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/**CFile****************************************************************
FileName [mapperCanon.c]
PackageName [MVSIS 1.3: Multi-valued logic synthesis system.]
Synopsis [Generic technology mapping engine.]
Author [MVSIS Group]
Affiliation [UC Berkeley]
Date [Ver. 2.0. Started - June 1, 2004.]
Revision [$Id: mapperCanon.c,v 1.2 2005/01/23 06:59:42 alanmi Exp $]
***********************************************************************/
#include "mapperInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static unsigned Map_CanonComputePhase( unsigned uTruths[][2], int nVars, unsigned uTruth, unsigned uPhase );
static void Map_CanonComputePhase6( unsigned uTruths[][2], int nVars, unsigned uTruth[], unsigned uPhase, unsigned uTruthRes[] );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes the N-canonical form of the Boolean function.]
Description [The N-canonical form is defined as the truth table with
the minimum integer value. This function exhaustively enumerates
through the complete set of 2^N phase assignments.]
SideEffects []
SeeAlso []
***********************************************************************/
int Map_CanonComputeSlow( unsigned uTruths[][2], int nVarsMax, int nVarsReal, unsigned uTruth[], unsigned char * puPhases, unsigned uTruthRes[] )
{
unsigned uTruthPerm[2];
int nMints, nPhases, m;
nPhases = 0;
nMints = (1 << nVarsReal);
if ( nVarsMax < 6 )
{
uTruthRes[0] = MAP_MASK(32);
for ( m = 0; m < nMints; m++ )
{
uTruthPerm[0] = Map_CanonComputePhase( uTruths, nVarsMax, uTruth[0], m );
if ( uTruthRes[0] > uTruthPerm[0] )
{
uTruthRes[0] = uTruthPerm[0];
nPhases = 0;
puPhases[nPhases++] = (unsigned char)m;
}
else if ( uTruthRes[0] == uTruthPerm[0] )
{
if ( nPhases < 4 ) // the max number of phases in Map_Super_t
puPhases[nPhases++] = (unsigned char)m;
}
}
uTruthRes[1] = uTruthRes[0];
}
else
{
uTruthRes[0] = MAP_MASK(32);
uTruthRes[1] = MAP_MASK(32);
for ( m = 0; m < nMints; m++ )
{
Map_CanonComputePhase6( uTruths, nVarsMax, uTruth, m, uTruthPerm );
if ( uTruthRes[1] > uTruthPerm[1] || uTruthRes[1] == uTruthPerm[1] && uTruthRes[0] > uTruthPerm[0] )
{
uTruthRes[0] = uTruthPerm[0];
uTruthRes[1] = uTruthPerm[1];
nPhases = 0;
puPhases[nPhases++] = (unsigned char)m;
}
else if ( uTruthRes[1] == uTruthPerm[1] && uTruthRes[0] == uTruthPerm[0] )
{
if ( nPhases < 4 ) // the max number of phases in Map_Super_t
puPhases[nPhases++] = (unsigned char)m;
}
}
}
assert( nPhases > 0 );
// printf( "%d ", nPhases );
return nPhases;
}
/**Function*************************************************************
Synopsis [Performs phase transformation for one function of less than 6 variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned Map_CanonComputePhase( unsigned uTruths[][2], int nVars, unsigned uTruth, unsigned uPhase )
{
int v, Shift;
for ( v = 0, Shift = 1; v < nVars; v++, Shift <<= 1 )
if ( uPhase & Shift )
uTruth = (((uTruth & ~uTruths[v][0]) << Shift) | ((uTruth & uTruths[v][0]) >> Shift));
return uTruth;
}
/**Function*************************************************************
Synopsis [Performs phase transformation for one function of 6 variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Map_CanonComputePhase6( unsigned uTruths[][2], int nVars, unsigned uTruth[], unsigned uPhase, unsigned uTruthRes[] )
{
unsigned uTemp;
int v, Shift;
// initialize the result
uTruthRes[0] = uTruth[0];
uTruthRes[1] = uTruth[1];
if ( uPhase == 0 )
return;
// compute the phase
for ( v = 0, Shift = 1; v < nVars; v++, Shift <<= 1 )
if ( uPhase & Shift )
{
if ( Shift < 32 )
{
uTruthRes[0] = (((uTruthRes[0] & ~uTruths[v][0]) << Shift) | ((uTruthRes[0] & uTruths[v][0]) >> Shift));
uTruthRes[1] = (((uTruthRes[1] & ~uTruths[v][1]) << Shift) | ((uTruthRes[1] & uTruths[v][1]) >> Shift));
}
else
{
uTemp = uTruthRes[0];
uTruthRes[0] = uTruthRes[1];
uTruthRes[1] = uTemp;
}
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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