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Commit 3f35ac81 by Alan Mishchenko
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New command 'lutexact'.

parent e5d83352
Showing with 857 additions and 5 deletions
src/base/abci/abc.c
......@@ -151,6 +151,7 @@ static int Abc_CommandBmsStop ( Abc_Frame_t * pAbc, int argc, cha
static int Abc_CommandBmsPs ( Abc_Frame_t * pAbc, int argc, char ** argv );
static int Abc_CommandMajExact ( Abc_Frame_t * pAbc, int argc, char ** argv );
static int Abc_CommandTwoExact ( Abc_Frame_t * pAbc, int argc, char ** argv );
static int Abc_CommandLutExact ( Abc_Frame_t * pAbc, int argc, char ** argv );
static int Abc_CommandLogic ( Abc_Frame_t * pAbc, int argc, char ** argv );
static int Abc_CommandComb ( Abc_Frame_t * pAbc, int argc, char ** argv );
......@@ -819,6 +820,7 @@ void Abc_Init( Abc_Frame_t * pAbc )
Cmd_CommandAdd( pAbc, "Exact synthesis", "bms_ps", Abc_CommandBmsPs, 0 );
Cmd_CommandAdd( pAbc, "Exact synthesis", "majexact", Abc_CommandMajExact, 0 );
Cmd_CommandAdd( pAbc, "Exact synthesis", "twoexact", Abc_CommandTwoExact, 0 );
Cmd_CommandAdd( pAbc, "Exact synthesis", "lutexact", Abc_CommandLutExact, 0 );
Cmd_CommandAdd( pAbc, "Various", "logic", Abc_CommandLogic, 1 );
Cmd_CommandAdd( pAbc, "Various", "comb", Abc_CommandComb, 1 );
......@@ -8258,6 +8260,108 @@ usage:
SeeAlso []
***********************************************************************/
int Abc_CommandLutExact( Abc_Frame_t * pAbc, int argc, char ** argv )
{
extern void Exa3_ManExactSynthesis( char * pTtStr, int nVars, int nNodes, int nLutSize, int fVerbose );
extern void Exa3_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int nLutSize, int fVerbose );
int c, nVars = 5, nNodes = 5, nLutSize = 3, fGlucose = 0, fVerbose = 1; char * pTtStr = NULL;
Extra_UtilGetoptReset();
while ( ( c = Extra_UtilGetopt( argc, argv, "INKgvh" ) ) != EOF )
{
switch ( c )
{
case 'I':
if ( globalUtilOptind >= argc )
{
Abc_Print( -1, "Command line switch \"-I\" should be followed by an integer.\n" );
goto usage;
}
nVars = atoi(argv[globalUtilOptind]);
globalUtilOptind++;
if ( nVars < 0 )
goto usage;
break;
case 'N':
if ( globalUtilOptind >= argc )
{
Abc_Print( -1, "Command line switch \"-N\" should be followed by an integer.\n" );
goto usage;
}
nNodes = atoi(argv[globalUtilOptind]);
globalUtilOptind++;
if ( nNodes < 0 )
goto usage;
break;
case 'K':
if ( globalUtilOptind >= argc )
{
Abc_Print( -1, "Command line switch \"-K\" should be followed by an integer.\n" );
goto usage;
}
nLutSize = atoi(argv[globalUtilOptind]);
globalUtilOptind++;
if ( nLutSize < 0 )
goto usage;
break;
case 'g':
fGlucose ^= 1;
break;
case 'v':
fVerbose ^= 1;
break;
case 'h':
goto usage;
default:
goto usage;
}
}
if ( argc == globalUtilOptind + 1 )
pTtStr = argv[globalUtilOptind];
if ( pTtStr == NULL )
{
Abc_Print( -1, "Truth table should be given on the command line.\n" );
return 1;
}
if ( nVars > 10 )
{
Abc_Print( -1, "Function should not have more than 10 inputs.\n" );
return 1;
}
if ( nLutSize > 6 )
{
Abc_Print( -1, "Node size should not be more than 6 inputs.\n" );
return 1;
}
if ( fGlucose )
Exa3_ManExactSynthesis( pTtStr, nVars, nNodes, nLutSize, fVerbose );
