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Commit cb5e2308 by Alan Mishchenko
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Improved DSD.

parent 7ba37f49
Showing with 384 additions and 218 deletions
src/opt/dau/dau.h
......@@ -55,7 +55,7 @@ ABC_NAMESPACE_HEADER_START
/*=== dauCanon.c ==========================================================*/
extern unsigned Abc_TtCanonicize( word * pTruth, int nVars, char * pCanonPerm );
extern char * Dau_DsdDecompose( word * pTruth, int nVarsInit, int * pnSizeNonDec );
ABC_NAMESPACE_HEADER_END
......
src/opt/dau/dauDsd.c
......@@ -38,6 +38,7 @@ ABC_NAMESPACE_IMPL_START
<abc> = ITE( a, b, c )
*/
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
......@@ -706,21 +707,34 @@ char * Dau_DsdRun( word * p, int nVars )
/**Function*************************************************************
Synopsis [Data-structure to store DSD information.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
typedef struct Dau_Dsd_t_ Dau_Dsd_t;
struct Dau_Dsd_t_
{
int nVarsInit; // the initial number of variables
int nVarsUsed; // the current number of variables
char pVarDefs[32][8]; // variable definitions
char pOutput[DAU_MAX_STR]; // output stream
int nPos; // writing position
int nSizeNonDec; // size of the largest non-decomposable block
int nConsts; // the number of constant decompositions
int uConstMask; // constant decomposition mask
char pVarDefs[32][8]; // variable definitions
char Cache[32][32]; // variable cache
char pOutput[DAU_MAX_STR]; // output stream
};
/**Function*************************************************************
Synopsis []
Synopsis [Manipulation of DSD data-structure.]
Description []
......@@ -729,49 +743,88 @@ struct Dau_Dsd_t_
SeeAlso []
***********************************************************************/
void Dua_DsdInit( Dau_Dsd_t * p, int nVarsInit )
static inline void Dau_DsdInitialize( Dau_Dsd_t * p, int nVarsInit )
{
int i;
memset( p, 0, sizeof(Dau_Dsd_t) );
p->nVarsInit = p->nVarsUsed = nVarsInit;
int i, v, u;
assert( nVarsInit >= 0 && nVarsInit <= 16 );
p->nVarsInit = nVarsInit;
p->nVarsUsed = nVarsInit;
p->nPos = 0;
p->nSizeNonDec = 0;
p->nConsts = 0;
p->uConstMask = 0;
for ( i = 0; i < nVarsInit; i++ )
p->pVarDefs[i][0] = 'a' + i;
p->pVarDefs[i][0] = 'a' + i, p->pVarDefs[i][1] = 0;
for ( v = 0; v < nVarsInit; v++ )
for ( u = 0; u < nVarsInit; u++ )
p->Cache[v][u] = 0;
}
void Dua_DsdWrite( Dau_Dsd_t * p, char * pStr )
static inline void Dau_DsdWriteString( Dau_Dsd_t * p, char * pStr )
{
while ( *pStr )
p->pOutput[ p->nPos++ ] = *pStr++;
}
void Dua_DsdWriteInv( Dau_Dsd_t * p, int Cond )
{
if ( Cond )
p->pOutput[ p->nPos++ ] = '!';
}
void Dua_DsdWriteVar( Dau_Dsd_t * p, int iVar, int fInv )
static inline void Dau_DsdWriteVar( Dau_Dsd_t * p, int iVar, int fInv )
{
char * pStr;
if ( fInv )
p->pOutput[ p->nPos++ ] = '!';
for ( pStr = p->pVarDefs[iVar]; *pStr; pStr++ )
if ( *pStr >= 'a' + p->nVarsInit && *pStr < 'a' + p->nVarsUsed )
Dua_DsdWriteVar( p, *pStr - 'a', 0 );
Dau_DsdWriteVar( p, *pStr - 'a', 0 );
else
p->pOutput[ p->nPos++ ] = *pStr;
}
