Specialized induction check.

9 files changed, 289 insertions, 5 deletions

diff --git a/abclib.dsp b/abclib.dsp
index ca334c98..80da99f7 100644
--- a/abclib.dsp
+++ b/abclib.dsp
@@ -1443,6 +1443,10 @@ SOURCE=.\src\sat\bmc\bmcCexTools.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\src\sat\bmc\bmcICheck.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\src\sat\bmc\bmcLoad.c
 # End Source File
 # Begin Source File
diff --git a/src/aig/gia/gia.h b/src/aig/gia/gia.h
index 7d5d6dde..416ec8a0 100644
--- a/src/aig/gia/gia.h
+++ b/src/aig/gia/gia.h
@@ -253,6 +253,7 @@ struct Jf_Par_t_
     int            fCutMin;
     int            fFuncDsd;
     int            fGenCnf;
+    int            fCnfObjIds;
     int            fPureAig;
     int            fVerbose;
     int            fVeryVerbose;
@@ -1097,7 +1098,7 @@ extern Gia_Man_t *         Gia_ManPerformMapping( Gia_Man_t * p, void * pIfPars,
 /*=== giaJf.c ===========================================================*/
 extern void                Jf_ManSetDefaultPars( Jf_Par_t * pPars );
 extern Gia_Man_t *         Jf_ManPerformMapping( Gia_Man_t * pGia, Jf_Par_t * pPars );
-extern Gia_Man_t *         Jf_ManDeriveCnf( Gia_Man_t * p );
+extern Gia_Man_t *         Jf_ManDeriveCnf( Gia_Man_t * p, int fCnfObjIds );
 /*=== giaIso.c ===========================================================*/
 extern Gia_Man_t *         Gia_ManIsoCanonicize( Gia_Man_t * p, int fVerbose );
 extern Gia_Man_t *         Gia_ManIsoReduce( Gia_Man_t * p, Vec_Ptr_t ** pvPosEquivs, Vec_Ptr_t ** pvPiPerms, int fEstimate, int fDualOut, int fVerbose, int fVeryVerbose );
diff --git a/src/aig/gia/giaJf.c b/src/aig/gia/giaJf.c
index 5f30b524..8ba81c4c 100644
--- a/src/aig/gia/giaJf.c
+++ b/src/aig/gia/giaJf.c
@@ -1540,7 +1540,10 @@ Gia_Man_t * Jf_ManDeriveMappingGia( Jf_Man_t * p )
     // derive CNF
     if ( p->pPars->fGenCnf )
     {
-        pNew->pData = Jf_ManCreateCnf( pNew, vLits, vClas );
+        if ( p->pPars->fCnfObjIds )
+            pNew->pData = Jf_ManCreateCnf( pNew, vLits, vClas );
+        else
+            pNew->pData = Jf_ManCreateCnfRemap( pNew, vLits, vClas );
     }
     Vec_IntFreeP( &vLits );
     Vec_IntFreeP( &vClas );
@@ -1749,11 +1752,12 @@ Gia_Man_t * Jf_ManPerformMapping( Gia_Man_t * pGia, Jf_Par_t * pPars )
     Jf_ManFree( p );
     return pNew;
 }
-Gia_Man_t * Jf_ManDeriveCnf( Gia_Man_t * p )
+Gia_Man_t * Jf_ManDeriveCnf( Gia_Man_t * p, int fCnfObjIds )
 {
     Jf_Par_t Pars, * pPars = &Pars;
     Jf_ManSetDefaultPars( pPars );
     pPars->fGenCnf = 1;
+    pPars->fCnfObjIds = fCnfObjIds;
     return Jf_ManPerformMapping( p, pPars );
 }
 void Jf_ManTestCnf( Gia_Man_t * p )
@@ -1762,7 +1766,7 @@ void Jf_ManTestCnf( Gia_Man_t * p )
     Cnf_Dat_t * pCnf;
     int i;
 //    Cnf_Dat_t * pCnf = Cnf_DeriveGia( p );
-    pNew = Jf_ManDeriveCnf( p );
+    pNew = Jf_ManDeriveCnf( p, 1 );
     pCnf = (Cnf_Dat_t *)pNew->pData; pNew->pData = NULL;
