Windowing for technology mapping.

1 files changed, 385 insertions, 0 deletions

diff --git a/src/aig/gia/giaSplit.c b/src/aig/gia/giaSplit.c
new file mode 100644
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+++ b/src/aig/gia/giaSplit.c
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+/**CFile****************************************************************
+
+  FileName    [giaSplit.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Scalable AIG package.]
+
+  Synopsis    [Structural AIG splitting.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: giaSplit.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "gia.h"
+#include "misc/extra/extra.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Spl_Man_t_ Spl_Man_t;
+struct Spl_Man_t_
+{
+    // input data
+    Gia_Man_t *      pGia;       // user AIG with nodes marked
+    int              iObj;       // object ID
+    int              Limit;      // limit on AIG nodes
+    int              Count;      // count of AIG nodes
+    // intermediate
+    Vec_Bit_t *      vMarksCIO;  // CI/CO marks
+    Vec_Bit_t *      vMarksIn;   // input marks
+    Vec_Bit_t *      vMarksNo;   // node marks
+    Vec_Int_t *      vNodes;     // nodes used in the window
+    Vec_Int_t *      vRoots;     // nodes pointing to Nodes
+    Vec_Int_t *      vLeaves;    // nodes pointed by Nodes
+    // temporary 
+    Vec_Int_t *      vFanouts;   // fanouts of the node
+    Vec_Int_t *      vCands;     // candidate nodes
+    Vec_Int_t *      vInputs;    // non-trivial inputs
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Spl_Man_t * Spl_ManAlloc( Gia_Man_t * pGia, int Limit )
+{
+    int i, iObj;
+    Spl_Man_t * p = ABC_CALLOC( Spl_Man_t, 1 );
+    assert( Gia_ManHasMapping(pGia) );
+    p->pGia       = pGia;
+    p->Limit      = Limit;
+    // intermediate
+    p->vMarksCIO  = Vec_BitStart( Gia_ManObjNum(pGia) );
+    p->vMarksIn   = Vec_BitStart( Gia_ManObjNum(pGia) );
+    p->vMarksNo   = Vec_BitStart( Gia_ManObjNum(pGia) );
+    p->vRoots     = Vec_IntAlloc( 100 );
+    p->vNodes     = Vec_IntAlloc( 100 );
+    p->vLeaves    = Vec_IntAlloc( 100 );
+    // temporary 
+    p->vFanouts   = Vec_IntAlloc( 100 );
+    p->vCands     = Vec_IntAlloc( 100 );
+    p->vInputs    = Vec_IntAlloc( 100 );
+    // mark CIs/COs
+    Gia_ManForEachCiId( pGia, iObj, i )
+        Vec_BitWriteEntry( p->vMarksCIO, iObj, 1 );
+    Gia_ManForEachCoId( pGia, iObj, i )
+        Vec_BitWriteEntry( p->vMarksCIO, iObj, 1 );
+    // prepare AIG
+    Gia_ManStaticFanoutStart( pGia );
+    Gia_ManSetLutRefs( pGia );
+    Gia_ManCreateRefs( pGia );
+    return p;
+}
+void Spl_ManStop( Spl_Man_t * p )
+{
+    Gia_ManStaticFanoutStop( p->pGia );
+    // intermediate
+    Vec_BitFree( p->vMarksCIO );
+    Vec_BitFree( p->vMarksIn );
+    Vec_BitFree( p->vMarksNo );
+    Vec_IntFree( p->vRoots );
+    Vec_IntFree( p->vNodes );
+    Vec_IntFree( p->vLeaves );
+    // temporary 
+    Vec_IntFree( p->vFanouts );
+    Vec_IntFree( p->vCands );
+    Vec_IntFree( p->vInputs );
+    ABC_FREE( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Takes Nodes and Marks. Returns Leaves and Roots.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Spl_ManWinFindLeavesRoots( Spl_Man_t * p )
+{
+    int iObj, iFan, i, k;
+    // collect leaves
+    Vec_IntClear( p->vLeaves );
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+    {