static inline void Dau_DsdTranslate( Dau_Dsd_t * p, int * pVars, int nVars, char * pStr )
{
for ( ; *pStr; pStr++ )
if ( *pStr >= 'a' + nVars && *pStr < 'a' + nVars )
Dau_DsdWriteVar( p, pVars[*pStr - 'a'], 0 );
else
p->pOutput[ p->nPos++ ] = *pStr;
}
void Dua_DsdWriteStop( Dau_Dsd_t * p )
static inline void Dau_DsdWritePrime( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
int v;
assert( nVars > 2 );
p->nPos += Abc_TtWriteHexRev( p->pOutput + p->nPos, pTruth, nVars );
Dau_DsdWriteString( p, "{" );
for ( v = 0; v < nVars; v++ )
Dau_DsdWriteVar( p, pVars[v], 0 );
Dau_DsdWriteString( p, "}" );
p->nSizeNonDec = nVars;
}
static inline void Dau_DsdFinalize( Dau_Dsd_t * p )
{
int i;
for ( i = 0; i < p->nConsts; i++ )
p->pOutput[ p->nPos++ ] = ((p->uConstMask >> i) & 1) ? ']' : ')';
p->pOutput[ p->nPos++ ] = ((p->uConstMask >> (p->nConsts-1-i)) & 1) ? ']' : ')';
p->pOutput[ p->nPos++ ] = 0;
}
int Dua_DsdAddVarDef( Dau_Dsd_t * p, char * pStr )
static inline int Dau_DsdAddVarDef( Dau_Dsd_t * p, char * pStr )
{
int u;
assert( strlen(pStr) < 8 );
assert( p->nVarsUsed < 32 );
for ( u = 0; u < p->nVarsUsed; u++ )
p->Cache[p->nVarsUsed][u] = 0;
for ( u = 0; u < p->nVarsUsed; u++ )
p->Cache[u][p->nVarsUsed] = 0;
sprintf( p->pVarDefs[p->nVarsUsed++], "%s", pStr );
return p->nVarsUsed - 1;
}
static inline void Dau_DsdInsertVarCache( Dau_Dsd_t * p, int v, int u, int Status )
{
assert( v != u );
assert( Status > 0 && Status < 4 );
assert( p->Cache[v][u] == 0 );
p->Cache[v][u] = Status;
}
static inline int Dau_DsdLookupVarCache( Dau_Dsd_t * p, int v, int u )
{
return p->Cache[v][u];
}
/**Function*************************************************************
......@@ -784,7 +837,7 @@ int Dua_DsdAddVarDef( Dau_Dsd_t * p, char * pStr )
SeeAlso []
***********************************************************************/
int Dua_DsdMinBase( word * pTruth, int nVars, int * pVarsNew )
int Dau_DsdMinBase( word * pTruth, int nVars, int * pVarsNew )
{
int v;
for ( v = 0; v < nVars; v++ )
......@@ -801,7 +854,7 @@ int Dua_DsdMinBase( word * pTruth, int nVars, int * pVarsNew )
/**Function*************************************************************
Synopsis [Returns 1 if constant cofactor is found.]
Synopsis [Procedures specialized for 6-variable functions.]
Description []
......@@ -810,14 +863,14 @@ int Dua_DsdMinBase( word * pTruth, int nVars, int * pVarsNew )
SeeAlso []
***********************************************************************/
int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v )
static inline int Dau_Dsd6DecomposeSingleVarOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v )
{
// consider negative cofactors
if ( pTruth[0] & 1 )
{
if ( Abc_Tt6Cof0IsConst1( pTruth[0], v ) ) // !(ax)
{
Dua_DsdWrite( p, "!(" );
Dau_DsdWriteString( p, "!(" );
pTruth[0] = ~Abc_Tt6Cofactor1( pTruth[0], v );
goto finish;
}
......@@ -826,7 +879,7 @@ int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int
{
if ( Abc_Tt6Cof0IsConst0( pTruth[0], v ) ) // ax
{
Dua_DsdWrite( p, "(" );
Dau_DsdWriteString( p, "(" );
pTruth[0] = Abc_Tt6Cofactor1( pTruth[0], v );
goto finish;
}
......@@ -836,7 +889,7 @@ int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int