else
Exa3_ManExactSynthesis2( pTtStr, nVars, nNodes, nLutSize, fVerbose );
return 0;
usage:
Abc_Print( -2, "usage: lutexact [-INK <num>] [-fcgvh] <hex>\n" );
Abc_Print( -2, "\t exact synthesis of multi-input function using two-input gates\n" );
Abc_Print( -2, "\t-I <num> : the number of input variables [default = %d]\n", nVars );
Abc_Print( -2, "\t-N <num> : the number of K-input nodes [default = %d]\n", nNodes );
Abc_Print( -2, "\t-K <num> : the number of node fanins [default = %d]\n", nLutSize );
Abc_Print( -2, "\t-g : toggle using Glucose 3.0 by Gilles Audemard and Laurent Simon [default = %s]\n", fGlucose ? "yes" : "no" );
Abc_Print( -2, "\t-v : toggle verbose printout [default = %s]\n", fVerbose ? "yes" : "no" );
Abc_Print( -2, "\t-h : print the command usage\n" );
Abc_Print( -2, "\t<hex> : truth table in hex notation\n" );
return 1;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_CommandLogic( Abc_Frame_t * pAbc, int argc, char ** argv )
{
Abc_Ntk_t * pNtk, * pNtkRes;
src/sat/bmc/bmcMaj.c
......@@ -118,7 +118,7 @@ int Maj_ManMarkup( Maj_Man_t * p )
}
}
}
//printf( "The number of parameter variables = %d.\n", p->iVar );
printf( "The number of parameter variables = %d.\n", p->iVar );
return p->iVar;
// printout
for ( i = p->nVars + 2; i < p->nObjs; i++ )
......@@ -445,7 +445,7 @@ int Exa_ManMarkup( Exa_Man_t * p )
}
}
}
//printf( "The number of parameter variables = %d.\n", p->iVar );
printf( "The number of parameter variables = %d.\n", p->iVar );
return p->iVar;
// printout
for ( i = p->nVars; i < p->nObjs; i++ )
......@@ -736,6 +736,375 @@ void Exa_ManExactSynthesis( char * pTtStr, int nVars, int nNodes, int fVerbose )
Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
}
typedef struct Exa3_Man_t_ Exa3_Man_t;
struct Exa3_Man_t_
{
int nVars; // inputs
int nNodes; // internal nodes
int nLutSize; // lut size
int LutMask; // lut mask
int nObjs; // total objects (nVars inputs + nNodes internal nodes)
int nWords; // the truth table size in 64-bit words
int iVar; // the next available SAT variable
word * pTruth; // truth table
Vec_Wrd_t * vInfo; // nVars + nNodes + 1
int VarMarks[MAJ_NOBJS][6][MAJ_NOBJS]; // variable marks
int VarVals[MAJ_NOBJS]; // values of the first nVars variables
Vec_Wec_t * vOutLits; // output vars
bmcg_sat_solver * pSat; // SAT solver
};
static inline word * Exa3_ManTruth( Exa3_Man_t * p, int v ) { return Vec_WrdEntryP( p->vInfo, p->nWords * v ); }
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static Vec_Wrd_t * Exa3_ManTruthTables( Exa3_Man_t * p )
{
Vec_Wrd_t * vInfo = p->vInfo = Vec_WrdStart( p->nWords * (p->nObjs+1) ); int i;
for ( i = 0; i < p->nVars; i++ )
Abc_TtIthVar( Exa3_ManTruth(p, i), i, p->nVars );
//Dau_DsdPrintFromTruth( Exa3_ManTruth(p, p->nObjs), p->nVars );
return vInfo;
}
static int Exa3_ManMarkup( Exa3_Man_t * p )
{
int i, k, j;
assert( p->nObjs <= MAJ_NOBJS );
// assign variables for truth tables
p->iVar = 1 + p->LutMask * p->nNodes;
for ( i = p->nVars; i < p->nObjs; i++ )
{
for ( k = 0; k < p->nLutSize; k++ )
{
for ( j = 0; j < i - k; j++ )
{
Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) );
p->VarMarks[i][k][j] = p->iVar++;
}
}
}
