| /**CFile**************************************************************** |
| |
| FileName [bmcMaj.c] |
| |
| SystemName [ABC: Logic synthesis and verification system.] |
| |
| PackageName [SAT-based bounded model checking.] |
| |
| Synopsis [Exact synthesis with majority gates.] |
| |
| Author [Alan Mishchenko] |
| |
| Affiliation [UC Berkeley] |
| |
| Date [Ver. 1.0. Started - October 1, 2017.] |
| |
| Revision [$Id: bmcMaj.c,v 1.00 2017/10/01 00:00:00 alanmi Exp $] |
| |
| ***********************************************************************/ |
| |
| #include "bmc.h" |
| #include "misc/extra/extra.h" |
| #include "misc/util/utilTruth.h" |
| #include "sat/glucose/AbcGlucose.h" |
| |
| ABC_NAMESPACE_IMPL_START |
| |
| |
| //////////////////////////////////////////////////////////////////////// |
| /// DECLARATIONS /// |
| //////////////////////////////////////////////////////////////////////// |
| |
| #define MAJ_NOBJS 32 // Const0 + Const1 + nVars + nNodes |
| |
| typedef struct Maj_Man_t_ Maj_Man_t; |
| struct Maj_Man_t_ |
| { |
| int nVars; // inputs |
| int nNodes; // internal nodes |
| int nObjs; // total objects (2 consts, nVars inputs, nNodes internal nodes) |
| int nWords; // the truth table size in 64-bit words |
| int iVar; // the next available SAT variable |
| int fUseConst; // use constant fanins |
| int fUseLine; // use cascade topology |
| Vec_Wrd_t * vInfo; // Const0 + Const1 + nVars + nNodes + Maj(nVars) |
| int VarMarks[MAJ_NOBJS][3][MAJ_NOBJS]; // variable marks |
| int VarVals[MAJ_NOBJS+2]; // values of the first 2 + nVars variables |
| Vec_Wec_t * vOutLits; // output vars |
| bmcg_sat_solver * pSat; // SAT solver |
| }; |
| |
| static inline word * Maj_ManTruth( Maj_Man_t * p, int v ) { return Vec_WrdEntryP( p->vInfo, p->nWords * v ); } |
| |
| //////////////////////////////////////////////////////////////////////// |
| /// FUNCTION DEFINITIONS /// |
| //////////////////////////////////////////////////////////////////////// |
| |
| /**Function************************************************************* |
| |
| Synopsis [] |
| |
| Description [] |
| |
| SideEffects [] |
| |
| SeeAlso [] |
| |
| ***********************************************************************/ |
| int Maj_ManValue( int iMint, int nVars ) |
| { |
| int k, Count = 0; |
| for ( k = 0; k < nVars; k++ ) |
| Count += (iMint >> k) & 1; |
| return (int)(Count > nVars/2); |
| } |
| Vec_Wrd_t * Maj_ManTruthTables( Maj_Man_t * p ) |
| { |
| Vec_Wrd_t * vInfo = p->vInfo = Vec_WrdStart( p->nWords * (p->nObjs + 1) ); |
| int i, nMints = Abc_MaxInt( 64, 1 << p->nVars ); |
| Abc_TtFill( Maj_ManTruth(p, 1), p->nWords ); |
| for ( i = 0; i < p->nVars; i++ ) |
| Abc_TtIthVar( Maj_ManTruth(p, i+2), i, p->nVars ); |
| for ( i = 0; i < nMints; i++ ) |
| if ( Maj_ManValue(i, p->nVars) ) |
| Abc_TtSetBit( Maj_ManTruth(p, p->nObjs), i ); |
| //Dau_DsdPrintFromTruth( Maj_ManTruth(p, p->nObjs), p->nVars ); |
| return vInfo; |
| } |
| int Maj_ManMarkup( Maj_Man_t * p ) |
| { |
| int i, k, j; |
| p->iVar = 1; |
