Experiments with recent ideas.

2 files changed, 255 insertions, 0 deletions

diff --git a/src/sat/bmc/bmcTulip.c b/src/sat/bmc/bmcTulip.c
new file mode 100644
index 00000000..c29752d8
--- /dev/null
+++ b/src/sat/bmc/bmcTulip.c
@@ -0,0 +1,254 @@
+/**CFile****************************************************************
+
+  FileName    [bmcTulip.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based bounded model checking.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bmcTulip.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"
+#include "aig/gia/giaAig.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Cnf_Dat_t * Cnf_DeriveGiaRemapped( Gia_Man_t * p )
+{
+    Cnf_Dat_t * pCnf;
+    Aig_Man_t * pAig = Gia_ManToAigSimple( p );
+    pAig->nRegs = 0;
+    pCnf = Cnf_Derive( pAig, Aig_ManCoNum(pAig) );
+    Aig_ManStop( pAig );
+    return pCnf;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManTulipUnfold( Gia_Man_t * p, int nFrames, int fUseVars )
+{
+    Gia_Man_t * pNew, * pTemp;
+    Gia_Obj_t * pObj;
+    int i, f;
+    pNew = Gia_ManStart( fUseVars * 2 * Gia_ManRegNum(p) + nFrames * Gia_ManObjNum(p) );
+    pNew->pName = Abc_UtilStrsav( p->pName );
+    Gia_ManHashAlloc( pNew );
+    Gia_ManConst0(p)->Value = 0;
+    // control/data variables
+    Gia_ManForEachRo( p, pObj, i )
+        Gia_ManAppendCi( pNew );
+    Gia_ManForEachRo( p, pObj, i )
+        Gia_ManAppendCi( pNew );
+    // build timeframes
+    Gia_ManForEachRo( p, pObj, i )
+        pObj->Value = fUseVars ? Gia_ManHashAnd(pNew, Gia_ManCiLit(pNew, i), Gia_ManCiLit(pNew, Gia_ManRegNum(p)+i)) : 0;
+    for ( f = 0; f < nFrames; f++ )
+    {
+        Gia_ManForEachPi( p, pObj, i )
+            pObj->Value = Gia_ManAppendCi( pNew );
+        Gia_ManForEachAnd( p, pObj, i )
+            pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+        Gia_ManForEachRi( p, pObj, i )
+            pObj->Value = Gia_ObjFanin0Copy(pObj);
+        Gia_ManForEachRo( p, pObj, i )
+            pObj->Value = Gia_ObjRoToRi(p, pObj)->Value;
+    }
+    Gia_ManForEachRi( p, pObj, i )
+        pObj->Value = Gia_ManAppendCo( pNew, pObj->Value );
+    pNew = Gia_ManCleanup( pTemp = pNew );
+    Gia_ManStop( pTemp );
+    assert( Gia_ManPiNum(pNew) == 2 * Gia_ManRegNum(p) + nFrames * Gia_ManPiNum(p) );
+    return pNew;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Gia_ManTulip( Gia_Man_t * p, int nFrames, int nTimeOut, int fVerbose )
+{
+    int nIterMax = 1000000;
+    int i, iLit, Iter, status;
+    int nLits, * pLits;
+    abctime clkTotal = Abc_Clock();
+    abctime clkSat = 0;
+    Vec_Int_t * vLits, * vMap;
+    sat_solver * pSat;
+    Gia_Obj_t * pObj;
+    Gia_Man_t * p0 = Gia_ManTulipUnfold( p, nFrames, 0 );
+    Gia_Man_t * p1 = Gia_ManTulipUnfold( p, nFrames, 1 );
+    Gia_Man_t * pM = Gia_ManMiter( p0, p1, 0, 0, 0, 0, 0 );
+    Cnf_Dat_t * pCnf = Cnf_DeriveGiaRemapped( pM );
+    Gia_ManStop( p0 );
+    Gia_ManStop( p1 );
+    assert( Gia_ManRegNum(p) > 0 );
+
+    pSat = sat_solver_new();
+    sat_solver_setnvars( pSat, pCnf->nVars );
+    sat_solver_set_runtime_limit( pSat, nTimeOut ? nTimeOut * CLOCKS_PER_SEC + Abc_Clock(): 0 );
+    for ( i = 0; i < pCnf->nClauses; i++ )
+        if ( !sat_solver_addclause( pSat, pCnf->pClauses[i], pCnf->pClauses[i+1] ) )
+            assert( 0 );
+
+    // add one large OR clause
+    vLits = Vec_IntAlloc( Gia_ManCoNum(p) );
+    Gia_ManForEachCo( pM, pObj, i )
+        Vec_IntPush( vLits, Abc_Var2Lit(pCnf->pVarNums[Gia_ObjId(pM, pObj)], 0) );
+    sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits) );