+        assert( Vec_BitEntry(p->vMarksNo, iObj) );
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            if ( !Vec_BitEntry(p->vMarksNo, iFan) )
+            {
+                Vec_BitWriteEntry(p->vMarksNo, iFan, 1);
+                Vec_IntPush( p->vLeaves, iFan );
+            }
+    }
+    Vec_IntForEachEntry( p->vLeaves, iObj, i )
+        Vec_BitWriteEntry(p->vMarksNo, iObj, 0);
+    // collect roots
+    Vec_IntClear( p->vRoots );
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            Gia_ObjLutRefDecId( p->pGia, iFan );
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        if ( Gia_ObjLutRefNumId(p->pGia, iObj) )
+            Vec_IntPush( p->vRoots, iObj );
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            Gia_ObjLutRefIncId( p->pGia, iFan );
+}
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes LUTs that are fanouts of the node outside of the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Spl_ManLutFanouts_rec( Gia_Man_t * p, int iObj, Vec_Int_t * vFanouts, Vec_Bit_t * vMarksNo, Vec_Bit_t * vMarksCIO )
+{
+    int iFanout, i;
+    if ( Vec_BitEntry(vMarksNo, iObj) || Vec_BitEntry(vMarksCIO, iObj) )
+        return;
+    if ( Gia_ObjIsLut(p, iObj) )
+    {
+        Vec_BitWriteEntry( vMarksCIO, iObj, 1 );
+        Vec_IntPush( vFanouts, iObj );
+        return;
+    }
+    Gia_ObjForEachFanoutStaticId( p, iObj, iFanout, i )
+        Spl_ManLutFanouts_rec( p, iFanout, vFanouts, vMarksNo, vMarksCIO );
+}
+int Spl_ManLutFanouts( Gia_Man_t * p, int iObj, Vec_Int_t * vFanouts, Vec_Bit_t * vMarksNo, Vec_Bit_t * vMarksCIO )
+{
+    int i, iFanout;
+    assert( Gia_ObjIsLut(p, iObj) );
+    Vec_IntClear( vFanouts );
+    Gia_ObjForEachFanoutStaticId( p, iObj, iFanout, i )
+        Spl_ManLutFanouts_rec( p, iFanout, vFanouts, vMarksNo, vMarksCIO );
+    // clean up
+    Vec_IntForEachEntry( vFanouts, iFanout, i )
+        Vec_BitWriteEntry( vMarksCIO, iFanout, 0 );
+    return Vec_IntSize(vFanouts);
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Compute MFFC size of one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Spl_ManLutMffcSize( Gia_Man_t * p, int iObj )
+{
+    int Res, iFan, i;
+    assert( Gia_ObjIsLut(p, iObj) );
+    Gia_LutForEachFanin( p, iObj, iFan, i )
+        Gia_ObjRefIncId( p, iFan );
+    Res = Gia_NodeMffcSize( p, Gia_ManObj(p, iObj) );
+    Gia_LutForEachFanin( p, iObj, iFan, i )
+        Gia_ObjRefDecId( p, iFan );
+    return Res;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of fanins not beloning to the set.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Spl_ManCountMarkedFanins( Gia_Man_t * p, int iObj, Vec_Bit_t * vMarks )
+{
+    int k, iFan, Count = 0;
+    Gia_LutForEachFanin( p, iObj, iFan, k )
+        if ( Vec_BitEntry(vMarks, iFan) )
+            Count++;
+    return Count;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Spl_ManFindOne( Spl_Man_t * p )
+{
+    int nFanouts, iObj, iFan, i, k;
+    int Res = 0, InCount, InCountMax = -1; 
+    Vec_IntClear( p->vCands );
+    Vec_IntClear( p->vInputs );
+    // deref
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            Gia_ObjLutRefDecId( p->pGia, iFan );
+    // consider LUT inputs - get one that has no refs
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            if ( !Vec_BitEntry(p->vMarksNo, iFan) && !Vec_BitEntry(p->vMarksCIO, iFan) )
+            {
+                if ( !Gia_ObjLutRefNumId(p->pGia, iFan) )