{
if ( Abc_Tt6Cof1IsConst1( pTruth[0], v ) ) // !(!ax)
{
Dua_DsdWrite( p, "!(!" );
Dau_DsdWriteString( p, "!(!" );
pTruth[0] = ~Abc_Tt6Cofactor0( pTruth[0], v );
goto finish;
}
......@@ -845,7 +898,7 @@ int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int
{
if ( Abc_Tt6Cof1IsConst0( pTruth[0], v ) ) // !ax
{
Dua_DsdWrite( p, "(!" );
Dau_DsdWriteString( p, "(!" );
pTruth[0] = Abc_Tt6Cofactor0( pTruth[0], v );
goto finish;
}
......@@ -853,7 +906,7 @@ int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int
// consider equal cofactors
if ( Abc_Tt6CofsOpposite( pTruth[0], v ) ) // [ax]
{
Dua_DsdWrite( p, "[" );
Dau_DsdWriteString( p, "[" );
pTruth[0] = Abc_Tt6Cofactor0( pTruth[0], v );
p->uConstMask |= (1 << p->nConsts);
goto finish;
......@@ -862,247 +915,360 @@ int Dau_Dsd6DecomposeConstCofOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int
finish:
p->nConsts++;
Dua_DsdWriteVar( p, pVars[v], 0 );
Dau_DsdWriteVar( p, pVars[v], 0 );
pVars[v] = pVars[nVars-1];
Abc_TtSwapVars( pTruth, 6, v, nVars-1 );
return 1;
}
int Dau_Dsd6DecomposeConstCof( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
int Dau_Dsd6DecomposeSingleVar( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
int v, nVarsOld;
assert( nVars > 1 );
while ( 1 )
{
nVarsOld = nVars;
int v;
for ( v = nVars - 1; v >= 0 && nVars > 1; v-- )
if ( Dau_Dsd6DecomposeConstCofOne( p, pTruth, pVars, nVars, v ) )
if ( Dau_Dsd6DecomposeSingleVarOne( p, pTruth, pVars, nVars, v ) )
{
nVars--;
if ( nVarsOld == nVars || nVars == 1 )
break;
}
if ( v == -1 || nVars == 1 )
break;
}
if ( nVars == 1 )
Dua_DsdWriteVar( p, pVars[--nVars], (int)(pTruth[0] & 1) );
Dau_DsdWriteVar( p, pVars[--nVars], (int)(pTruth[0] & 1) );
return nVars;
}
void Dau_Dsd6DecomposeInternal( Dau_Dsd_t * p, word t, int * pVars, int nVars )
static inline int Dau_Dsd6FindSupportOne( Dau_Dsd_t * p, word tCof0, word tCof1, int * pVars, int nVars, int v, int u )
{
char pBuffer[10];
int v, u;
nVars = Dau_Dsd6DecomposeConstCof( p, &t, pVars, nVars );
if ( nVars == 0 )
return;
// consider two-variable cofactors
for ( v = nVars - 1; v > 0; v-- )
int Status = Dau_DsdLookupVarCache( p, pVars[v], pVars[u] );
if ( Status == 0 )
{
word tCof0 = Abc_Tt6Cofactor0( t, v );
word tCof1 = Abc_Tt6Cofactor1( t, v );
unsigned uSupp0 = 0, uSupp1 = 0;
Kit_DsdPrintFromTruth( &t, 6 );printf( "\n" );
pBuffer[0] = 0;
for ( u = v - 1; u >= 0; u-- )
Status = (Abc_Tt6HasVar(tCof1, u) << 1) | Abc_Tt6HasVar(tCof0, u);
Dau_DsdInsertVarCache( p, pVars[v], pVars[u], Status );
}
return Status;
}
static inline unsigned Dau_Dsd6FindSupports( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v )
{
int u;
unsigned uSupports = 0;
word tCof0 = Abc_Tt6Cofactor0( pTruth[0], v );
word tCof1 = Abc_Tt6Cofactor1( pTruth[0], v );
for ( u = 0; u < nVars; u++ )
if ( u != v )
uSupports |= (Dau_Dsd6FindSupportOne( p, tCof0, tCof1, pVars, nVars, v, u ) << (2 * u));
return uSupports;
}
static inline void Dau_DsdPrintSupports( unsigned uSupp, int nVars )
{
int v, Value;
printf( "Cofactor supports: " );
for ( v = nVars - 1; v >= 0; v-- )
{