| assert( p->nObjs <= MAJ_NOBJS ); |
| // make exception for the first node |
| i = p->nVars + 2; |
| for ( k = 0; k < 3; k++ ) |
| { |
| j = 4-k; |
| Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) ); |
| p->VarMarks[i][k][j] = p->iVar++; |
| } |
| // assign variables for other nodes |
| for ( i = p->nVars + 3; i < p->nObjs; i++ ) |
| { |
| for ( k = 0; k < 3; k++ ) |
| { |
| if ( p->fUseLine && k == 0 ) |
| { |
| j = i-1; |
| Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) ); |
| p->VarMarks[i][k][j] = p->iVar++; |
| continue; |
| } |
| for ( j = (p->fUseConst && k == 2) ? 0 : 2; 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 + 2; i < p->nObjs; i++ ) |
| { |
| printf( "Node %d\n", i ); |
| for ( j = 0; j < p->nObjs; j++ ) |
| { |
| for ( k = 0; k < 3; k++ ) |
| printf( "%3d ", p->VarMarks[i][k][j] ); |
| printf( "\n" ); |
| } |
| } |
| return p->iVar; |
| } |
| Maj_Man_t * Maj_ManAlloc( int nVars, int nNodes, int fUseConst, int fUseLine ) |
| { |
| Maj_Man_t * p = ABC_CALLOC( Maj_Man_t, 1 ); |
| p->nVars = nVars; |
| p->nNodes = nNodes; |
| p->nObjs = 2 + nVars + nNodes; |
| p->fUseConst = fUseConst; |
| p->fUseLine = fUseLine; |
| p->nWords = Abc_TtWordNum(nVars); |
| p->vOutLits = Vec_WecStart( p->nObjs ); |
| p->iVar = Maj_ManMarkup( p ); |
| p->VarVals[1] = 1; |
| p->vInfo = Maj_ManTruthTables( p ); |
| p->pSat = bmcg_sat_solver_start(); |
| bmcg_sat_solver_set_nvars( p->pSat, p->iVar ); |
| return p; |
| } |
| void Maj_ManFree( Maj_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 Maj_ManFindFanin( Maj_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 Maj_ManEval( Maj_Man_t * p ) |
| { |
| int fUseMiddle = 1; |
| static int Flag = 0; |
| int i, k, iMint; word * pFanins[3]; |
| for ( i = p->nVars + 2; i < p->nObjs; i++ ) |
| { |
| for ( k = 0; k < 3; k++ ) |
| pFanins[k] = Maj_ManTruth( p, Maj_ManFindFanin(p, i, k) ); |
| Abc_TtMaj( Maj_ManTruth(p, i), pFanins[0], pFanins[1], pFanins[2], p->nWords ); |
| } |
| if ( fUseMiddle ) |
| { |
| iMint = -1; |
| for ( i = 0; i < (1 << p->nVars); i++ ) |
| { |
| int nOnes = Abc_TtBitCount16(i); |
| if ( nOnes < p->nVars/2 || nOnes > p->nVars/2+1 ) |
| continue; |
| if ( Abc_TtGetBit(Maj_ManTruth(p, p->nObjs), i) == Abc_TtGetBit(Maj_ManTruth(p, p->nObjs-1), i) ) |
| continue; |
| iMint = i; |
| break; |
| } |
| } |
| else |
| { |
| if ( Flag && p->nVars >= 6 ) |
| iMint = Abc_TtFindLastDiffBit( Maj_ManTruth(p, p->nObjs-1), Maj_ManTruth(p, p->nObjs), p->nVars ); |
| else |
| iMint = Abc_TtFindFirstDiffBit( Maj_ManTruth(p, p->nObjs-1), Maj_ManTruth(p, p->nObjs), p->nVars ); |
| } |
| //Flag ^= 1; |
| assert( iMint < (1 << p->nVars) ); |
| return iMint; |
| } |
| |
| /**Function************************************************************* |
| |
| Synopsis [] |
| |
| Description [] |
| |
| SideEffects [] |
| |
| SeeAlso [] |
| |
| ***********************************************************************/ |
| void Maj_ManPrintSolution( Maj_Man_t * p ) |
| { |
| int i, k, iVar; |
| printf( "Realization of %d-input majority using %d MAJ3 gates:\n", p->nVars, p->nNodes ); |