printf( "The number of parameter variables = %d.\n", p->iVar );
return p->iVar;
// printout
for ( i = p->nVars; i < p->nObjs; i++ )
{
printf( "Node %d\n", i );
for ( j = 0; j < p->nObjs; j++ )
{
for ( k = 0; k < p->nLutSize; k++ )
printf( "%3d ", p->VarMarks[i][k][j] );
printf( "\n" );
}
}
return p->iVar;
}
static Exa3_Man_t * Exa3_ManAlloc( int nVars, int nNodes, int nLutSize, word * pTruth )
{
Exa3_Man_t * p = ABC_CALLOC( Exa3_Man_t, 1 );
p->nVars = nVars;
p->nNodes = nNodes;
p->nLutSize = nLutSize;
p->LutMask = (1 << nLutSize) - 1;
p->nObjs = nVars + nNodes;
p->nWords = Abc_TtWordNum(nVars);
p->pTruth = pTruth;
p->vOutLits = Vec_WecStart( p->nObjs );
p->iVar = Exa3_ManMarkup( p );
p->vInfo = Exa3_ManTruthTables( p );
p->pSat = bmcg_sat_solver_start();
bmcg_sat_solver_set_nvars( p->pSat, p->iVar );
return p;
}
static void Exa3_ManFree( Exa3_Man_t * p )
{
bmcg_sat_solver_stop( p->pSat );
Vec_WrdFree( p->vInfo );
Vec_WecFree( p->vOutLits );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Exa3_ManFindFanin( Exa3_Man_t * p, int i, int k )
{
int j, Count = 0, iVar = -1;
for ( j = 0; j < p->nObjs; j++ )
if ( p->VarMarks[i][k][j] && bmcg_sat_solver_read_cex_varvalue(p->pSat, p->VarMarks[i][k][j]) )
{
iVar = j;
Count++;
}
assert( Count == 1 );
return iVar;
}
static inline int Exa3_ManEval( Exa3_Man_t * p )
{
static int Flag = 0;
int i, k, j, iMint; word * pFanins[6];
for ( i = p->nVars; i < p->nObjs; i++ )
{
int iVarStart = 1 + p->LutMask*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
pFanins[k] = Exa3_ManTruth( p, Exa3_ManFindFanin(p, i, k) );
Abc_TtConst0( Exa3_ManTruth(p, i), p->nWords );
for ( k = 1; k <= p->LutMask; k++ )
{
if ( !bmcg_sat_solver_read_cex_varvalue(p->pSat, iVarStart+k-1) )
continue;
// Abc_TtAndCompl( Exa3_ManTruth(p, p->nObjs), pFanins[0], !(k&1), pFanins[1], !(k>>1), p->nWords );
Abc_TtConst1( Exa3_ManTruth(p, p->nObjs), p->nWords );
for ( j = 0; j < p->nLutSize; j++ )
Abc_TtAndCompl( Exa3_ManTruth(p, p->nObjs), Exa3_ManTruth(p, p->nObjs), 0, pFanins[j], !((k >> j) & 1), p->nWords );
Abc_TtOr( Exa3_ManTruth(p, i), Exa3_ManTruth(p, i), Exa3_ManTruth(p, p->nObjs), p->nWords );
}
}
if ( Flag && p->nVars >= 6 )
iMint = Abc_TtFindLastDiffBit( Exa3_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars );
else
iMint = Abc_TtFindFirstDiffBit( Exa3_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars );
//Flag ^= 1;
assert( iMint < (1 << p->nVars) );
return iMint;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static void Exa3_ManPrintSolution( Exa3_Man_t * p, int fCompl )
{
int i, k, iVar;
printf( "Realization of given %d-input function using %d %d-input LUTs:\n", p->nVars, p->nNodes, p->nLutSize );
for ( i = p->nObjs - 1; i >= p->nVars; i-- )
{
int Val, iVarStart = 1 + p->LutMask*(i - p->nVars);
printf( "%02d = %d\'b", i, 1 << p->nLutSize );
for ( k = p->LutMask - 1; k >= 0; k-- )
{
Val = bmcg_sat_solver_read_cex_varvalue(p->pSat, iVarStart+k);
if ( i == p->nObjs - 1 && fCompl )
printf( "%d", !Val );
else
printf( "%d", Val );
}
if ( i == p->nObjs - 1 && fCompl )
printf( "1(" );
else
printf( "0(" );
for ( k = p->nLutSize - 1; k >= 0; k-- )
{
iVar = Exa3_ManFindFanin( p, i, k );