Value = ((uSupp >> (2*v)) & 3);
if ( Value == 1 )
printf( "01" );
else if ( Value == 2 )
printf( "10" );
else if ( Value == 3 )
printf( "11" );
else
printf( "00" );
if ( v )
printf( "-" );
}
printf( "\n" );
}
// checks decomposability with respect to the pair (v, u)
static inline int Dau_Dsd6DecomposeDoubleVarsOne( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v, int u )
{
char pBuffer[10] = { 0 };
word tCof0 = Abc_Tt6Cofactor0( pTruth[0], v );
word tCof1 = Abc_Tt6Cofactor1( pTruth[0], v );
int Status = Dau_Dsd6FindSupportOne( p, tCof0, tCof1, pVars, nVars, v, u );
assert( v > u );
// Kit_DsdPrintFromTruth( (unsigned *)pTruth, 6 );printf( "\n" );
if ( Status == 3 )
{
// both F(v=0) and F(v=1) depend on u
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) && Abc_Tt6Cof0EqualCof1(tCof1, tCof0, u) ) // v+u
{
if ( !Abc_Tt6HasVar(tCof0, u) )
{
if ( Abc_Tt6HasVar(tCof1, u) )
{
uSupp1 |= (1 << u);
// F(v=0) does not depend on u; F(v=1) depends on u
if ( Abc_Tt6Cof0EqualCof0(tCof0, tCof1, u) ) // vu
{
sprintf( pBuffer, "(%c%c)", 'a' + pVars[v], 'a' + pVars[u] );
t = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof1, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
break;
}
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) ) // v!u
{
sprintf( pBuffer, "(%c!%c)", 'a' + pVars[v], 'a' + pVars[u] );
t = (s_Truths6[u] & Abc_Tt6Cofactor0(tCof1, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
break;
}
}
else assert( 0 ); // should depend on u
}
else
{
uSupp0 |= (1 << u);
if ( !Abc_Tt6HasVar(tCof1, u) )
{
// F(v=0) depends on u; F(v=1) does not depend on u
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) ) // !vu
{
sprintf( pBuffer, "(!%c%c)", 'a' + pVars[v], 'a' + pVars[u] );
t = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
break;
}
if ( Abc_Tt6Cof1EqualCof1(tCof0, tCof1, u) ) // !v!u
{
sprintf( pBuffer, "(!%c!%c)", 'a' + pVars[v], 'a' + pVars[u] );
t = (s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor1(tCof1, u));
break;
}
}
else
{
uSupp1 |= (1 << u);
// both F(v=0) and F(v=1) depend on u
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) && Abc_Tt6Cof0EqualCof1(tCof1, tCof0, u) ) // v+u
{
t = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
sprintf( pBuffer, "[%c%c]", 'a' + pVars[v], 'a' + pVars[u] );
break;
}
}
}
pTruth[0] = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
sprintf( pBuffer, "[%c%c]", 'a' + pVars[v], 'a' + pVars[u] );
goto finish;
}
// check if decomposition happened
if ( u >= 0 )
}
else if ( Status == 2 )
{
// F(v=0) does not depend on u; F(v=1) depends on u
if ( Abc_Tt6Cof0EqualCof0(tCof0, tCof1, u) ) // vu
{
// finalize decomposition
assert( pBuffer[0] != 0 );
pVars[u] = Dua_DsdAddVarDef( p, pBuffer );
pVars[v] = pVars[nVars-1];
Abc_TtSwapVars( &t, 6, v, nVars-1 );
nVars = Dau_Dsd6DecomposeConstCof( p, &t, pVars, --nVars );
v = Abc_MinInt( v, nVars - 1 ) + 1;
if ( nVars == 0 )
return;
continue;
sprintf( pBuffer, "(%c%c)", 'a' + pVars[v], 'a' + pVars[u] );
pTruth[0] = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof1, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
goto finish;
}