| // for ( i = p->nVars + 2; i < p->nObjs; i++ ) |
| for ( i = p->nObjs - 1; i >= p->nVars + 2; i-- ) |
| { |
| printf( "%02d = MAJ(", i-2 ); |
| for ( k = 2; k >= 0; k-- ) |
| { |
| iVar = Maj_ManFindFanin( p, i, k ); |
| if ( iVar >= 2 && iVar < p->nVars + 2 ) |
| printf( " %c", 'a'+iVar-2 ); |
| else if ( iVar < 2 ) |
| printf( " %d", iVar ); |
| else |
| printf( " %02d", iVar-2 ); |
| } |
| printf( " )\n" ); |
| } |
| } |
| |
| |
| /**Function************************************************************* |
| |
| Synopsis [] |
| |
| Description [] |
| |
| SideEffects [] |
| |
| SeeAlso [] |
| |
| ***********************************************************************/ |
| int Maj_ManAddCnfStart( Maj_Man_t * p ) |
| { |
| int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m; |
| // input constraints |
| for ( i = p->nVars + 2; i < p->nObjs; i++ ) |
| { |
| for ( k = 0; k < 3; 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 == 2 ) |
| 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; |
| } |
| } |
| } |
| // outputs should be used |
| for ( i = 2; 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; |
| } |
| int Maj_ManAddCnf( Maj_Man_t * p, int iMint ) |
| { |
| // save minterm values |
| int i, k, n, j, Value = Maj_ManValue(iMint, p->nVars); |
| for ( i = 0; i < p->nVars; i++ ) |
| p->VarVals[i+2] = (iMint >> i) & 1; |
| bmcg_sat_solver_set_nvars( p->pSat, p->iVar + 4*p->nNodes ); |
| //printf( "Adding clauses for minterm %d.\n", iMint ); |
| for ( i = p->nVars + 2; i < p->nObjs; i++ ) |
| { |
| // fanin connectivity |
| int iBaseSatVarI = p->iVar + 4*(i - p->nVars - 2); |
| for ( k = 0; k < 3; k++ ) |
| { |
| for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] ) |
| { |
| int iBaseSatVarJ = p->iVar + 4*(j - p->nVars - 2); |
| 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 + 2 ) |
| pLits[nLits++] = Abc_Var2Lit( iBaseSatVarJ + 3, !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 < 3; k++ ) |
| { |
| int pLits[3], nLits = 0; |
| if ( k != 0 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 0, n ); |
| if ( k != 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 1, n ); |
| if ( k != 2 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 2, n ); |
| if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVarI + 3, !n ); |
| assert( nLits <= 3 ); |
| if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) ) |
| return 0; |
| } |
| } |
| } |
| p->iVar += 4*p->nNodes; |
| return 1; |
| } |
| int Maj_ManExactSynthesis( int nVars, int nNodes, int fUseConst, int fUseLine, int fVerbose ) |
| { |
| int i, iMint = 0; |
| abctime clkTotal = Abc_Clock(); |
| Maj_Man_t * p = Maj_ManAlloc( nVars, nNodes, fUseConst, fUseLine ); |
| int status = Maj_ManAddCnfStart( p ); |
| assert( status ); |
| printf( "Running exact synthesis for %d-input majority with %d MAJ3 gates...\n", p->nVars, p->nNodes ); |
| for ( i = 0; iMint != -1; i++ ) |
| { |
| abctime clk = Abc_Clock(); |
| if ( !Maj_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 = Maj_ManEval( p ); |
