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Commit 0fafe786 by Alan Mishchenko
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Improvements to the truth table computations.

parent 77fde55b
Showing with 111 additions and 162 deletions
abclib.dsp
......@@ -1975,6 +1975,10 @@ SOURCE=.\src\opt\dau\dau.c
# End Source File
# Begin Source File
SOURCE=.\src\opt\dau\dauCanon.c
# End Source File
# Begin Source File
SOURCE=.\src\opt\dau\dauCore.c
# End Source File
# Begin Source File
......
src/base/abci/abcNpn.c
......@@ -202,8 +202,10 @@ void Abc_TruthNpnPerform( Abc_TtStore_t * p, int NpnType, int fVerbose )
{
for ( i = 0; i < p->nFuncs; i++ )
{
extern void Abc_TtConfactorTest( word * pTruth, int nVars, int i );
if ( fVerbose )
printf( "%7d : ", i );
Abc_TtConfactorTest( p->pFuncs[i], p->nVars, i );
if ( fVerbose )
Extra_PrintHex( stdout, (unsigned *)p->pFuncs[i], p->nVars ), printf( "\n" );
}
......
src/misc/extra/extra.h
......@@ -119,6 +119,7 @@ extern int Extra_ReadHexadecimal( unsigned Sign[], char * pString, int
extern void Extra_PrintHexadecimal( FILE * pFile, unsigned Sign[], int nVars );
extern void Extra_PrintHexadecimalString( char * pString, unsigned Sign[], int nVars );
extern void Extra_PrintHex( FILE * pFile, unsigned * pTruth, int nVars );
extern void Extra_PrintHexReverse( FILE * pFile, unsigned * pTruth, int nVars );
extern void Extra_PrintSymbols( FILE * pFile, char Char, int nTimes, int fPrintNewLine );
/*=== extraUtilReader.c ========================================================*/
......
src/misc/extra/extraUtilFile.c
......@@ -561,6 +561,24 @@ void Extra_PrintHex( FILE * pFile, unsigned * pTruth, int nVars )
}
// fprintf( pFile, "\n" );
}
void Extra_PrintHexReverse( FILE * pFile, unsigned * pTruth, int nVars )
{
int nMints, nDigits, Digit, k;
// write the number into the file
fprintf( pFile, "0x" );
nMints = (1 << nVars);
nDigits = nMints / 4;
for ( k = 0; k < nDigits; k++ )
{
Digit = ((pTruth[k/8] >> (k * 4)) & 15);
if ( Digit < 10 )
fprintf( pFile, "%d", Digit );
else
fprintf( pFile, "%c", 'A' + Digit-10 );
}
// fprintf( pFile, "\n" );
}
/**Function*************************************************************
......
src/misc/util/abc_global.h
......@@ -198,6 +198,7 @@ typedef unsigned __int64 ABC_UINT64_T;
#endif /* defined(PLATFORM) */
typedef ABC_UINT64_T word;
typedef ABC_INT64_T iword;
////////////////////////////////////////////////////////////////////////
/// MACRO DEFINITIONS ///
......
src/opt/dau/dauDsd.c
......@@ -478,163 +478,6 @@ void Dau_DsdTestOne( word t, int i )
SeeAlso []
***********************************************************************/
static inline int Abc_TtTruthIsConst0( word * p, int nWords ) { int w; for ( w = 0; w < nWords; w++ ) if ( p[w] != 0 ) return 0; return 1; }
static inline int Abc_TtTruthIsConst1( word * p, int nWords ) { int w; for ( w = 0; w < nWords; w++ ) if ( p[w] != ~(word)0 ) return 0; return 1; }
static inline int Abc_TtCof0IsConst0( word * t, int nWords, int iVar )
{
if ( iVar < 6 )
{
int i;
for ( i = 0; i < nWords; i++ )
if ( t[i] & ~s_Truths6[iVar] )
return 0;
return 1;
}
else
{
int i, Step = (1 << (iVar - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i] )
return 0;
return 1;
}
}
static inline int Abc_TtCof0IsConst1( word * t, int nWords, int iVar )
{
if ( iVar < 6 )
{
int i;
for ( i = 0; i < nWords; i++ )
if ( (t[i] & ~s_Truths6[iVar]) != ~s_Truths6[iVar] )
return 0;
return 1;
}
else
{
int i, Step = (1 << (iVar - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i] != ~(word)0 )
return 0;
return 1;
}
}
static inline int Abc_TtCof1IsConst0( word * t, int nWords, int iVar )
{
if ( iVar < 6 )
{
int i;
for ( i = 0; i < nWords; i++ )
if ( t[i] & s_Truths6[iVar] )
return 0;
return 1;
}
else
{
int i, Step = (1 << (iVar - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i+Step] )
return 0;
return 1;
}
}
static inline int Abc_TtCof1IsConst1( word * t, int nWords, int iVar )
{
if ( iVar < 6 )
{
int i;
for ( i = 0; i < nWords; i++ )
if ( (t[i] & s_Truths6[iVar]) != s_Truths6[iVar] )
return 0;
return 1;
}
else
{
int i, Step = (1 << (iVar - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i+Step] != ~(word)0 )
return 0;
return 1;
}
}
static inline int Abc_TtCofsOpposite( word * t, int nWords, int iVar )
{
if ( iVar < 6 )
{
int i, Shift = (1 << iVar);
for ( i = 0; i < nWords; i++ )