// check MUX decomposition w.r.t. u
if ( Abc_TtSuppOnlyOne( uSupp0 & ~uSupp1 ) && Abc_TtSuppOnlyOne( ~uSupp0 & uSupp1 ) )
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) ) // v!u
{
// check MUX
int iVar0 = Abc_TtSuppFindFirst( uSupp0 & ~uSupp1 );
int iVar1 = Abc_TtSuppFindFirst( ~uSupp0 & uSupp1 );
int iVarMin = Abc_MinInt( v, Abc_MinInt( iVar0, iVar1 ) );
int fEqual0, fEqual1;
word C00, C01, C10, C11;
// check existence conditions
if ( iVar0 > iVar1 )
ABC_SWAP( int, iVar0, iVar1 );
assert( iVar0 < iVar1 );
// fEqual0 = Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 0, 2 ) && Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 1, 3 );
// fEqual1 = Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 0, 3 ) && Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 1, 2 );
C00 = Abc_Tt6Cofactor0(tCof0, iVar0);
C01 = Abc_Tt6Cofactor1(tCof0, iVar0);
C10 = Abc_Tt6Cofactor0(tCof1, iVar1);
C11 = Abc_Tt6Cofactor1(tCof1, iVar1);
fEqual0 = (C00 == C10) && (C01 == C11);
fEqual1 = (C00 == C11) && (C01 == C10);
if ( fEqual0 || fEqual1 )
sprintf( pBuffer, "(%c!%c)", 'a' + pVars[v], 'a' + pVars[u] );
pTruth[0] = (s_Truths6[u] & Abc_Tt6Cofactor0(tCof1, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
goto finish;
}
}
else if ( Status == 1 )
{
// F(v=0) depends on u; F(v=1) does not depend on u
if ( Abc_Tt6Cof0EqualCof1(tCof0, tCof1, u) ) // !vu
{
sprintf( pBuffer, "(!%c%c)", 'a' + pVars[v], 'a' + pVars[u] );
pTruth[0] = (s_Truths6[u] & Abc_Tt6Cofactor1(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u));
goto finish;
}
if ( Abc_Tt6Cof1EqualCof1(tCof0, tCof1, u) ) // !v!u
{
sprintf( pBuffer, "(!%c!%c)", 'a' + pVars[v], 'a' + pVars[u] );
pTruth[0] = (s_Truths6[u] & Abc_Tt6Cofactor0(tCof0, u)) | (~s_Truths6[u] & Abc_Tt6Cofactor1(tCof1, u));
goto finish;
}
}
return nVars;
finish:
// finalize decomposition
assert( pBuffer[0] );
pVars[u] = Dau_DsdAddVarDef( p, pBuffer );
pVars[v] = pVars[nVars-1];
Abc_TtSwapVars( pTruth, 6, v, nVars-1 );
if ( Dau_Dsd6DecomposeSingleVarOne( p, pTruth, pVars, --nVars, u ) )
nVars = Dau_Dsd6DecomposeSingleVar( p, pTruth, pVars, --nVars );
return nVars;
}
int Dau_Dsd6DecomposeDoubleVars( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
while ( 1 )
{
int v, u, nVarsOld;
for ( v = nVars - 1; v > 0; v-- )
{
for ( u = v - 1; u >= 0; u-- )
{
assert( iVarMin < iVar0 && iVar0 < iVar1 );
t = (s_Truths6[iVarMin] & Abc_Tt6Cofactor0(tCof1, iVar1)) | (~s_Truths6[iVarMin] & Abc_Tt6Cofactor1(tCof1, iVar1));
if ( fEqual1 )
t = ~t;
sprintf( pBuffer, "<%c%c%c>", 'a' + pVars[v], 'a' + pVars[iVar1], 'a' + pVars[iVar0] );
pVars[iVarMin] = Dua_DsdAddVarDef( p, pBuffer );
pVars[iVar1] = pVars[nVars-1];
Abc_TtSwapVars( &t, 6, iVar1, nVars-1 );
pVars[iVar0] = pVars[nVars-2];
Abc_TtSwapVars( &t, 6, iVar0, nVars-2 );
nVars -= 2;
nVars = Dau_Dsd6DecomposeConstCof( p, &t, pVars, nVars );
v = Abc_MinInt( v, nVars - 1 ) + 1;
if ( Dau_DsdLookupVarCache( p, v, u ) )
continue;
nVarsOld = nVars;
nVars = Dau_Dsd6DecomposeDoubleVarsOne( p, pTruth, pVars, nVars, v, u );
if ( nVars == 0 )
return;
break;
return 0;
if ( nVarsOld > nVars )
break;
}
if ( u >= 0 ) // found
break;