| } |
| if ( iMint == -1 ) |
| Maj_ManPrintSolution( p ); |
| Maj_ManFree( p ); |
| Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal ); |
| return iMint == -1; |
| } |
| |
| |
| |
| |
| |
| |
| |
| |
| typedef struct Exa_Man_t_ Exa_Man_t; |
| struct Exa_Man_t_ |
| { |
| Bmc_EsPar_t * pPars; // parameters |
| int nVars; // inputs |
| int nNodes; // internal nodes |
| 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][2][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 * Exa_ManTruth( Exa_Man_t * p, int v ) { return Vec_WrdEntryP( p->vInfo, p->nWords * v ); } |
| |
| |
| /**Function************************************************************* |
| |
| Synopsis [] |
| |
| Description [] |
| |
| SideEffects [] |
| |
| SeeAlso [] |
| |
| ***********************************************************************/ |
| Vec_Wrd_t * Exa_ManTruthTables( Exa_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( Exa_ManTruth(p, i), i, p->nVars ); |
| //Dau_DsdPrintFromTruth( Exa_ManTruth(p, p->nObjs), p->nVars ); |
| return vInfo; |
| } |
| int Exa_ManMarkup( Exa_Man_t * p ) |
| { |
| int i, k, j; |
| assert( p->nObjs <= MAJ_NOBJS ); |
| // assign functionality |
| p->iVar = 1 + p->nNodes * 3; |
| // assign connectivity variables |
| for ( i = p->nVars; i < p->nObjs; i++ ) |
| { |
| for ( k = 0; k < 2; k++ ) |
| { |
| if ( p->pPars->fFewerVars && i == p->nObjs - 1 && k == 0 ) |
| { |
| j = p->nObjs - 2; |
| Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) ); |
| p->VarMarks[i][k][j] = p->iVar++; |
| continue; |
| } |
| for ( j = p->pPars->fFewerVars ? 1 - k : 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 < 2; k++ ) |
| printf( "%3d ", p->VarMarks[i][k][j] ); |
| printf( "\n" ); |
| } |
| } |
| return p->iVar; |
| } |
| Exa_Man_t * Exa_ManAlloc( Bmc_EsPar_t * pPars, word * pTruth ) |
| { |
| Exa_Man_t * p = ABC_CALLOC( Exa_Man_t, 1 ); |
| p->pPars = pPars; |
| p->nVars = pPars->nVars; |
| p->nNodes = pPars->nNodes; |
| p->nObjs = pPars->nVars + pPars->nNodes; |
| p->nWords = Abc_TtWordNum(pPars->nVars); |
| p->pTruth = pTruth; |
| p->vOutLits = Vec_WecStart( p->nObjs ); |
| p->iVar = Exa_ManMarkup( p ); |
| p->vInfo = Exa_ManTruthTables( p ); |
| p->pSat = bmcg_sat_solver_start(); |
| bmcg_sat_solver_set_nvars( p->pSat, p->iVar ); |
| return p; |
| } |
| void Exa_ManFree( Exa_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 Exa_ManFindFanin( Exa_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 Exa_ManEval( Exa_Man_t * p ) |
| { |
| static int Flag = 0; |
| int i, k, iMint; word * pFanins[2]; |
| for ( i = p->nVars; i < p->nObjs; i++ ) |
| { |
| int iVarStart = 1 + 3*(i - p->nVars); |
| for ( k = 0; k < 2; k++ ) |
| pFanins[k] = Exa_ManTruth( p, Exa_ManFindFanin(p, i, k) ); |
| Abc_TtConst0( Exa_ManTruth(p, i), p->nWords ); |
| for ( k = 1; k < 4; k++ ) |
| { |
| if ( !bmcg_sat_solver_read_cex_varvalue(p->pSat, iVarStart+k-1) ) |
| continue; |
| Abc_TtAndCompl( Exa_ManTruth(p, p->nObjs), pFanins[0], !(k&1), pFanins[1], !(k>>1), p->nWords ); |