if ( iVar >= 0 && iVar < p->nVars )
printf( " %c", 'a'+iVar );
else
printf( " %02d", iVar );
}
printf( " )\n" );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static int Exa3_ManAddCnfStart( Exa3_Man_t * p )
{
int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m;
// input constraints
for ( i = p->nVars; i < p->nObjs; i++ )
{
int iVarStart = 1 + p->LutMask*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
{
int nLits = 0;
for ( j = 0; j < p->nObjs; j++ )
if ( p->VarMarks[i][k][j] )
pLits[nLits++] = Abc_Var2Lit( p->VarMarks[i][k][j], 0 );
assert( nLits > 0 );
// input uniqueness
if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) )
return 0;
for ( n = 0; n < nLits; n++ )
for ( m = n+1; m < nLits; m++ )
{
pLits2[0] = Abc_LitNot(pLits[n]);
pLits2[1] = Abc_LitNot(pLits[m]);
if ( !bmcg_sat_solver_addclause( p->pSat, pLits2, 2 ) )
return 0;
}
if ( k == p->nLutSize - 1 )
break;
// symmetry breaking
for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] )
for ( n = j; n < p->nObjs; n++ ) if ( p->VarMarks[i][k+1][n] )
{
pLits2[0] = Abc_Var2Lit( p->VarMarks[i][k][j], 1 );
pLits2[1] = Abc_Var2Lit( p->VarMarks[i][k+1][n], 1 );
if ( !bmcg_sat_solver_addclause( p->pSat, pLits2, 2 ) )
return 0;
}
}
if ( p->nLutSize != 2 )
continue;
// two-input functions
for ( k = 0; k < 3; k++ )
{
pLits[0] = Abc_Var2Lit( iVarStart, k==1 );
pLits[1] = Abc_Var2Lit( iVarStart+1, k==2 );
pLits[2] = Abc_Var2Lit( iVarStart+2, k!=0 );
if ( !bmcg_sat_solver_addclause( p->pSat, pLits, 3 ) )
return 0;
}
}
// outputs should be used
for ( i = 0; i < p->nObjs - 1; i++ )
{
Vec_Int_t * vArray = Vec_WecEntry(p->vOutLits, i);
assert( Vec_IntSize(vArray) > 0 );
if ( !bmcg_sat_solver_addclause( p->pSat, Vec_IntArray(vArray), Vec_IntSize(vArray) ) )
return 0;
}
return 1;
}
static int Exa3_ManAddCnf( Exa3_Man_t * p, int iMint )
{
// save minterm values
int i, k, n, j, Value = Abc_TtGetBit(p->pTruth, iMint);
for ( i = 0; i < p->nVars; i++ )
p->VarVals[i] = (iMint >> i) & 1;
// sat_solver_setnvars( p->pSat, p->iVar + (p->nLutSize+1)*p->nNodes );
bmcg_sat_solver_set_nvars( p->pSat, p->iVar + (p->nLutSize+1)*p->nNodes );
//printf( "Adding clauses for minterm %d with value %d.\n", iMint, Value );
for ( i = p->nVars; i < p->nObjs; i++ )
{
// fanin connectivity
int iVarStart = 1 + p->LutMask*(i - p->nVars);
int iBaseSatVarI = p->iVar + (p->nLutSize+1)*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
{
for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] )
{
int iBaseSatVarJ = p->iVar + (p->nLutSize+1)*(j - p->nVars);
for ( n = 0; n < 2; n++ )
{
int pLits[3], nLits = 0;
pLits[nLits++] = Abc_Var2Lit( p->VarMarks[i][k][j], 1 );
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + k, n );
if ( j >= p->nVars )
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarJ + p->nLutSize, !n );
else if ( p->VarVals[j] == n )
continue;
if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) )
return 0;
}
}
}
// node functionality
for ( n = 0; n < 2; n++ )
{
if ( i == p->nObjs - 1 && n == Value )
continue;
for ( k = 0; k <= p->LutMask; k++ )
{
int pLits[8], nLits = 0;
if ( k == 0 && n == 1 )
continue;
//pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 0, (k&1) );
//pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 1, (k>>1) );
//if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 2, !n );
for ( j = 0; j < p->nLutSize; j++ )
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + j, (k >> j) & 1 );
if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + j, !n );
if ( k > 0 ) pLits[nLits++] = Abc_Var2Lit( iVarStart + k-1, n );
assert( nLits <= p->nLutSize+2 );
if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) )
return 0;
}
}
}
p->iVar += (p->nLutSize+1)*p->nNodes;
return 1;
}
void Exa3_ManExactSynthesis( char * pTtStr, int nVars, int nNodes, int nLutSize, int fVerbose )
{
int i, status, iMint = 1;
abctime clkTotal = Abc_Clock();
Exa3_Man_t * p; int fCompl = 0;
word pTruth[16]; Abc_TtReadHex( pTruth, pTtStr );
assert( nVars <= 10 );
assert( nLutSize <= 6 );
p = Exa3_ManAlloc( nVars, nNodes, nLutSize, pTruth );
if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); }
status = Exa3_ManAddCnfStart( p );
assert( status );
printf( "Running exact synthesis for %d-input function with %d %d-input LUTs...\n", p->nVars, p->nNodes, p->nLutSize );
for ( i = 0; iMint != -1; i++ )
{
abctime clk = Abc_Clock();
if ( !Exa3_ManAddCnf( p, iMint ) )
break;
status = bmcg_sat_solver_solve( p->pSat, NULL, 0 );
if ( fVerbose )
{
printf( "Iter %3d : ", i );
Extra_PrintBinary( stdout, (unsigned *)&iMint, p->nVars );
printf( " Var =%5d ", p->iVar );
printf( "Cla =%6d ", bmcg_sat_solver_clausenum(p->pSat) );
printf( "Conf =%9d ", bmcg_sat_solver_conflictnum(p->pSat) );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
if ( status == GLUCOSE_UNSAT )
{
printf( "The problem has no solution.\n" );
break;
}
iMint = Exa3_ManEval( p );
}
if ( iMint == -1 )
Exa3_ManPrintSolution( p, fCompl );
Exa3_ManFree( p );
Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
......
src/sat/bmc/bmcMaj2.c
......@@ -198,7 +198,7 @@ static int Maj_ManMarkup( Maj_Man_t * p )
}
}
}
//printf( "The number of parameter variables = %d.\n", p->iVar );
printf( "The number of parameter variables = %d.\n", p->iVar );
if ( !p->fVerbose )
return p->iVar;
// printout
......@@ -540,7 +540,6 @@ static int Exa_ManMarkup( Exa_Man_t * p )
assert( p->nObjs <= MAJ_NOBJS );
// assign variables for truth tables
p->iVar = 1 + p->nNodes * 3;
// assign variables for other nodes
for ( i = p->nVars; i < p->nObjs; i++ )
{
for ( k = 0; k < 2; k++ )
......@@ -552,7 +551,7 @@ static int Exa_ManMarkup( Exa_Man_t * p )
}
}
}
//printf( "The number of parameter variables = %d.\n", p->iVar );
printf( "The number of parameter variables = %d.\n", p->iVar );
return p->iVar;
// printout
for ( i = p->nVars; i < p->nObjs; i++ )
......@@ -843,6 +842,386 @@ void Exa_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int fVerbose
Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
}
typedef struct Exa3_Man_t_ Exa3_Man_t;
struct Exa3_Man_t_
{
int nVars; // inputs
int nNodes; // internal nodes
int nLutSize; // lut size
int LutMask; // lut mask
int nObjs; // total objects (nVars inputs + nNodes internal nodes)
int nWords; // the truth table size in 64-bit words
int iVar; // the next available SAT variable
word * pTruth; // truth table