}
if ( v == 0 ) // not found
break;
}
return nVars;
}
/*
// get the single variale cofactors
Kit_TruthCofactor0New( pCofs2[0], pTruth, pObj->nFans, i ); // tCof0
Kit_TruthCofactor1New( pCofs2[1], pTruth, pObj->nFans, i ); // tCof1
// get four cofactors
Kit_TruthCofactor0New( pCofs4[0][0], pCofs2[0], pObj->nFans, iLit0 ); // Abc_Tt6Cofactor0(tCof0, iLit0)
Kit_TruthCofactor1New( pCofs4[0][1], pCofs2[0], pObj->nFans, iLit0 ); // Abc_Tt6Cofactor1(tCof0, iLit0)
Kit_TruthCofactor0New( pCofs4[1][0], pCofs2[1], pObj->nFans, iLit1 ); // Abc_Tt6Cofactor0(tCof1, iLit1)
Kit_TruthCofactor1New( pCofs4[1][1], pCofs2[1], pObj->nFans, iLit1 ); // Abc_Tt6Cofactor1(tCof1, iLit1)
// check existence conditions
fEquals[0][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][0], pObj->nFans );
fEquals[0][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][1], pObj->nFans );
fEquals[1][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][1], pObj->nFans );
fEquals[1][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][0], pObj->nFans );
if ( (fEquals[0][0] && fEquals[0][1]) || (fEquals[1][0] && fEquals[1][1]) )
// look for MUX-decomposable variable on top or at the bottom
static inline int Dau_Dsd6DecomposeTripleVarsOuter( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v )
{
extern void Dau_DsdDecomposeInt( Dau_Dsd_t * p, word * pTruth, int nVarsInit );
Dau_Dsd_t P1, * p1 = &P1;
Dau_Dsd_t P2, * p2 = &P2;
word tCof0, tCof1;
// move this variable to the top
pVars[v] = pVars[nVars-1];
Abc_TtSwapVars( pTruth, 6, v, nVars-1 );
// cofactor w.r.t the last variable
tCof0 = Abc_Tt6Cofactor0( pTruth[0], nVars - 1 );
tCof1 = Abc_Tt6Cofactor1( pTruth[0], nVars - 1 );
// split decomposition
Dau_DsdDecomposeInt( p1, &tCof0, nVars - 1 );
Dau_DsdDecomposeInt( p2, &tCof1, nVars - 1 );
p->nSizeNonDec = Abc_MaxInt( p1->nSizeNonDec, p2->nSizeNonDec );
// compose the result
Dau_DsdWriteString( p, "<" );
Dau_DsdWriteVar( p, pVars[nVars - 1], 0 );
Dau_DsdTranslate( p, pVars, nVars - 1, p1->pOutput );
Dau_DsdTranslate( p, pVars, nVars - 1, p2->pOutput );
Dau_DsdWriteString( p, ">" );
return 0;
}
static inline int Dau_Dsd6DecomposeTripleVarsInner( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars, int v, unsigned uSupports )
{
int iVar0 = Abc_TtSuppFindFirst( uSupports & (~uSupports >> 1) & 0x55555555 ) >> 1;
int iVar1 = Abc_TtSuppFindFirst( ~uSupports & ( uSupports >> 1) & 0x55555555 ) >> 1;
word tCof0 = Abc_Tt6Cofactor0( pTruth[0], v );
word tCof1 = Abc_Tt6Cofactor1( pTruth[0], v );
word C00 = Abc_Tt6Cofactor0( tCof0, iVar0 );
word C01 = Abc_Tt6Cofactor1( tCof0, iVar0 );
word C10 = Abc_Tt6Cofactor0( tCof1, iVar1 );
word C11 = Abc_Tt6Cofactor1( tCof1, iVar1 );
int fEqual0 = (C00 == C10) && (C01 == C11);
int fEqual1 = (C00 == C11) && (C01 == C10);
// assert( iVar0 < iVar1 );
// fEqual0 = Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 0, 2 ) && Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 1, 3 );
// fEqual1 = Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 0, 3 ) && Abc_TtCheckEqualCofs( &t, 1, iVar0, iVar1, 1, 2 );
if ( fEqual0 || fEqual1 )
{
char pBuffer[10];