| Abc_TtOr( Exa_ManTruth(p, i), Exa_ManTruth(p, i), Exa_ManTruth(p, p->nObjs), p->nWords ); |
| } |
| } |
| if ( Flag && p->nVars >= 6 ) |
| iMint = Abc_TtFindLastDiffBit( Exa_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars ); |
| else |
| iMint = Abc_TtFindFirstDiffBit( Exa_ManTruth(p, p->nObjs-1), p->pTruth, p->nVars ); |
| //Flag ^= 1; |
| assert( iMint < (1 << p->nVars) ); |
| return iMint; |
| } |
| |
| /**Function************************************************************* |
| |
| Synopsis [] |
| |
| Description [] |
| |
| SideEffects [] |
| |
| SeeAlso [] |
| |
| ***********************************************************************/ |
| void Exa_ManPrintSolution( Exa_Man_t * p, int fCompl ) |
| { |
| int i, k, iVar; |
| printf( "Realization of given %d-input function using %d two-input gates:\n", p->nVars, p->nNodes ); |
| // for ( i = p->nVars + 2; i < p->nObjs; i++ ) |
| for ( i = p->nObjs - 1; i >= p->nVars; i-- ) |
| { |
| int iVarStart = 1 + 3*(i - p->nVars); |
| int Val1 = bmcg_sat_solver_read_cex_varvalue(p->pSat, iVarStart); |
| int Val2 = bmcg_sat_solver_read_cex_varvalue(p->pSat, iVarStart+1); |
| int Val3 = bmcg_sat_solver_read_cex_varvalue(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 ); |
| for ( k = 1; k >= 0; k-- ) |
| { |
| iVar = Exa_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 [] |
| |
| ***********************************************************************/ |
| int Exa_ManAddCnfStart( Exa_Man_t * p, int fOnlyAnd ) |
| { |
| int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m; |
| // input constraints |
| for ( i = p->nVars; i < p->nObjs; i++ ) |
| { |
| int iVarStart = 1 + 3*(i - p->nVars); |
| for ( k = 0; k < 2; 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 == 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; |
| } |
| } |
| #ifdef USE_NODE_ORDER |
| // node ordering |
| for ( j = p->nVars; j < i; j++ ) |
| for ( n = 0; n < p->nObjs; n++ ) if ( p->VarMarks[i][0][n] ) |
| for ( m = n+1; m < p->nObjs; m++ ) if ( p->VarMarks[j][0][m] ) |
| { |
| pLits2[0] = Abc_Var2Lit( p->VarMarks[i][0][n], 1 ); |
| pLits2[1] = Abc_Var2Lit( p->VarMarks[j][0][m], 1 ); |
| if ( !bmcg_sat_solver_addclause( p->pSat, pLits2, 2 ) ) |
| return 0; |
| } |
| #endif |
| // 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; |
| } |
| if ( fOnlyAnd ) |
| { |
| pLits[0] = Abc_Var2Lit( iVarStart, 1 ); |
| pLits[1] = Abc_Var2Lit( iVarStart+1, 1 ); |
| pLits[2] = Abc_Var2Lit( iVarStart+2, 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; |
| } |
| int Exa_ManAddCnf( Exa_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; |
| bmcg_sat_solver_set_nvars( p->pSat, p->iVar + 3*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 + 3*(i - p->nVars); |
| int iBaseSatVarI = p->iVar + 3*(i - p->nVars); |
| for ( k = 0; k < 2; k++ ) |
| { |
| for ( j = 0; j < p->nObjs; j++ ) if ( p->VarMarks[i][k][j] ) |
| { |
| int iBaseSatVarJ = p->iVar + 3*(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 + 2, !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 < 4; k++ ) |
