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/**CFile****************************************************************
FileName [npnUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName []
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: npnUtil.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "extra.h"
#include "npn.h"
#include "vec.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Checks if the variable belongs to the support.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_TruthCofactors( int nVars, uint8 * puTruth, uint8 * puElem[][32],
uint8 * puTruthCofs0[][32], uint8 * puTruthCofs1[][32] )
{
int v;
for ( v = 0; v < nVars; v++ )
{
Extra_BitSharp( nVars, puTruth, puElem[v], (uint8 *)puTruthCofs0[v] );
Extra_BitAnd ( nVars, puTruth, puElem[v], (uint8 *)puTruthCofs1[v] );
}
}
/**Function*************************************************************
Synopsis [Checks if the variable belongs to the support.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_TruthCountCofactorOnes( int nVars, uint8 * puTruthCofs[][32], int * pCounts )
{
int v, nBytes;
nBytes = Extra_BitCharNum( nVars );
for ( v = 0; v < nVars; v++ )
pCounts[v] = Extra_CountOnes( puTruthCofs[v], nBytes );
}
/**Function*************************************************************
Synopsis [Checks if the variable belongs to the support.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_TruthHasVar( int nVars, uint8 * puTruth, int iVar )
{
// elementary truth tables
static uint8 Signs[3] = {
0xAA, // 1010 1010
0xCC, // 1100 1100
0xF0 // 1111 0000
};
int nChars, nShift, i;
assert( iVar < nVars );
nChars = Extra_BitCharNum( nVars );
if ( iVar < 3 )
{
nShift = (1 << iVar);
for ( i = 0; i < nChars; i++ )
if ( ((puTruth[i] & Signs[iVar]) >> nShift) != (puTruth[i] & ~Signs[iVar]) )
return 1;
}
else
{
nShift = (1 << (iVar-3));
for ( i = 0; i < nChars; i++, i = (i % nShift)? i : i + nShift )
if ( puTruth[i] != puTruth[i+nShift] )
return 1;
}
return 0;
}
/**Function*************************************************************
Synopsis [Checks if the variable belongs to the support.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Npn_VarsTest( int nVars, uint8 * puTruth )
{
int v;
int Counter = 0;
for ( v = 0; v < nVars; v++ )
Counter += Extra_TruthHasVar( nVars, puTruth, v );
return Counter;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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