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</**CFile****************************************************************
FileName [mvcDivisor.c]
PackageName [MVSIS 2.0: Multi-valued logic synthesis system.]
Synopsis [Procedures for compute the quick divisor.]
Author [MVSIS Group]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - February 1, 2003.]
Revision [$Id: mvcDivisor.c,v 1.1 2003/04/03 15:34:08 alanmi Exp $]
***********************************************************************/
#include "mvc.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Mvc_CoverDivisorZeroKernel( Mvc_Cover_t * pCover );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns the quick divisor of the cover.]
Description [Returns NULL, if there is not divisor other than
trivial.]
SideEffects []
SeeAlso []
***********************************************************************/
Mvc_Cover_t * Mvc_CoverDivisor( Mvc_Cover_t * pCover )
{
Mvc_Cover_t * pKernel;
if ( Mvc_CoverReadCubeNum(pCover) <= 1 )
return NULL;
// allocate the literal array and count literals
if ( Mvc_CoverAnyLiteral( pCover, NULL ) == -1 )
return NULL;
// duplicate the cover
pKernel = Mvc_CoverDup(pCover);
// perform the kerneling
Mvc_CoverDivisorZeroKernel( pKernel );
assert( Mvc_CoverReadCubeNum(pKernel) );
return pKernel;
}
/**Function*************************************************************
Synopsis [Computes a level-zero kernel.]
Description [Modifies the cover to contain one level-zero kernel.]
SideEffects []
SeeAlso []
***********************************************************************/
void Mvc_CoverDivisorZeroKernel( Mvc_Cover_t * pCover )
{
int iLit;
// find any literal that occurs at least two times
// iLit = Mvc_CoverAnyLiteral( pCover, NULL );
iLit = Mvc_CoverWorstLiteral( pCover, NULL );
// iLit = Mvc_CoverBestLiteral( pCover, NULL );
if ( iLit == -1 )
return;
// derive the cube-free quotient
Mvc_CoverDivideByLiteralQuo( pCover, iLit ); // the same cover
Mvc_CoverMakeCubeFree( pCover ); // the same cover
// call recursively
Mvc_CoverDivisorZeroKernel( pCover ); // the same cover
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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