| { |
| int pLits[4], 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 ); |
| if ( k > 0 ) pLits[nLits++] = Abc_Var2Lit( iVarStart + k-1, n ); |
| assert( nLits <= 4 ); |
| if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) ) |
| return 0; |
| } |
| } |
| } |
| p->iVar += 3*p->nNodes; |
| return 1; |
| } |
| void Exa_ManExactSynthesis( Bmc_EsPar_t * pPars ) |
| { |
| int i, status, iMint = 1; |
| abctime clkTotal = Abc_Clock(); |
| Exa_Man_t * p; int fCompl = 0; |
| word pTruth[16]; Abc_TtReadHex( pTruth, pPars->pTtStr ); |
| assert( pPars->nVars <= 10 ); |
| p = Exa_ManAlloc( pPars, pTruth ); |
| if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); } |
| status = Exa_ManAddCnfStart( p, pPars->fOnlyAnd ); |
| assert( status ); |
| printf( "Running exact synthesis for %d-input function with %d two-input gates...\n", p->nVars, p->nNodes ); |
| for ( i = 0; iMint != -1; i++ ) |
| { |
| abctime clk = Abc_Clock(); |
| if ( !Exa_ManAddCnf( p, iMint ) ) |
| break; |
| status = bmcg_sat_solver_solve( p->pSat, NULL, 0 ); |
| if ( pPars->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 = Exa_ManEval( p ); |
| } |
| if ( iMint == -1 ) |
| Exa_ManPrintSolution( p, fCompl ); |
| Exa_ManFree( p ); |
| Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal ); |
| } |
| |
| |
| |
| |
| typedef struct Exa3_Man_t_ Exa3_Man_t; |
| struct Exa3_Man_t_ |
| { |
| Bmc_EsPar_t * pPars; // parameters |
| 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 |
| Vec_Bit_t * vUsed2; // bit masks |
| Vec_Bit_t * vUsed3; // bit masks |
| 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 |
| int nUsed[2]; |
| }; |
| |
| static inline word * Exa3_ManTruth( Exa3_Man_t * p, int v ) { return Vec_WrdEntryP( p->vInfo, p->nWords * v ); } |
| |
| static inline int Exa3_ManIsUsed2( Exa3_Man_t * p, int m, int n, int i, int j ) |
| { |
| int Pos = ((m * p->pPars->nNodes + n - p->pPars->nVars) * p->nObjs + i) * p->nObjs + j; |
| p->nUsed[0]++; |
| assert( i < n && j < n && i < j ); |
| if ( Vec_BitEntry(p->vUsed2, Pos) ) |
| return 1; |
| p->nUsed[1]++; |
| Vec_BitWriteEntry( p->vUsed2, Pos, 1 ); |
| return 0; |
| } |
| |
| static inline int Exa3_ManIsUsed3( Exa3_Man_t * p, int m, int n, int i, int j, int k ) |
| { |
| int Pos = (((m * p->pPars->nNodes + n - p->pPars->nVars) * p->nObjs + i) * p->nObjs + j) * p->nObjs + k; |
| p->nUsed[0]++; |
| assert( i < n && j < n && k < n && i < j && j < k ); |
| if ( Vec_BitEntry(p->vUsed3, Pos) ) |
| return 1; |
| p->nUsed[1]++; |
| Vec_BitWriteEntry( p->vUsed3, Pos, 1 ); |
| return 0; |
| } |
| |
| |
| /**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 functionality variables |
| p->iVar = 1 + p->LutMask * p->nNodes; |
| // assign connectivity variables |
| for ( i = p->nVars; i < p->nObjs; i++ ) |
| { |
| for ( k = 0; k < p->nLutSize; k++ ) |
| { |
| if ( p->pPars->fFewerVars && i == p->nObjs - 1 && k == 0 ) |
| { |
| j = p->nObjs - 2; |
| Vec_WecPush( p->vOutLits, j, Abc_Var2Lit(p->iVar, 0) ); |
| p->VarMarks[i][k][j] = p->iVar++; |
| continue; |