     Cnf_DataWriteIntoFile( pCnf, "test.cnf", 0, NULL, NULL );
     for ( i = 0; i < pCnf->nVars; i++ )
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 2431a9e3..98516f42 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -401,6 +401,7 @@ static int Abc_CommandAbc9PoPart             ( Abc_Frame_t * pAbc, int argc, cha
 static int Abc_CommandAbc9GroupProve         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9MultiProve         ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9Bmc                ( Abc_Frame_t * pAbc, int argc, char ** argv );
+static int Abc_CommandAbc9ICheck             ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9SatTest            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 //static int Abc_CommandAbc9PoPart2            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 //static int Abc_CommandAbc9CexCut             ( Abc_Frame_t * pAbc, int argc, char ** argv );
@@ -965,6 +966,7 @@ void Abc_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "ABC9",         "&gprove",       Abc_CommandAbc9GroupProve,   0 );
     Cmd_CommandAdd( pAbc, "ABC9",         "&mprove",       Abc_CommandAbc9MultiProve,   0 );
     Cmd_CommandAdd( pAbc, "ABC9",         "&bmc",          Abc_CommandAbc9Bmc,          0 );
+    Cmd_CommandAdd( pAbc, "ABC9",         "&icheck",       Abc_CommandAbc9ICheck,       0 );
     Cmd_CommandAdd( pAbc, "ABC9",         "&sattest",      Abc_CommandAbc9SatTest,      0 );
 //    Cmd_CommandAdd( pAbc, "ABC9",         "&popart2",      Abc_CommandAbc9PoPart2,      0 );
 //    Cmd_CommandAdd( pAbc, "ABC9",         "&cexcut",       Abc_CommandAbc9CexCut,       0 );
@@ -32572,6 +32574,79 @@ usage:
   SeeAlso     []
 
 ***********************************************************************/
+int Abc_CommandAbc9ICheck( Abc_Frame_t * pAbc, int argc, char ** argv )
+{
+    int c, nFramesMax = 1, nTimeOut = 0, fVerbose = 0;
+    Extra_UtilGetoptReset();
+    while ( ( c = Extra_UtilGetopt( argc, argv, "MTvh" ) ) != EOF )
+    {
+        switch ( c )
+        {
+        case 'M':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-M\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nFramesMax = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nFramesMax < 0 )
+                goto usage;
+            break;
+        case 'T':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-T\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nTimeOut = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nTimeOut < 0 )
+                goto usage;
+            break;
+        case 'v':
+            fVerbose ^= 1;
+            break;
+        case 'h':
+            goto usage;
+        default:
+            goto usage;
+        }
+    }
+    if ( pAbc->pGia == NULL )
+    {
+        Abc_Print( -1, "Abc_CommandAbc9ICheck(): There is no AIG.\n" );
+        return 0;
+    }
+    if ( Gia_ManRegNum(pAbc->pGia) == 0 )