int iVarMin = Abc_MinInt( v, Abc_MinInt( iVar0, iVar1 ) );
// assert( iVarMin < iVar0 && iVar0 < iVar1 );
pTruth[0] = (s_Truths6[iVarMin] & Abc_Tt6Cofactor0(tCof1, iVar1)) | (~s_Truths6[iVarMin] & Abc_Tt6Cofactor1(tCof1, iVar1));
if ( fEqual1 )
pTruth[0] = ~pTruth[0];
sprintf( pBuffer, "<%c%c%c>", 'a' + pVars[v], 'a' + pVars[iVar1], 'a' + pVars[iVar0] );
pVars[iVarMin] = Dau_DsdAddVarDef( p, pBuffer );
pVars[iVar1] = pVars[nVars-1];
Abc_TtSwapVars( pTruth, 6, iVar1, nVars-1 );
pVars[iVar0] = pVars[nVars-2];
Abc_TtSwapVars( pTruth, 6, iVar0, nVars-2 );
nVars -= 2;
return Dau_Dsd6DecomposeSingleVar( p, pTruth, pVars, nVars );
}
return nVars;
}
int Dau_Dsd6DecomposeTripleVars( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
while ( 1 )
{
int v;
for ( v = nVars - 1; v >= 0; v-- )
{
unsigned uSupports = Dau_Dsd6FindSupports( p, pTruth, pVars, nVars, v );
Dau_DsdPrintSupports( uSupports, nVars );
if ( (uSupports & (uSupports >> 1) & 0x55555555) == 0 ) // non-overlapping supports
return Dau_Dsd6DecomposeTripleVarsOuter( p, pTruth, pVars, nVars, v );
if ( Abc_TtSuppOnlyOne( uSupports & (~uSupports >> 1) & 0x55555555) ||
Abc_TtSuppOnlyOne(~uSupports & ( uSupports >> 1) & 0x55555555) ) // one unique variable in each cofactor
{
// construct the MUX
pRes = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, 3 );
Kit_DsdObjTruth(pRes)[0] = 0xCACACACA;
pRes->nRefs++;
pRes->nFans = 3;
pRes->pFans[0] = pObj->pFans[iLit0]; pObj->pFans[iLit0] = 127; uSupp &= ~(1 << iLit0);
pRes->pFans[1] = pObj->pFans[iLit1]; pObj->pFans[iLit1] = 127; uSupp &= ~(1 << iLit1);
pRes->pFans[2] = pObj->pFans[i]; pObj->pFans[i] = 2 * pRes->Id; // remains in support
// update the node
// if ( fEquals[0][0] && fEquals[0][1] )
// Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[0][1], pObj->nFans, i );
// else
// Kit_TruthMuxVar( pTruth, pCofs4[0][1], pCofs4[0][0], pObj->nFans, i );
Kit_TruthMuxVar( pTruth, pCofs4[1][0], pCofs4[1][1], pObj->nFans, i );
if ( fEquals[1][0] && fEquals[1][1] )
pRes->pFans[0] = Abc_LitNot(pRes->pFans[0]);
// decompose the remainder
Kit_DsdDecompose_rec( pNtk, pObj, uSupp, pPar, nDecMux );
return;
nVars = Dau_Dsd6DecomposeTripleVarsInner( p, pTruth, pVars, nVars, v, uSupports );
if ( nVars == 0 )
return 0;
nVars = Dau_Dsd6DecomposeDoubleVars( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return 0;
break;
}
*/
}
if ( v == -1 )
return nVars;
}
assert( 0 );
return -1;
}
void Dau_Dsd6DecomposeInternal( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
// decompose single variales on the output side
nVars = Dau_Dsd6DecomposeSingleVar( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// decompose double variables on the input side
nVars = Dau_Dsd6DecomposeDoubleVars( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// decompose MUX on the output/input side
nVars = Dau_Dsd6DecomposeTripleVars( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// write non-decomposable function
Dau_DsdWritePrime( p, pTruth, pVars, nVars );
}
/**Function*************************************************************
Synopsis [Procedures specialized for 6-variable functions.]
/*
// check MUX decomposition w.r.t. u
if ( (uSupp0 & uSupp1) == 0 )
{
// perform MUX( v, F(v=1), F(v=0) )
}
*/
}
// this non-DSD-decomposable function
assert( nVars > 2 );
// write truth table
p->nPos += Abc_TtWriteHexRev( p->pOutput + p->nPos, &t, nVars );
Dua_DsdWrite( p, "{" );
for ( v = 0; v < nVars; v++ )
Dua_DsdWriteVar( p, pVars[v], 0 );
Dua_DsdWrite( p, "}" );
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Dau_DsdDecomposeSingleVar( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
return 0;
}
int Dau_DsdDecomposeDoubleVars( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
return 0;
}
int Dau_DsdDecomposeTripleVars( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
return 0;
}
void Dau_DsdDecomposeInternal( Dau_Dsd_t * p, word * pTruth, int * pVars, int nVars )
{
// decompose single variales on the output side
nVars = Dau_DsdDecomposeSingleVar( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// decompose double variables on the input side
nVars = Dau_DsdDecomposeDoubleVars( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// decompose MUX on the output/input side
nVars = Dau_DsdDecomposeTripleVars( p, pTruth, pVars, nVars );
if ( nVars == 0 )
return;
// write non-decomposable function
Dau_DsdWritePrime( p, pTruth, pVars, nVars );
}
char * Dau_DsdDecompose( word * pTruth, int nVarsInit )
/**Function*************************************************************
Synopsis [Fast DSD for truth tables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Dau_DsdDecomposeInt( Dau_Dsd_t * p, word * pTruth, int nVarsInit )
{
Dau_Dsd_t P, * p = &P;
int nVars, pVars[16];
Dua_DsdInit( p, nVarsInit );
Dau_DsdInitialize( p, nVarsInit );
nVars = Dau_DsdMinBase( pTruth, nVarsInit, pVars );
assert( nVars > 0 && nVars <= 6 );
if ( nVars == 1 )
Dau_DsdWriteVar( p, pVars[0], (int)(pTruth[0] & 1) );
else if ( nVars <= 6 )
Dau_Dsd6DecomposeInternal( p, pTruth, pVars, nVars );
else
Dau_DsdDecomposeInternal( p, pTruth, pVars, nVars );
Dau_DsdFinalize( p );
}
char * Dau_DsdDecompose( word * pTruth, int nVarsInit, int * pnSizeNonDec )
{
static Dau_Dsd_t P;
Dau_Dsd_t * p = &P;
if ( (pTruth[0] & 1) == 0 && Abc_TtIsConst0(pTruth, Abc_TtWordNum(nVarsInit)) )
Dua_DsdWrite( p, "0" );
p->pOutput[0] = '0', p->pOutput[1] = 0;
else if ( (pTruth[0] & 1) && Abc_TtIsConst1(pTruth, Abc_TtWordNum(nVarsInit)) )
Dua_DsdWrite( p, "1" );
p->pOutput[0] = '1', p->pOutput[1] = 0;
else
{
nVars = Dua_DsdMinBase( pTruth, nVarsInit, pVars );
assert( nVars > 0 && nVars <= 6 );
if ( nVars == 1 )
Dua_DsdWriteVar( p, pVars[0], (int)(pTruth[0] & 1) );
else if ( nVars <= 6 )
Dau_Dsd6DecomposeInternal( p, pTruth[0], pVars, nVars );
else
Dau_DsdDecomposeInternal( p, pTruth, pVars, nVars );
Dau_DsdDecomposeInt( p, pTruth, nVarsInit );
Dau_DsdCleanBraces( p->pOutput );
if ( pnSizeNonDec )
*pnSizeNonDec = p->nSizeNonDec;
}
Dua_DsdWriteStop( p );
Dau_DsdCleanBraces( p->pOutput );
return p->pOutput;
}
void Dau_DsdTest()
{
// char * pStr = "(!(!a<bcd>)!(!fe))";
char * pStr = "<cba>";
// char * pStr = "<cba>";
// char * pStr = "!(f!(b!c!(d[ea])))";
char * pStr = "[!(a[be])!(c!df)]";
char * pStr2;
word t = Dau_DsdToTruth( pStr );
return;
pStr2 = Dau_DsdDecompose( &t, 6 );
pStr2 = Dau_DsdDecompose( &t, 6, NULL );
t = 0;
}
......
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