Vec_Wrd_t * vInfo; // nVars + nNodes + 1
int VarMarks[MAJ_NOBJS][6][MAJ_NOBJS]; // variable marks
int VarVals[MAJ_NOBJS]; // values of the first nVars variables
Vec_Wec_t * vOutLits; // output vars
sat_solver * pSat; // SAT solver
};
static inline word * Exa3_ManTruth( Exa3_Man_t * p, int v ) { return Vec_WrdEntryP( p->vInfo, p->nWords * v ); }
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static Vec_Wrd_t * Exa3_ManTruthTables( Exa3_Man_t * p )
{
Vec_Wrd_t * vInfo = p->vInfo = Vec_WrdStart( p->nWords * (p->nObjs+1) ); int i;
for ( i = 0; i < p->nVars; i++ )
Abc_TtIthVar( Exa3_ManTruth(p, i), i, p->nVars );
//Dau_DsdPrintFromTruth( Exa3_ManTruth(p, p->nObjs), p->nVars );
return vInfo;
}
static int Exa3_ManMarkup( Exa3_Man_t * p )
{
int i, k, j;
assert( p->nObjs <= MAJ_NOBJS );
// assign variables for truth tables
p->iVar = 1 + p->LutMask * p->nNodes;
for ( i = p->nVars; i < p->nObjs; i++ )
{
for ( k = 0; k < p->nLutSize; k++ )
{
for ( j = 0; j < i - k; j++ )
{
Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) );
p->VarMarks[i][k][j] = p->iVar++;
}
}
}
printf( "The number of parameter variables = %d.\n", p->iVar );
return p->iVar;
// printout
for ( i = p->nVars; i < p->nObjs; i++ )
{
printf( "Node %d\n", i );
for ( j = 0; j < p->nObjs; j++ )
{
for ( k = 0; k < p->nLutSize; k++ )
printf( "%3d ", p->VarMarks[i][k][j] );
printf( "\n" );
}
}
return p->iVar;
}
static Exa3_Man_t * Exa3_ManAlloc( int nVars, int nNodes, int nLutSize, word * pTruth )
{
Exa3_Man_t * p = ABC_CALLOC( Exa3_Man_t, 1 );
p->nVars = nVars;
p->nNodes = nNodes;
p->nLutSize = nLutSize;
p->LutMask = (1 << nLutSize) - 1;
p->nObjs = nVars + nNodes;
p->nWords = Abc_TtWordNum(nVars);
p->pTruth = pTruth;
p->vOutLits = Vec_WecStart( p->nObjs );
p->iVar = Exa3_ManMarkup( p );
p->vInfo = Exa3_ManTruthTables( p );
p->pSat = sat_solver_new();
sat_solver_setnvars( p->pSat, p->iVar );
return p;
}
static void Exa3_ManFree( Exa3_Man_t * p )
{
sat_solver_delete( p->pSat );
Vec_WrdFree( p->vInfo );
Vec_WecFree( p->vOutLits );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Exa3_ManFindFanin( Exa3_Man_t * p, int i, int k )
{
int j, Count = 0, iVar = -1;
for ( j = 0; j < p->nObjs; j++ )
if ( p->VarMarks[i][k][j] && sat_solver_var_value(p->pSat, p->VarMarks[i][k][j]) )
{
iVar = j;
Count++;
}
assert( Count == 1 );
return iVar;
}
static inline int Exa3_ManEval( Exa3_Man_t * p )
{
static int Flag = 0;
int i, k, j, iMint; word * pFanins[6];
for ( i = p->nVars; i < p->nObjs; i++ )
{
int iVarStart = 1 + p->LutMask*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
pFanins[k] = Exa3_ManTruth( p, Exa3_ManFindFanin(p, i, k) );
Abc_TtConst0( Exa3_ManTruth(p, i), p->nWords );
for ( k = 1; k <= p->LutMask; k++ )
{
if ( !sat_solver_var_value(p->pSat, iVarStart+k-1) )
continue;
// Abc_TtAndCompl( Exa3_ManTruth(p, p->nObjs), pFanins[0], !(k&1), pFanins[1], !(k>>1), p->nWords );
Abc_TtConst1( Exa3_ManTruth(p, p->nObjs), p->nWords );
for ( j = 0; j < p->nLutSize; j++ )
Abc_TtAndCompl( Exa3_ManTruth(p, p->nObjs), Exa3_ManTruth(p, p->nObjs), 0, pFanins[j], !((k >> j) & 1), p->nWords );
Abc_TtOr( Exa3_ManTruth(p, i), Exa3_ManTruth(p, i), Exa3_ManTruth(p, p->nObjs), p->nWords );