+                {
+                    Res = iFan;
+                    goto finish;
+                }
+                Vec_IntPush( p->vCands, iFan );
+                Vec_IntPush( p->vInputs, iFan );
+            }
+
+    // all inputs have refs - collect external nodes
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+    {
+        if ( Gia_ObjLutRefNumId(p->pGia, iObj) == 0 )
+            continue;
+        assert( Gia_ObjLutRefNumId(p->pGia, iObj) > 0 );
+        if ( Gia_ObjLutRefNumId(p->pGia, iObj) >= 5 )
+            continue;
+        nFanouts = Spl_ManLutFanouts( p->pGia, iObj, p->vFanouts, p->vMarksNo, p->vMarksCIO );
+        if ( Gia_ObjLutRefNumId(p->pGia, iObj) == 1 && nFanouts == 1 )
+        {
+            Res = Vec_IntEntry(p->vFanouts, 0);
+            goto finish;
+        }
+        Vec_IntAppend( p->vCands, p->vFanouts );
+    }
+
+    // mark leaves
+    Vec_IntForEachEntry( p->vInputs, iObj, i )
+        Vec_BitWriteEntry( p->vMarksIn, iObj, 1 );
+    // find candidate with maximum input overlap
+    Vec_IntForEachEntry( p->vCands, iObj, i )
+    {
+        InCount = Spl_ManCountMarkedFanins( p->pGia, iObj, p->vMarksIn );
+        if ( InCountMax < InCount )
+        {
+            InCountMax = InCount;
+            Res = iObj;
+        }
+    }
+    // unmark leaves
+    Vec_IntForEachEntry( p->vInputs, iObj, i )
+        Vec_BitWriteEntry( p->vMarksIn, iObj, 0 );
+
+    // get the first candidate
+    if ( Res == 0 && Vec_IntSize(p->vCands) > 0 )
+        Res = Vec_IntEntry( p->vCands, 0 );
+
+finish:
+    // deref
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Gia_LutForEachFanin( p->pGia, iObj, iFan, k )
+            Gia_ObjLutRefIncId( p->pGia, iFan );
+    return Res;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Spl_ManComputeOne( Spl_Man_t * p, int iPivot )
+{
+    int CountAdd, iObj, i;
+    assert( Gia_ObjIsLut(p->pGia, iPivot) );
+    // assume it was previously filled in
+    Vec_IntForEachEntry( p->vNodes, iObj, i )
+        Vec_BitWriteEntry( p->vMarksNo, iObj, 0 );
+    // double check that it is empty
+    //Gia_ManForEachLut( p->pGia, iObj )
+    //    assert( !Vec_BitEntry(p->vMarksNo, iObj) );
+    // add root node
+    Vec_IntFill( p->vNodes, 1, iPivot );
+    Vec_BitWriteEntry( p->vMarksNo, iPivot, 1 );
+    //printf( "%d ", iPivot );
+    // add one node at a time
+    p->Count = Spl_ManLutMffcSize( p->pGia, iPivot );
+    while ( (iObj = Spl_ManFindOne(p)) )
+    {
+        assert( Gia_ObjIsLut(p->pGia, iObj) );
+        CountAdd = Spl_ManLutMffcSize( p->pGia, iObj );
+        if ( p->Count + CountAdd > p->Limit )
+            break;
+        p->Count += CountAdd;
+        Vec_IntPush( p->vNodes, iObj );
+        Vec_BitWriteEntry( p->vMarksNo, iObj, 1 );
+        //printf( "+%d ", iObj );
+    }
+    //printf( "\n" );
+    Vec_IntSort( p->vNodes, 0 );
+}
+
+void Spl_ManComputeOneTest( Gia_Man_t * pGia )
+{
+    int iLut;
+    Spl_Man_t * p = Spl_ManAlloc( pGia, 64 );
+    Gia_ManForEachLut( pGia, iLut )
+    {
+        Spl_ManComputeOne( p, iLut );
+        Spl_ManWinFindLeavesRoots( p );
+        // Vec_IntPrint( p->vNodes );
+        printf( "Obj = %6d : Leaf = %2d.  Node = %2d.  Root = %2d.    AND = %3d.\n", 
+            iLut, Vec_IntSize(p->vLeaves), Vec_IntSize(p->vNodes), Vec_IntSize(p->vRoots), p->Count ); 
+    }
+    Spl_ManStop( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+