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/**CFile****************************************************************
FileName [cutTruth.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [K-feasible cut computation package.]
Synopsis [Incremental truth table computation.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: cutTruth.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cutInt.h"
/*
Truth tables computed in this package are represented as bit-strings
stored in the cut data structure. Cuts of any number of inputs have
the truth table with 2^k bits, where k is the max number of cut inputs.
*/
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// used in abcCut.c
int nTotal = 0;
int nGood = 0;
int nEqual = 0;
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes the stretching phase of the cut w.r.t. the merged cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline unsigned Cut_TruthPhase( Cut_Cut_t * pCut, Cut_Cut_t * pCut1 )
{
unsigned uPhase = 0;
int i, k;
for ( i = k = 0; i < (int)pCut->nLeaves; i++ )
{
if ( k == (int)pCut1->nLeaves )
break;
if ( pCut->pLeaves[i] < pCut1->pLeaves[k] )
continue;
assert( pCut->pLeaves[i] == pCut1->pLeaves[k] );
uPhase |= (1 << i);
k++;
}
return uPhase;
}
/**Function*************************************************************
Synopsis [Performs truth table computation.]
Description [This procedure cannot be used while recording oracle
because it will overwrite Num0 and Num1.]
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TruthNCanonicize( Cut_Cut_t * pCut )
{
unsigned uTruth;
unsigned * uCanon2;
char * pPhases2;
assert( pCut->nVarsMax < 6 );
// get the direct truth table
uTruth = *Cut_CutReadTruth(pCut);
// compute the direct truth table
Extra_TruthCanonFastN( pCut->nVarsMax, pCut->nLeaves, &uTruth, &uCanon2, &pPhases2 );
// uCanon[0] = uCanon2[0];
// uCanon[1] = (p->nVarsMax == 6)? uCanon2[1] : uCanon2[0];
// uPhases[0] = pPhases2[0];
pCut->uCanon0 = uCanon2[0];
pCut->Num0 = pPhases2[0];
// get the complemented truth table
uTruth = ~*Cut_CutReadTruth(pCut);
// compute the direct truth table
Extra_TruthCanonFastN( pCut->nVarsMax, pCut->nLeaves, &uTruth, &uCanon2, &pPhases2 );
// uCanon[0] = uCanon2[0];
// uCanon[1] = (p->nVarsMax == 6)? uCanon2[1] : uCanon2[0];
// uPhases[0] = pPhases2[0];
pCut->uCanon1 = uCanon2[0];
pCut->Num1 = pPhases2[0];
}
/**Function*************************************************************
Synopsis [Performs truth table computation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TruthComputeOld( Cut_Cut_t * pCut, Cut_Cut_t * pCut0, Cut_Cut_t * pCut1, int fCompl0, int fCompl1 )
{
static unsigned uTruth0[8], uTruth1[8];
int nTruthWords = Cut_TruthWords( pCut->nVarsMax );
unsigned * pTruthRes;
int i, uPhase;
// permute the first table
uPhase = Cut_TruthPhase( pCut, pCut0 );
Extra_TruthExpand( pCut->nVarsMax, nTruthWords, Cut_CutReadTruth(pCut0), uPhase, uTruth0 );
if ( fCompl0 )
{
for ( i = 0; i < nTruthWords; i++ )
uTruth0[i] = ~uTruth0[i];
}
// permute the second table
uPhase = Cut_TruthPhase( pCut, pCut1 );
Extra_TruthExpand( pCut->nVarsMax, nTruthWords, Cut_CutReadTruth(pCut1), uPhase, uTruth1 );
if ( fCompl1 )
{
for ( i = 0; i < nTruthWords; i++ )
uTruth1[i] = ~uTruth1[i];
}
// write the resulting table
pTruthRes = Cut_CutReadTruth(pCut);
if ( pCut->fCompl )
{
for ( i = 0; i < nTruthWords; i++ )
pTruthRes[i] = ~(uTruth0[i] & uTruth1[i]);
}
else
{
for ( i = 0; i < nTruthWords; i++ )
pTruthRes[i] = uTruth0[i] & uTruth1[i];
}
}
/**Function*************************************************************
Synopsis [Performs truth table computation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_TruthCompute( Cut_Man_t * p, Cut_Cut_t * pCut, Cut_Cut_t * pCut0, Cut_Cut_t * pCut1, int fCompl0, int fCompl1 )
{
// permute the first table
if ( fCompl0 )
Extra_TruthNot( p->puTemp[0], Cut_CutReadTruth(pCut0), pCut->nVarsMax );
else
Extra_TruthCopy( p->puTemp[0], Cut_CutReadTruth(pCut0), pCut->nVarsMax );
Extra_TruthStretch( p->puTemp[2], p->puTemp[0], pCut0->nLeaves, pCut->nVarsMax, Cut_TruthPhase(pCut, pCut0) );
// permute the second table
if ( fCompl1 )
Extra_TruthNot( p->puTemp[1], Cut_CutReadTruth(pCut1), pCut->nVarsMax );
else
Extra_TruthCopy( p->puTemp[1], Cut_CutReadTruth(pCut1), pCut->nVarsMax );
Extra_TruthStretch( p->puTemp[3], p->puTemp[1], pCut1->nLeaves, pCut->nVarsMax, Cut_TruthPhase(pCut, pCut1) );
// produce the resulting table
if ( pCut->fCompl )
Extra_TruthNand( Cut_CutReadTruth(pCut), p->puTemp[2], p->puTemp[3], pCut->nVarsMax );
else
Extra_TruthAnd( Cut_CutReadTruth(pCut), p->puTemp[2], p->puTemp[3], pCut->nVarsMax );
// Ivy_TruthTestOne( *Cut_CutReadTruth(pCut) );
// quit if no fancy computation is needed
if ( !p->pParams->fFancy )
return;
if ( pCut->nLeaves != 7 )
return;
// count the total number of truth tables computed
nTotal++;
// MAPPING INTO ALTERA 6-2 LOGIC BLOCKS
// call this procedure to find the minimum number of common variables in the cofactors
// if this number is less or equal than 3, the cut can be implemented using the 6-2 logic block
if ( Extra_TruthMinCofSuppOverlap( Cut_CutReadTruth(pCut), pCut->nVarsMax, NULL ) <= 4 )
nGood++;
// MAPPING INTO ACTEL 2x2 CELLS
// call this procedure to see if a semi-canonical form can be found in the lookup table
// (if it exists, then a two-level 3-input LUT implementation of the cut exists)
// Before this procedure is called, cell manager should be defined by calling
// Cut_CellLoad (make sure file "cells22_daomap_iwls.txt" is available in the working dir)
// if ( Cut_CellIsRunning() && pCut->nVarsMax <= 9 )
// nGood += Cut_CellTruthLookup( Cut_CutReadTruth(pCut), pCut->nVarsMax );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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