA1 = pTempA1? pTempA1 : Aig_And(p, pC, p1);
pTempA2 = pTempA2? pTempA2 : Aig_And(p, Aig_Not(pC), p0);
return Aig_Or( p, pTempA1, pTempA2 );
}
pTempB1 = pTempB1? pTempB1 : Aig_And(p, pC, Aig_Not(p1));
pTempB2 = pTempB2? pTempB2 : Aig_And(p, Aig_Not(pC), Aig_Not(p0));
return Aig_Not( Aig_Or( p, pTempB1, pTempB2 ) );
*/
return Aig_Or( p, Aig_And(p, pC, p1), Aig_And(p, Aig_Not(pC), p0) );
}
/**Function*************************************************************
Synopsis [Implements ITE operation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Maj( Aig_Man_t * p, Aig_Obj_t * pA, Aig_Obj_t * pB, Aig_Obj_t * pC )
{
return Aig_Or( p, Aig_Or(p, Aig_And(p, pA, pB), Aig_And(p, pA, pC)), Aig_And(p, pB, pC) );
}
/**Function*************************************************************
Synopsis [Constructs the well-balanced tree of gates.]
Description [Disregards levels and possible logic sharing.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Multi_rec( Aig_Man_t * p, Aig_Obj_t ** ppObjs, int nObjs, Aig_Type_t Type )
{
Aig_Obj_t * pObj1, * pObj2;
if ( nObjs == 1 )
return ppObjs[0];
pObj1 = Aig_Multi_rec( p, ppObjs, nObjs/2, Type );
pObj2 = Aig_Multi_rec( p, ppObjs + nObjs/2, nObjs - nObjs/2, Type );
return Aig_Oper( p, pObj1, pObj2, Type );
}
/**Function*************************************************************
Synopsis [Old code.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Multi( Aig_Man_t * p, Aig_Obj_t ** pArgs, int nArgs, Aig_Type_t Type )
{
assert( Type == AIG_AND || Type == AIG_EXOR );
assert( nArgs > 0 );
return Aig_Multi_rec( p, pArgs, nArgs, Type );
}
/**Function*************************************************************
Synopsis [Implements the miter.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Miter( Aig_Man_t * p, Vec_Ptr_t * vPairs )
{
int i;
assert( vPairs->nSize > 0 );
assert( vPairs->nSize % 2 == 0 );
// go through the cubes of the node's SOP
for ( i = 0; i < vPairs->nSize; i += 2 )
vPairs->pArray[i/2] = Aig_Not( Aig_Exor( p, vPairs->pArray[i], vPairs->pArray[i+1] ) );
vPairs->nSize = vPairs->nSize/2;
return Aig_Not( Aig_Multi_rec( p, (Aig_Obj_t **)vPairs->pArray, vPairs->nSize, AIG_AND ) );
}
/**Function*************************************************************
Synopsis [Creates AND function with nVars inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_CreateAnd( Aig_Man_t * p, int nVars )
{
Aig_Obj_t * pFunc;
int i;
pFunc = Aig_ManConst1( p );
for ( i = 0; i < nVars; i++ )
pFunc = Aig_And( p, pFunc, Aig_IthVar(p, i) );
return pFunc;
}
/**Function*************************************************************
Synopsis [Creates AND function with nVars inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_CreateOr( Aig_Man_t * p, int nVars )
{
Aig_Obj_t * pFunc;
int i;
pFunc = Aig_ManConst0( p );
for ( i = 0; i < nVars; i++ )
pFunc = Aig_Or( p, pFunc, Aig_IthVar(p, i) );
return pFunc;
}
/**Function*************************************************************
Synopsis [Creates AND function with nVars inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_CreateExor( Aig_Man_t * p, int nVars )
{
Aig_Obj_t * pFunc;
int i;
pFunc = Aig_ManConst0( p );
for ( i = 0; i < nVars; i++ )
pFunc = Aig_Exor( p, pFunc, Aig_IthVar(p, i) );
return pFunc;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