+    {
+        Abc_Print( -1, "Abc_CommandAbc9ICheck(): The AIG is combinational.\n" );
+        return 0;
+    }
+    Bmc_PerformICheck( pAbc->pGia, nFramesMax, nTimeOut, fVerbose );
+    return 0;
+
+usage:
+    Abc_Print( -2, "usage: &icheck [-MT num] [-cvh]\n" );
+    Abc_Print( -2, "\t         performs specialized inductiveness check\n" );
+    Abc_Print( -2, "\t-M num : the number of timeframes used for inductiion [default = %d]\n", nFramesMax );
+    Abc_Print( -2, "\t-T num : approximate global runtime limit in seconds [default = %d]\n",  nTimeOut );
+    Abc_Print( -2, "\t-v     : toggle printing verbose information [default = %s]\n",          fVerbose? "yes": "no" );
+    Abc_Print( -2, "\t-h     : print the command usage\n");
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
 int Abc_CommandAbc9SatTest( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
     extern void Bmc_LoadTest( Gia_Man_t * pGia, int fLoadCnf, int fVerbose );
diff --git a/src/sat/bmc/bmc.h b/src/sat/bmc/bmc.h
index 27e7d563..ae76ff6b 100644
--- a/src/sat/bmc/bmc.h
+++ b/src/sat/bmc/bmc.h
@@ -128,6 +128,8 @@ extern Gia_Man_t *       Bmc_GiaTargetStates( Gia_Man_t * p, Abc_Cex_t * pCex, i
 extern Aig_Man_t *       Bmc_AigTargetStates( Aig_Man_t * p, Abc_Cex_t * pCex, int iFrBeg, int iFrEnd, int fCombOnly, int fGenAll, int fAllFrames, int fVerbose );
 /*=== bmcCexMin.c ==========================================================*/
 extern Abc_Cex_t *       Saig_ManCexMinPerform( Aig_Man_t * pAig, Abc_Cex_t * pCex );
+/*=== bmcICheck.c ==========================================================*/
+extern void              Bmc_PerformICheck( Gia_Man_t * p, int nFramesMax, int nTimeOut, int fVerbose );
 /*=== bmcUnroll.c ==========================================================*/
 extern Unr_Man_t *       Unr_ManUnrollStart( Gia_Man_t * pGia, int fVerbose );
 extern Gia_Man_t *       Unr_ManUnrollFrame( Unr_Man_t * p, int f );
diff --git a/src/sat/bmc/bmcBmcAnd.c b/src/sat/bmc/bmcBmcAnd.c
index e6200667..c23c3f50 100644
--- a/src/sat/bmc/bmcBmcAnd.c
+++ b/src/sat/bmc/bmcBmcAnd.c
@@ -983,7 +983,7 @@ int Gia_ManBmcPerformInt( Gia_Man_t * pGia, Bmc_AndPar_t * pPars )
         p->pCnf = Cnf_DeriveGia( p->pFrames );
     else
     {
-        p->pFrames = Jf_ManDeriveCnf( pTemp = p->pFrames );  Gia_ManStop( pTemp );
+        p->pFrames = Jf_ManDeriveCnf( pTemp = p->pFrames, 1 );  Gia_ManStop( pTemp );
         p->pCnf = (Cnf_Dat_t *)p->pFrames->pData; p->pFrames->pData = NULL;
     }
     Vec_IntFillExtra( p->vId2Var, Gia_ManObjNum(p->pFrames), 0 );
diff --git a/src/sat/bmc/bmcICheck.c b/src/sat/bmc/bmcICheck.c
new file mode 100644
index 00000000..9b567094
--- /dev/null
+++ b/src/sat/bmc/bmcICheck.c
@@ -0,0 +1,178 @@
+/**CFile****************************************************************
+
+  FileName    [bmcICheck.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based bounded model checking.]
