Exploration of MFFCs.

4 files changed, 219 insertions, 1 deletions

diff --git a/src/aig/gia/gia.h b/src/aig/gia/gia.h
index 5894c494..62b7c89a 100644
--- a/src/aig/gia/gia.h
+++ b/src/aig/gia/gia.h
@@ -901,6 +901,8 @@ static inline int         Gia_ObjLutFanin( Gia_Man_t * p, int Id, int i )   { re
     for ( i = 1; (i < p->nObjs) && ((pObj) = Gia_ManObj(p, i)); i++ )
 #define Gia_ManForEachObjVec( vVec, p, pObj, i )                        \
     for ( i = 0; (i < Vec_IntSize(vVec)) && ((pObj) = Gia_ManObj(p, Vec_IntEntry(vVec,i))); i++ )
+#define Gia_ManForEachObjVecReverse( vVec, p, pObj, i )                        \
+    for ( i = Vec_IntSize(vVec) - 1; (i >= 0) && ((pObj) = Gia_ManObj(p, Vec_IntEntry(vVec,i))); i-- )
 #define Gia_ManForEachObjVecLit( vVec, p, pObj, fCompl, i )             \
     for ( i = 0; (i < Vec_IntSize(vVec)) && ((pObj) = Gia_ManObj(p, Abc_Lit2Var(Vec_IntEntry(vVec,i)))) && (((fCompl) = Abc_LitIsCompl(Vec_IntEntry(vVec,i))),1); i++ )
 #define Gia_ManForEachObjReverse( p, pObj, i )                          \
diff --git a/src/aig/gia/giaTis.c b/src/aig/gia/giaTis.c
new file mode 100644
index 00000000..750b52c8
--- /dev/null
+++ b/src/aig/gia/giaTis.c
@@ -0,0 +1,213 @@
+/**CFile****************************************************************
+
+  FileName    [giaTis.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Scalable AIG package.]
+
+  Synopsis    [Technology independent synthesis.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: giaTis.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "gia.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Derives GIA with MUXes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_Man_t * Gia_ManTisDupMuxes( Gia_Man_t * p )
+{
+    Gia_Man_t * pNew, * pTemp;
+    Gia_Obj_t * pObj, * pFan0, * pFan1, * pFanC;
+    int i;
+    assert( p->pMuxes == NULL );
+    ABC_FREE( p->pRefs );
+    Gia_ManCreateRefs( p ); 
+    // start the new manager
+    pNew = Gia_ManStart( 5000 );
+    pNew->pName = Abc_UtilStrsav( p->pName );
+    pNew->pSpec = Abc_UtilStrsav( p->pSpec );
+    pNew->pMuxes = ABC_CALLOC( unsigned, pNew->nObjsAlloc );
+    // create constant
+    Gia_ManConst0(p)->Value = 0;
+    // create PIs
+    Gia_ManForEachCi( p, pObj, i )
+        pObj->Value = Gia_ManAppendCi( pNew );
+    // create internal nodes
+    Gia_ManHashStart( pNew );
+    Gia_ManForEachAnd( p, pObj, i )
+    {
+        if ( !Gia_ObjIsMuxType(pObj) || (Gia_ObjRefNum(p, Gia_ObjFanin0(pObj)) > 1 && Gia_ObjRefNum(p, Gia_ObjFanin1(pObj)) > 1) )
+            pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+        else if ( Gia_ObjRecognizeExor(pObj, &pFan0, &pFan1) )
+            pObj->Value = Gia_ManHashXorReal( pNew, Gia_ObjLitCopy(p, Gia_ObjToLit(p, pFan0)), Gia_ObjLitCopy(p, Gia_ObjToLit(p, pFan1)) );
+        else
+        {
+            pFanC = Gia_ObjRecognizeMux( pObj, &pFan1, &pFan0 );
+            pObj->Value = Gia_ManHashMuxReal( pNew, Gia_ObjLitCopy(p, Gia_ObjToLit(p, pFanC)), Gia_ObjLitCopy(p, Gia_ObjToLit(p, pFan1)), Gia_ObjLitCopy(p, Gia_ObjToLit(p, pFan0)) );
+        }
+    }
+    Gia_ManHashStop( pNew );
+    // create ROs
+    Gia_ManForEachCo( p, pObj, i )
+        pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
+    Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
+    // perform cleanup
+    pNew = Gia_ManCleanup( pTemp = pNew );
+    Gia_ManStop( pTemp );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManTisCollectMffc_rec( Gia_Man_t * p, int Id, Vec_Int_t * vMffc, Vec_Int_t * vLeaves )
+{
+    Gia_Obj_t * pObj;
+    if ( Gia_ObjIsTravIdCurrentId(p, Id) )
+        return;
+    Gia_ObjSetTravIdCurrentId(p, Id);
+    if ( Gia_ObjRefNumId(p, Id) > 1 )
+    {
+        Vec_IntPush( vLeaves, Id );
+        return;
+    }
+    pObj = Gia_ManObj( p, Id );
+    if ( Gia_ObjIsCi(pObj) )
+    {
+        Vec_IntPush( vLeaves, Id );
+        return;