+
+    // create assumptions
+    Vec_IntClear( vLits );
+    Gia_ManForEachPi( pM, pObj, i )
+        if ( i == Gia_ManRegNum(p) )
+            break;
+        else
+            Vec_IntPush( vLits, Abc_Var2Lit(pCnf->pVarNums[Gia_ObjId(pM, pObj)], 1) );
+
+    if ( fVerbose )
+    {
+        printf( "Iter%6d : ",       0 );
+        printf( "Var =%10d  ",      sat_solver_nvars(pSat) );
+        printf( "Clause =%10d  ",   sat_solver_nclauses(pSat) );
+        printf( "Conflict =%10d  ", sat_solver_nconflicts(pSat) );
+        printf( "Subset =%6d  ",    Gia_ManRegNum(p) );
+        Abc_PrintTime( 1, "Time", clkSat );
+//      ABC_PRTr( "Solver time", clkSat );
+    }
+    for ( Iter = 0; Iter < nIterMax; Iter++ )
+    {
+        abctime clk = Abc_Clock();
+        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 );
+        clkSat += Abc_Clock() - clk;
+        if ( status == l_Undef )
+        {
+//            if ( fVerbose )
+//                printf( "\n" );
+            printf( "Timeout reached after %d seconds and %d iterations.  ", nTimeOut, Iter );
+            break;
+        }
+        if ( status == l_True )
+        {
+//            if ( fVerbose )
+//                printf( "\n" );
+            printf( "The problem is SAT after %d iterations.  ", Iter );
+            break;
+        }
+        assert( status == l_False );
+        nLits = sat_solver_final( pSat, &pLits );
+        if ( fVerbose )
+        {
+            printf( "Iter%6d : ",       Iter+1 );
+            printf( "Var =%10d  ",      sat_solver_nvars(pSat) );
+            printf( "Clause =%10d  ",   sat_solver_nclauses(pSat) );
+            printf( "Conflict =%10d  ", sat_solver_nconflicts(pSat) );
+            printf( "Subset =%6d  ",    nLits );
+            Abc_PrintTime( 1, "Time", clkSat );
+//            ABC_PRTr( "Solver time", clkSat );
+        }
+        if ( Vec_IntSize(vLits) == nLits )
+        {
+//            if ( fVerbose )
+//                printf( "\n" );
+            printf( "Reached fixed point with %d entries after %d iterations.\n", Vec_IntSize(vLits), Iter+1 );
+            break;
+        }
+        // collect used literals
+        Vec_IntClear( vLits );
+        for ( i = 0; i < nLits; i++ )
+            Vec_IntPush( vLits, Abc_LitNot(pLits[i]) );
+    }
+    // create map
+    vMap = Vec_IntStart( pCnf->nVars );
+    Vec_IntForEachEntry( vLits, iLit, i )
+        Vec_IntWriteEntry( vMap, Abc_Lit2Var(iLit), 1 );
+    // create output
+    Vec_IntClear( vLits );
+    Gia_ManForEachPi( pM, pObj, i )
+        if ( i == Gia_ManRegNum(p) )
+            break;
+        else if ( Vec_IntEntry( vMap, pCnf->pVarNums[Gia_ObjId(pM, pObj)] ) )
+            Vec_IntPush( vLits, i );
+    Vec_IntFree( vMap );
+
+    // cleanup
+    sat_solver_delete( pSat );
+    Cnf_DataFree( pCnf );
+    Gia_ManStop( pM );
+    Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
+    return vLits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManTulipTest( Gia_Man_t * p, int nFrames, int nTimeOut, int fVerbose )
+{
+    Vec_Int_t * vRes;
+    vRes = Gia_ManTulip( p, nFrames, nTimeOut, fVerbose );
+    Vec_IntFree( vRes );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/sat/bmc/module.make b/src/sat/bmc/module.make
index 7f26bc04..ff9bca40 100644
--- a/src/sat/bmc/module.make
+++ b/src/sat/bmc/module.make
@@ -11,4 +11,5 @@ SRC +=    src/sat/bmc/bmcBmc.c \
     src/sat/bmc/bmcICheck.c \
     src/sat/bmc/bmcLoad.c \
     src/sat/bmc/bmcMulti.c \
+    src/sat/bmc/bmcTulip.c \
     src/sat/bmc/bmcUnroll.c