+
+  Synopsis    [Performs specialized check.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bmcICheck.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bmc.h"
+#include "sat/cnf/cnf.h"
+#include "sat/bsat/satStore.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bmc_PerformICheck( Gia_Man_t * p, int nFramesMax, int nTimeOut, int fVerbose )
+{
+    Gia_Man_t * pMiter, * pTemp;
+    Cnf_Dat_t * pCnf;
+    sat_solver * pSat;
+    Vec_Int_t * vLits;
+    Gia_Obj_t * pObj, * pObj0, * pObj1;
+    int i, k, status, iVar0, iVar1, iVarOut;
+    int nLits, * pLits;
+    abctime clkStart = Abc_Clock();
+    assert( nFramesMax > 0 );
+    assert( Gia_ManRegNum(p) > 0 );
+
+    // create miter
+    pTemp = Gia_ManDup( p );
+    pMiter = Gia_ManMiter( p, pTemp, 0, 1, 1, 0 );
+    Gia_ManStop( pTemp );
+    assert( Gia_ManPoNum(pMiter)  == 2 * Gia_ManPoNum(p) );
+    assert( Gia_ManRegNum(pMiter) == 2 * Gia_ManRegNum(p) );
+    // derive CNF
+    pMiter = Jf_ManDeriveCnf( pTemp = pMiter, 0 );
+    Gia_ManStop( pTemp );
+    pCnf = (Cnf_Dat_t *)pMiter->pData; pMiter->pData = NULL;
+
+    // start the SAT solver
+    pSat = sat_solver_new();
+    sat_solver_setnvars( pSat, Gia_ManRegNum(p) + Gia_ManCoNum(p) + pCnf->nVars * (nFramesMax + 1) );
+    sat_solver_set_runtime_limit( pSat, nTimeOut ? nTimeOut * CLOCKS_PER_SEC + Abc_Clock(): 0 );
+
+    // load the last timeframe
+    Cnf_DataLift( pCnf, Gia_ManRegNum(p) + Gia_ManCoNum(p) );
+    // add one large OR clause
+    vLits = Vec_IntAlloc( Gia_ManCoNum(p) );
+    Gia_ManForEachCo( p, pObj, i )
+        Vec_IntPush( vLits, Abc_Var2Lit(Gia_ManRegNum(p) + i, 0) );
+    sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits) );
+    // add XOR clauses
+    Gia_ManForEachPo( p, pObj, i )
+    {
+        pObj0 = Gia_ManPo( pMiter, 2*i+0 );
+        pObj1 = Gia_ManPo( pMiter, 2*i+1 );
+        iVar0 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj0)];
+        iVar1 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj1)];
+        iVarOut = Gia_ManRegNum(p) + i;
+        sat_solver_add_xor( pSat, iVar0, iVar1, iVarOut, 0 );
+    }
+    Gia_ManForEachRi( p, pObj, i )
+    {
+        pObj0 = Gia_ManRi( pMiter, i );
+        pObj1 = Gia_ManRi( pMiter, i + Gia_ManRegNum(p) );
+        iVar0 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj0)];
+        iVar1 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj1)];
+        iVarOut = Gia_ManRegNum(p) + Gia_ManPoNum(p) + i;
+        sat_solver_add_xor( pSat, iVar0, iVar1, iVarOut, 0 );
+    }
+    // add timeframe clauses
+    for ( i = 0; i < pCnf->nClauses; i++ )
+        if ( !sat_solver_addclause( pSat, pCnf->pClauses[i], pCnf->pClauses[i+1] ) )
+            assert( 0 );
+
+    // add other timeframes
+    printf( "Solving M-inductiveness for design %s with %d AND nodes and %d flip-flops:\n",
+        Gia_ManName(p), Gia_ManAndNum(p), Gia_ManRegNum(p) );
+    for ( k = 0; k < nFramesMax; k++ )
+    {
+        // collect variables of the RO nodes
+        Vec_IntClear( vLits );
+        Gia_ManForEachRo( pMiter, pObj, i )
+            Vec_IntPush( vLits, pCnf->pVarNums[Gia_ObjId(pMiter, pObj)] );
+        // lift CNF again
+        Cnf_DataLift( pCnf, pCnf->nVars );
+        // stitch the clauses
+        Gia_ManForEachRi( pMiter, pObj, i )
+        {
+            iVar0 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj)];
+            iVar1 = Vec_IntEntry( vLits, i );
+            sat_solver_add_buffer( pSat, iVar0, iVar1, 0 );