if ( ((t[i] << Shift) & s_Truths6[iVar]) != (~t[i] & s_Truths6[iVar]) )
return 0;
return 1;
}
else
{
int i, Step = (1 << (iVar - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i] != ~t[i+Step] )
return 0;
return 1;
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Abc_TtCof0HasVar( word * t, int nWords, int iVarI, int iVarJ )
{
assert( iVarI > iVarJ );
if ( iVarI < 6 )
{
int i, Shift = (1 << iVarJ);
for ( i = 0; i < nWords; i++ )
if ( (((t[i] & ~s_Truths6[iVarI]) << Shift) & s_Truths6[iVarJ]) != ((t[i] & ~s_Truths6[iVarI]) & s_Truths6[iVarJ]) )
return 0;
return 1;
}
else if ( iVarI == 6 )
{
}
else
{
int i, Step = (1 << (iVarJ - 6));
word * tLimit = t + nWords;
for ( ; t < tLimit; t += 2*Step )
for ( i = 0; i < Step; i++ )
if ( t[i] != t[i+Step] )
return 0;
return 1;
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Dau_DsdMinimize( word * p, int * pVars, int nVars )
{
int i, k;
......@@ -683,16 +526,18 @@ int Dau_DsdRun6_rec( word * p, int * pVars, int nVars, char * pBuffer, int Pos,
***********************************************************************/
int Dau_DsdRun_rec( word * p, int * pVars, int nVars, char * pBuffer, int Pos, char pStore[16][16], int Func )
{
int v, nWords = Abc_TtWordNum( nVars );
int v, u, nWords = Abc_TtWordNum( nVars );
nVars = Dau_DsdMinimize( p, pVars, nVars );
if ( nVars <= 6 )
return Dau_DsdRun6_rec( p, pVars, nVars, pBuffer, Pos, pStore, Func );
// consider negative cofactors
if ( p[0] & 1 )
{
// check for !(ax)
for ( v = 0; v < nVars; v++ )
if ( Abc_TtCof0IsConst0( p, nWords, v ) )
if ( Abc_TtCof0IsConst1( p, nWords, v ) )
{
pBuffer[Pos++] = '!';
pBuffer[Pos++] = '(';
pBuffer[Pos++] = 'a' + pVars[v];
Abc_TtSwapVars( p, nVars, v, nVars - 1 );
......@@ -706,9 +551,8 @@ int Dau_DsdRun_rec( word * p, int * pVars, int nVars, char * pBuffer, int Pos, c
{
// check for ax
for ( v = 0; v < nVars; v++ )
if ( Abc_TtCof0IsConst1( p, nWords, v ) )
if ( Abc_TtCof0IsConst0( p, nWords, v ) )
{
pBuffer[Pos++] = '!';
pBuffer[Pos++] = '(';
pBuffer[Pos++] = 'a' + pVars[v];
Abc_TtSwapVars( p, nVars, v, nVars - 1 );
......@@ -718,6 +562,7 @@ int Dau_DsdRun_rec( word * p, int * pVars, int nVars, char * pBuffer, int Pos, c
return Pos;
}
}
// consider positive cofactors
if ( (p[nWords-1] >> 63) & 1 )
{
// check for !(!ax)
......@@ -764,7 +609,85 @@ int Dau_DsdRun_rec( word * p, int * pVars, int nVars, char * pBuffer, int Pos, c
return Pos;
}
return 0;
// consider two-variable cofactors
for ( v = nVars - 1; v > 0; v-- )
{
unsigned uSupp0 = 0, uSupp1 = 0;
for ( u = v - 1; u >= 0; u-- )
{
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 0, 1 ) )
{
uSupp0 |= (1 << u);
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 2, 3 ) )
{
uSupp1 |= (1 << u);
// check XOR decomposition
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 0, 3 ) && Abc_TtCheckEqualCofs( p, nWords, u, v, 1, 2 ) )
{
// perform XOR (u, v)
return Pos;
}
}
else
{
// F(v=0) does not depend on u; F(v=1) depends on u
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 0, 2 ) )
{
// perform AND (u, v)
return Pos;
}
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 0, 3 ) )
{
// perform AND (u, v)
return Pos;
}
}
}
else if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 2, 3 ) )
{
uSupp1 |= (1 << u);
// F(v=0) depends on u; F(v=1) does not depend on u
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 0, 2 ) )
{
// perform AND (u, v)
return Pos;
}
if ( Abc_TtCheckEqualCofs( p, nWords, u, v, 1, 2 ) )
{
// perform AND (u, v)
return Pos;
}
}
else assert( 0 );
}
// check MUX decomposition w.r.t. u
if ( (uSupp0 & uSupp1) == 0 )
{
// perform MUX( v, F(v=1), F(v=0) )
}
// check MUX decomposition w.r.t. u
if ( Abc_TtSuppOnlyOne( uSupp0 & ~uSupp1 ) && Abc_TtSuppOnlyOne( ~uSupp0 & uSupp1 ) )
{
// check MUX
int iVar0 = Abc_TtSuppFindFirst( uSupp0 );
int iVar1 = Abc_TtSuppFindFirst( uSupp1 );
int fEqual0, fEqual1;
if ( iVar0 > iVar1 )
ABC_SWAP( int, iVar0, iVar1 );
// check existence conditions
assert( iVar0 < iVar1 );
fEqual0 = Abc_TtCheckEqualCofs( p, nWords, iVar0, iVar1, 0, 2 ) && Abc_TtCheckEqualCofs( p, nWords, iVar0, iVar1, 1, 3 );
fEqual1 = Abc_TtCheckEqualCofs( p, nWords, iVar0, iVar1, 0, 3 ) && Abc_TtCheckEqualCofs( p, nWords, iVar0, iVar1, 1, 2 );
if ( fEqual0 || fEqual1 )
{
// perform MUX( v, F(v=1), F(v=0) )
return Pos;
}
}
}
return Pos;
}
......
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