| } |
| for ( j = p->pPars->fFewerVars ? p->nLutSize - 1 - k : 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->nObjs - 1; i >= p->nVars; i-- ) |
| { |
| printf( " Node %2d\n", i ); |
| for ( j = 0; j < p->nObjs; j++ ) |
| { |
| printf( "Fanin %2d : ", 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( Bmc_EsPar_t * pPars, word * pTruth ) |
| { |
| Exa3_Man_t * p = ABC_CALLOC( Exa3_Man_t, 1 ); |
| p->pPars = pPars; |
| p->nVars = pPars->nVars; |
| p->nNodes = pPars->nNodes; |
| p->nLutSize = pPars->nLutSize; |
| p->LutMask = (1 << pPars->nLutSize) - 1; |
| p->nObjs = pPars->nVars + pPars->nNodes; |
| p->nWords = Abc_TtWordNum(pPars->nVars); |
| p->pTruth = pTruth; |
| p->vOutLits = Vec_WecStart( p->nObjs ); |
| p->iVar = Exa3_ManMarkup( p ); |
| p->vInfo = Exa3_ManTruthTables( p ); |
| if ( p->pPars->nLutSize == 2 ) |
| p->vUsed2 = Vec_BitStart( (1 << p->pPars->nVars) * p->pPars->nNodes * p->nObjs * p->nObjs ); |
| else if ( p->pPars->nLutSize == 3 ) |
| p->vUsed3 = Vec_BitStart( (1 << p->pPars->nVars) * p->pPars->nNodes * p->nObjs * p->nObjs * p->nObjs ); |
| 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_BitFreeP( &p->vUsed2 ); |
| Vec_BitFreeP( &p->vUsed3 ); |
| 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 fOnlyAnd ) |
| { |
| 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; |
| } |
| } |
| //#ifdef USE_NODE_ORDER |
| // node ordering |
| if ( p->pPars->fUseIncr ) |
| { |
| for ( j = p->nVars; j < i; j++ ) |
| for ( n = 0; n < p->nObjs; n++ ) if ( p->VarMarks[i][0][n] ) |
| for ( m = n+1; m < p->nObjs; m++ ) if ( p->VarMarks[j][0][m] ) |
| { |
| pLits2[0] = Abc_Var2Lit( p->VarMarks[i][0][n], 1 ); |
| pLits2[1] = Abc_Var2Lit( p->VarMarks[j][0][m], 1 ); |
| if ( !bmcg_sat_solver_addclause( p->pSat, pLits2, 2 ) ) |
| return 0; |
| } |
| } |
| //#endif |
| 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; |
| } |
| if ( fOnlyAnd ) |
| { |
| pLits[0] = Abc_Var2Lit( iVarStart, 1 ); |
| pLits[1] = Abc_Var2Lit( iVarStart+1, 1 ); |
| pLits[2] = Abc_Var2Lit( iVarStart+2, 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[16], 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; |
| } |
| |
| static int Exa3_ManAddCnf2( Exa3_Man_t * p, int iMint ) |
| { |
| int iBaseSatVar = p->iVar + p->nNodes*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; |
| //printf( "Adding clauses for minterm %d with value %d.\n", iMint, Value ); |
| for ( i = p->nVars; i < p->nObjs; i++ ) |
| { |
| // int iBaseSatVarI = p->iVar + (p->nLutSize+1)*(i - p->nVars); |
| int iVarStart = 1 + p->LutMask*(i - p->nVars); |
| // collect fanin variables |
| int pFanins[16]; |
| for ( j = 0; j < p->nLutSize; j++ ) |
| pFanins[j] = Exa3_ManFindFanin(p, i, j); |
| // check cache |
| if ( p->pPars->nLutSize == 2 && Exa3_ManIsUsed2(p, iMint, i, pFanins[1], pFanins[0]) ) |
| continue; |
| if ( p->pPars->nLutSize == 3 && Exa3_ManIsUsed3(p, iMint, i, pFanins[2], pFanins[1], pFanins[0]) ) |
| continue; |
| // 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[16], nLits = 0; |
| if ( k == 0 && n == 1 ) |
