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Improvements to the truth table computations.

This commit is contained in:
Alan Mishchenko 2012-10-30 23:42:04 -07:00
parent 32b09a1e7b
commit 66c044c688
1 changed files with 39 additions and 2 deletions
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41
src/misc/util/utilTruth.h
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@ -1075,7 +1075,7 @@ static inline unsigned Abc_TtSemiCanonicize( word * pTruth, int nVars, char * pC
{
int pStore[16];
int nWords = Abc_TtWordNum( nVars );
int i, Temp, fChange, nOnes;
int i, k, BestK, Temp, nOnes;//, nSwaps = 0;//, fChange;
unsigned uCanonPhase = 0;
assert( nVars <= 16 );
// normalize polarity
@ -1087,6 +1087,7 @@ static inline unsigned Abc_TtSemiCanonicize( word * pTruth, int nVars, char * pC
uCanonPhase |= (1 << nVars);
}
// normalize phase
// Abc_TtCountOnesInCofsSlow( pTruth, nVars, pStore );
Abc_TtCountOnesInCofs( pTruth, nVars, pStore );
for ( i = 0; i < nVars; i++ )
{
@ -1096,7 +1097,7 @@ static inline unsigned Abc_TtSemiCanonicize( word * pTruth, int nVars, char * pC
uCanonPhase |= (1 << i);
pStore[i] = nOnes - pStore[i];
}
/*
do {
fChange = 0;
for ( i = 0; i < nVars-1; i++ )
@ -1119,8 +1120,44 @@ static inline unsigned Abc_TtSemiCanonicize( word * pTruth, int nVars, char * pC
}
Abc_TtSwapAdjacent( pTruth, nWords, i );
fChange = 1;
// nSwaps++;
}
} while ( fChange );
*/
for ( i = 0; i < nVars - 1; i++ )
{
BestK = i + 1;
for ( k = i + 2; k < nVars; k++ )
if ( pStore[BestK] > pStore[k] )
BestK = k;
if ( pStore[BestK] >= pStore[i] )
continue;
Temp = pCanonPerm[i];
pCanonPerm[i] = pCanonPerm[BestK];
pCanonPerm[BestK] = Temp;
Temp = pStore[i];
pStore[i] = pStore[BestK];
pStore[BestK] = Temp;
if ( ((uCanonPhase >> i) & 1) != ((uCanonPhase >> BestK) & 1) )
{
uCanonPhase ^= (1 << i);
uCanonPhase ^= (1 << BestK);
}
Abc_TtSwapVars( pTruth, nVars, i, BestK );
// nSwaps++;
}
/*
printf( "%d ", nSwaps );
printf( "Minterms: " );
for ( i = 0; i < nVars; i++ )
printf( "%d ", pStore[i] );
printf( "\n" );
*/
return uCanonPhase;
}