}
}
if ( Flag && p->nVars >= 6 )
iMint = Abc_TtFindLastDiffBit( Exa3_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars );
else
iMint = Abc_TtFindFirstDiffBit( Exa3_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars );
//Flag ^= 1;
assert( iMint < (1 << p->nVars) );
return iMint;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static void Exa3_ManPrintSolution( Exa3_Man_t * p, int fCompl )
{
int i, k, iVar;
printf( "Realization of given %d-input function using %d %d-input LUTs:\n", p->nVars, p->nNodes, p->nLutSize );
for ( i = p->nObjs - 1; i >= p->nVars; i-- )
{
int Val, iVarStart = 1 + p->LutMask*(i - p->nVars);
// int Val1 = sat_solver_var_value(p->pSat, iVarStart);
// int Val2 = sat_solver_var_value(p->pSat, iVarStart+1);
// int Val3 = sat_solver_var_value(p->pSat, iVarStart+2);
// if ( i == p->nObjs - 1 && fCompl )
// printf( "%02d = 4\'b%d%d%d1(", i, !Val3, !Val2, !Val1 );
// else
// printf( "%02d = 4\'b%d%d%d0(", i, Val3, Val2, Val1 );
printf( "%02d = %d\'b", i, 1 << p->nLutSize );
for ( k = p->LutMask - 1; k >= 0; k-- )
{
Val = sat_solver_var_value(p->pSat, iVarStart+k);
if ( i == p->nObjs - 1 && fCompl )
printf( "%d", !Val );
else
printf( "%d", Val );
}
if ( i == p->nObjs - 1 && fCompl )
printf( "1(" );
else
printf( "0(" );
for ( k = p->nLutSize - 1; k >= 0; k-- )
{
iVar = Exa3_ManFindFanin( p, i, k );
if ( iVar >= 0 && iVar < p->nVars )
printf( " %c", 'a'+iVar );
else
printf( " %02d", iVar );
}
printf( " )\n" );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static int Exa3_ManAddCnfStart( Exa3_Man_t * p )
{
int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m;
// input constraints
for ( i = p->nVars; i < p->nObjs; i++ )
{
int iVarStart = 1 + p->LutMask*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
{
int nLits = 0;
for ( j = 0; j < p->nObjs; j++ )
if ( p->VarMarks[i][k][j] )
pLits[nLits++] = Abc_Var2Lit( p->VarMarks[i][k][j], 0 );
assert( nLits > 0 );
// input uniqueness
if ( !sat_solver_addclause( p->pSat, pLits, pLits+nLits ) )
return 0;
for ( n = 0; n < nLits; n++ )
for ( m = n+1; m < nLits; m++ )
{
pLits2[0] = Abc_LitNot(pLits[n]);
pLits2[1] = Abc_LitNot(pLits[m]);
if ( !sat_solver_addclause( p->pSat, pLits2, pLits2+2 ) )
return 0;
}
if ( k == p->nLutSize - 1 )
break;
// symmetry breaking
for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] )
for ( n = j; n < p->nObjs; n++ ) if ( p->VarMarks[i][k+1][n] )
{
pLits2[0] = Abc_Var2Lit( p->VarMarks[i][k][j], 1 );
pLits2[1] = Abc_Var2Lit( p->VarMarks[i][k+1][n], 1 );
if ( !sat_solver_addclause( p->pSat, pLits2, pLits2+2 ) )
return 0;
}
}
if ( p->nLutSize != 2 )
continue;
// two-input functions
for ( k = 0; k < 3; k++ )
{
pLits[0] = Abc_Var2Lit( iVarStart, k==1 );
pLits[1] = Abc_Var2Lit( iVarStart+1, k==2 );
pLits[2] = Abc_Var2Lit( iVarStart+2, k!=0 );
if ( !sat_solver_addclause( p->pSat, pLits, pLits+3 ) )
return 0;
}
}
// outputs should be used
for ( i = 0; i < p->nObjs - 1; i++ )
{
Vec_Int_t * vArray = Vec_WecEntry(p->vOutLits, i);
assert( Vec_IntSize(vArray) > 0 );
if ( !sat_solver_addclause( p->pSat, Vec_IntArray(vArray), Vec_IntLimit(vArray) ) )
return 0;
}
return 1;
}
static int Exa3_ManAddCnf( Exa3_Man_t * p, int iMint )
{
// save minterm values
int i, k, n, j, Value = Abc_TtGetBit(p->pTruth, iMint);
for ( i = 0; i < p->nVars; i++ )
p->VarVals[i] = (iMint >> i) & 1;
sat_solver_setnvars( p->pSat, p->iVar + (p->nLutSize+1)*p->nNodes );
//printf( "Adding clauses for minterm %d with value %d.\n", iMint, Value );
for ( i = p->nVars; i < p->nObjs; i++ )
{
// fanin connectivity
int iVarStart = 1 + p->LutMask*(i - p->nVars);
int iBaseSatVarI = p->iVar + (p->nLutSize+1)*(i - p->nVars);
for ( k = 0; k < p->nLutSize; k++ )
{
for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] )
{
int iBaseSatVarJ = p->iVar + (p->nLutSize+1)*(j - p->nVars);
for ( n = 0; n < 2; n++ )
{
int pLits[3], nLits = 0;
pLits[nLits++] = Abc_Var2Lit( p->VarMarks[i][k][j], 1 );
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + k, n );
if ( j >= p->nVars )
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarJ + p->nLutSize, !n );
else if ( p->VarVals[j] == n )
continue;
if ( !sat_solver_addclause( p->pSat, pLits, pLits+nLits ) )
return 0;
}
}
}
// node functionality
for ( n = 0; n < 2; n++ )
{
if ( i == p->nObjs - 1 && n == Value )
continue;
for ( k = 0; k <= p->LutMask; k++ )
{
int pLits[8], nLits = 0;
if ( k == 0 && n == 1 )
continue;
//pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 0, (k&1) );
//pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 1, (k>>1) );
//if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 2, !n );
for ( j = 0; j < p->nLutSize; j++ )
pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + j, (k >> j) & 1 );
if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + j, !n );
if ( k > 0 ) pLits[nLits++] = Abc_Var2Lit( iVarStart + k-1, n );
assert( nLits <= p->nLutSize+2 );
if ( !sat_solver_addclause( p->pSat, pLits, pLits+nLits ) )
return 0;
}
}
}
p->iVar += (p->nLutSize+1)*p->nNodes;
return 1;
}
void Exa3_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int nLutSize, int fVerbose )
{
int i, status, iMint = 1;
abctime clkTotal = Abc_Clock();
Exa3_Man_t * p; int fCompl = 0;
word pTruth[16]; Abc_TtReadHex( pTruth, pTtStr );
assert( nVars <= 10 );
assert( nLutSize <= 6 );
p = Exa3_ManAlloc( nVars, nNodes, nLutSize, pTruth );
if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); }
status = Exa3_ManAddCnfStart( p );
assert( status );
printf( "Running exact synthesis for %d-input function with %d %d-input LUTs...\n", p->nVars, p->nNodes, p->nLutSize );
for ( i = 0; iMint != -1; i++ )
{
abctime clk = Abc_Clock();
if ( !Exa3_ManAddCnf( p, iMint ) )
break;
status = sat_solver_solve( p->pSat, NULL, NULL, 0, 0, 0, 0 );
if ( fVerbose )
{
printf( "Iter %3d : ", i );
Extra_PrintBinary( stdout, (unsigned *)&iMint, p->nVars );
printf( " Var =%5d ", p->iVar );
printf( "Cla =%6d ", sat_solver_nclauses(p->pSat) );
printf( "Conf =%9d ", sat_solver_nconflicts(p->pSat) );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
if ( status == l_False )
{
printf( "The problem has no solution.\n" );
break;
}
iMint = Exa3_ManEval( p );
}
if ( iMint == -1 )
Exa3_ManPrintSolution( p, fCompl );
Exa3_ManFree( p );
Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
......
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