| continue; |
| for ( j = 0; j < p->nLutSize; j++ ) |
| { |
| // pLits[nLits++] = Abc_Var2Lit( iBaseSatVar + j, (k >> j) & 1 ); |
| pLits[nLits++] = Abc_Var2Lit( p->VarMarks[i][j][pFanins[j]], 1 ); |
| if ( pFanins[j] >= p->nVars ) |
| pLits[nLits++] = Abc_Var2Lit( iBaseSatVar + pFanins[j] - p->nVars, (k >> j) & 1 ); |
| else if ( p->VarVals[pFanins[j]] != ((k >> j) & 1) ) |
| break; |
| } |
| if ( j < p->nLutSize ) |
| continue; |
| // if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVar + j, !n ); |
| if ( i != p->nObjs - 1 ) pLits[nLits++] = Abc_Var2Lit( iBaseSatVar + i - p->nVars, !n ); |
| if ( k > 0 ) pLits[nLits++] = Abc_Var2Lit( iVarStart + k-1, n ); |
| assert( nLits <= 2*p->nLutSize+2 ); |
| if ( !bmcg_sat_solver_addclause( p->pSat, pLits, nLits ) ) |
| return 0; |
| } |
| } |
| } |
| return 1; |
| } |
| void Exa3_ManPrint( Exa3_Man_t * p, int i, int iMint, abctime clk ) |
| { |
| printf( "Iter%6d : ", i ); |
| Extra_PrintBinary( stdout, (unsigned *)&iMint, p->nVars ); |
| printf( " Var =%5d ", bmcg_sat_solver_varnum(p->pSat) ); |
| printf( "Cla =%6d ", bmcg_sat_solver_clausenum(p->pSat) ); |
| printf( "Conf =%9d ", bmcg_sat_solver_conflictnum(p->pSat) ); |
| Abc_PrintTime( 1, "Time", clk ); |
| } |
| void Exa3_ManExactSynthesis( Bmc_EsPar_t * pPars ) |
| { |
| int i, status, iMint = 1; |
| abctime clkTotal = Abc_Clock(); |
| Exa3_Man_t * p; int fCompl = 0; |
| word pTruth[16]; Abc_TtReadHex( pTruth, pPars->pTtStr ); |
| assert( pPars->nVars <= 10 ); |
| assert( pPars->nLutSize <= 6 ); |
| p = Exa3_ManAlloc( pPars, pTruth ); |
| if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); } |
| status = Exa3_ManAddCnfStart( p, pPars->fOnlyAnd ); |
| assert( status ); |
| printf( "Running exact synthesis for %d-input function with %d %d-input LUTs...\n", p->nVars, p->nNodes, p->nLutSize ); |
| if ( pPars->fUseIncr ) |
| { |
| bmcg_sat_solver_set_nvars( p->pSat, p->iVar + p->nNodes*(1 << p->nVars) ); |
| status = bmcg_sat_solver_solve( p->pSat, NULL, 0 ); |
| assert( status == GLUCOSE_SAT ); |
| } |
| for ( i = 0; iMint != -1; i++ ) |
| { |
| if ( pPars->fUseIncr ? !Exa3_ManAddCnf2( p, iMint ) : !Exa3_ManAddCnf( p, iMint ) ) |
| break; |
| status = bmcg_sat_solver_solve( p->pSat, NULL, 0 ); |
| if ( pPars->fVerbose && (!pPars->fUseIncr || i % 100 == 0) ) |
| Exa3_ManPrint( p, i, iMint, Abc_Clock() - clkTotal ); |
| if ( status == GLUCOSE_UNSAT ) |
| break; |
| iMint = Exa3_ManEval( p ); |
| } |
| if ( pPars->fVerbose ) |
| Exa3_ManPrint( p, i, iMint, Abc_Clock() - clkTotal ); |
| if ( iMint == -1 ) |
| Exa3_ManPrintSolution( p, fCompl ); |
| else |
| printf( "The problem has no solution.\n" ); |
| printf( "Added = %d. Tried = %d. ", p->nUsed[1], p->nUsed[0] ); |
| Exa3_ManFree( p ); |
| Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal ); |
| } |
| |
| //////////////////////////////////////////////////////////////////////// |
| /// END OF FILE /// |
| //////////////////////////////////////////////////////////////////////// |
| |
| |
| ABC_NAMESPACE_IMPL_END |
| |