+        }
+        // add equality clauses for the COs
+        Gia_ManForEachPo( p, pObj, i )
+        {
+            pObj0 = Gia_ManPo( pMiter, 2*i+0 );
+            pObj1 = Gia_ManPo( pMiter, 2*i+1 );
+            iVar0 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj0)];
+            iVar1 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj1)];
+            sat_solver_add_buffer( pSat, iVar0, iVar1, 0 );
+        }
+        Gia_ManForEachRi( p, pObj, i )
+        {
+            pObj0 = Gia_ManRi( pMiter, i );
+            pObj1 = Gia_ManRi( pMiter, i + Gia_ManRegNum(p) );
+            iVar0 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj0)];
+            iVar1 = pCnf->pVarNums[Gia_ObjId(pMiter, pObj1)];
+            sat_solver_add_buffer_enable( pSat, iVar0, iVar1, i, 0 );
+        }
+        // add timeframe clauses
+        for ( i = 0; i < pCnf->nClauses; i++ )
+            if ( !sat_solver_addclause( pSat, pCnf->pClauses[i], pCnf->pClauses[i+1] ) )
+                assert( 0 );
+
+        // collect literals
+        Vec_IntClear( vLits );
+        for ( i = 0; i < Gia_ManRegNum(p); i++ )
+            Vec_IntPush( vLits, Abc_Var2Lit(i, 0) );
+
+        // call the SAT solver
+    //    sat_solver_compress( pSat );
+        status = sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits), (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
+        assert( status == l_False );
+
+        // call analize_final
+        nLits = sat_solver_final( pSat, &pLits );
+        printf( "M = %d.  AIG =%8d.  SAT vars =%8d.  SAT conf =%8d.  S =%6d. (%6.2f %%)  ",
+            k+1, (k+1) * Gia_ManAndNum(pMiter), 
+            sat_solver_nvars(pSat), sat_solver_nconflicts(pSat),
+            nLits, 100.0 * nLits / Gia_ManRegNum(p) );
+        Abc_PrintTime( 1, "Time", Abc_Clock() - clkStart );
+    }
+
+    sat_solver_delete( pSat );
+    Cnf_DataFree( pCnf );
+    Gia_ManStop( pMiter );
+    Vec_IntFree( vLits );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/sat/bmc/module.make b/src/sat/bmc/module.make
index 82d18fde..07fab770 100644
--- a/src/sat/bmc/module.make
+++ b/src/sat/bmc/module.make
@@ -7,6 +7,7 @@ SRC +=    src/sat/bmc/bmcBmc.c \
     src/sat/bmc/bmcCexMin1.c \
     src/sat/bmc/bmcCexMin2.c \
     src/sat/bmc/bmcCexTools.c \
+    src/sat/bmc/bmcICheck.c \
     src/sat/bmc/bmcLoad.c \
     src/sat/bmc/bmcMulti.c \
     src/sat/bmc/bmcUnroll.c
diff --git a/src/sat/bsat/satSolver.h b/src/sat/bsat/satSolver.h
index 81202179..087bef8c 100644
--- a/src/sat/bsat/satSolver.h
+++ b/src/sat/bsat/satSolver.h
@@ -296,6 +296,25 @@ static inline int sat_solver_add_buffer( sat_solver * pSat, int iVarA, int iVarB
     assert( Cid );
     return 2;
 }
+static inline int sat_solver_add_buffer_enable( sat_solver * pSat, int iVarA, int iVarB, int iVarEn, int fCompl )
+{
+    lit Lits[3];
+    int Cid;
+    assert( iVarA >= 0 && iVarB >= 0 && iVarEn >= 0 );
+
+    Lits[0] = toLitCond( iVarA, 0 );
+    Lits[1] = toLitCond( iVarB, !fCompl );
+    Lits[2] = toLitCond( iVarEn, 1 );
+    Cid = sat_solver_addclause( pSat, Lits, Lits + 3 );
+    assert( Cid );
+
+    Lits[0] = toLitCond( iVarA, 1 );
+    Lits[1] = toLitCond( iVarB, fCompl );
+    Lits[2] = toLitCond( iVarEn, 1 );
+    Cid = sat_solver_addclause( pSat, Lits, Lits + 3 );
+    assert( Cid );
+    return 2;
+}
 static inline int sat_solver_add_and( sat_solver * pSat, int iVar, int iVar0, int iVar1, int fCompl0, int fCompl1 )
 {
     lit Lits[3];