+    }
+    assert( Gia_ObjIsAnd(pObj) );
+    Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId0(pObj, Id), vMffc, vLeaves );
+    Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId1(pObj, Id), vMffc, vLeaves );
+    if ( Gia_ObjIsMuxId(p, Id) )
+        Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId2(p, Id), vMffc, vLeaves );
+    Vec_IntPush( vMffc, Id );
+}
+void Gia_ManTisCollectMffc( Gia_Man_t * p, int Id, Vec_Int_t * vMffc, Vec_Int_t * vLeaves )
+{
+    Gia_Obj_t * pObj = Gia_ManObj( p, Id );
+    assert( Gia_ObjIsAnd(pObj) );
+    Vec_IntClear( vMffc );
+    Vec_IntClear( vLeaves );
+    Gia_ManIncrementTravId( p );
+    Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId0(pObj, Id), vMffc, vLeaves );
+    Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId1(pObj, Id), vMffc, vLeaves );
+    if ( Gia_ObjIsMuxId(p, Id) )
+        Gia_ManTisCollectMffc_rec( p, Gia_ObjFaninId2(p, Id), vMffc, vLeaves );
+    Vec_IntPush( vMffc, Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManTisPrintMffc( Gia_Man_t * p, int Id, Vec_Int_t * vMffc, Vec_Int_t * vLeaves )
+{
+    Gia_Obj_t * pObj;
+    int i;
+    printf( "MFFC %d has %d nodes and %d leaves:\n", Id, Vec_IntSize(vMffc), Vec_IntSize(vLeaves) );
+    Gia_ManForEachObjVecReverse( vMffc, p, pObj, i )
+    {
+        printf( "Node %2d : ", Vec_IntSize(vMffc) - 1 - i );
+        Gia_ObjPrint( p, pObj );
+    }
+    Gia_ManForEachObjVec( vLeaves, p, pObj, i )
+    {
+        printf( "Leaf %2d : ", i );
+        Gia_ObjPrint( p, pObj );
+    }
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManTisTest( Gia_Man_t * pInit )
+{
+    Gia_Man_t * p;
+    Gia_Obj_t * pObj;
+    Vec_Int_t * vMffc, * vLeaves;
+    int i;
+    vMffc = Vec_IntAlloc( 10 );
+    vLeaves = Vec_IntAlloc( 10 );
+    p = Gia_ManTisDupMuxes( pInit );
+    Gia_ManCreateRefs( p );
+    Gia_ManForEachAnd( p, pObj, i )
+    {
+        if ( Gia_ObjRefNumId(p, i) == 1 )
+            continue;
+        Gia_ManTisCollectMffc( p, i, vMffc, vLeaves );
+        Gia_ManTisPrintMffc( p, i, vMffc, vLeaves );
+    }
+    Gia_ManForEachCo( p, pObj, i )
+    {
+        if ( Gia_ObjRefNumId(p, Gia_ObjFaninId0p(p, pObj)) > 1 )
+            continue;
+        Gia_ManTisCollectMffc( p, Gia_ObjFaninId0p(p, pObj), vMffc, vLeaves );
+        Gia_ManTisPrintMffc( p, Gia_ObjFaninId0p(p, pObj), vMffc, vLeaves );
+    }
+    Gia_ManStop( p );
+    Vec_IntFree( vMffc );
+    Vec_IntFree( vLeaves );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/aig/gia/module.make b/src/aig/gia/module.make
index 42c2f0fd..d2278e95 100644
--- a/src/aig/gia/module.make
+++ b/src/aig/gia/module.make
@@ -54,6 +54,7 @@ SRC +=    src/aig/gia/giaAig.c \
     src/aig/gia/giaSweeper.c \
     src/aig/gia/giaSwitch.c \
     src/aig/gia/giaTim.c \
+    src/aig/gia/giaTis.c \
     src/aig/gia/giaTruth.c \
     src/aig/gia/giaTsim.c \
     src/aig/gia/giaUtil.c
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 00ff365f..0d4123da 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -34891,6 +34891,7 @@ int Abc_CommandAbc9Test( Abc_Frame_t * pAbc, int argc, char ** argv )
 //    extern void Agi_ManTest( Gia_Man_t * pGia );
 //    extern void Gia_ManCheckFalseTest( Gia_Man_t * p, int nSlackMax );
 //    extern void Gia_ParTest( Gia_Man_t * p, int nWords, int nProcs );
+    extern void Gia_ManTisTest( Gia_Man_t * pInit );
 
     Extra_UtilGetoptReset();
     while ( ( c = Extra_UtilGetopt( argc, argv, "WPFsvh" ) ) != EOF )
@@ -34994,7 +34995,8 @@ int Abc_CommandAbc9Test( Abc_Frame_t * pAbc, int argc, char ** argv )
 //    Jf_ManTestCnf( pAbc->pGia );
 //    Gia_ManCheckFalseTest( pAbc->pGia, nFrames );
 //    Gia_ParTest( pAbc->pGia, nWords, nProcs );
-    printf( "\nThis command is currently disabled.\n\n" );
+    Gia_ManTisTest( pAbc->pGia );
+//    printf( "\nThis command is currently disabled.\n\n" );
 
     return 0;
 usage: