Version abc70930

1 files changed, 371 insertions, 0 deletions

diff --git a/abc70930/src/aig/cnf/cnfCut.c b/abc70930/src/aig/cnf/cnfCut.c
new file mode 100644
index 00000000..17ab0c78
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfCut.c
@@ -0,0 +1,371 @@
+/**CFile****************************************************************
+
+  FileName    [cnfCut.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfCut.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutAlloc( Cnf_Man_t * p, int nLeaves )
+{
+    Cnf_Cut_t * pCut;
+    int nSize = sizeof(Cnf_Cut_t) + sizeof(int) * nLeaves + sizeof(unsigned) * Aig_TruthWordNum(nLeaves);
+    pCut = (Cnf_Cut_t *)Aig_MmFlexEntryFetch( p->pMemCuts, nSize );
+    pCut->nFanins = nLeaves;
+    pCut->nWords = Aig_TruthWordNum(nLeaves);
+    pCut->vIsop[0] = pCut->vIsop[1] = NULL;
+    return pCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutFree( Cnf_Cut_t * pCut )
+{
+    if ( pCut->vIsop[0] )
+        Vec_IntFree( pCut->vIsop[0] );
+    if ( pCut->vIsop[1] )
+        Vec_IntFree( pCut->vIsop[1] );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates cut for the given node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutCreate( Cnf_Man_t * p, Aig_Obj_t * pObj )
+{
+    Dar_Cut_t * pCutBest;
+    Cnf_Cut_t * pCut;
+    unsigned * pTruth;
+    assert( Aig_ObjIsNode(pObj) );
+    pCutBest = Dar_ObjBestCut( pObj );
+    assert( pCutBest != NULL );
+    assert( pCutBest->nLeaves <= 4 );
+    pCut = Cnf_CutAlloc( p, pCutBest->nLeaves );
+    memcpy( pCut->pFanins, pCutBest->pLeaves, sizeof(int) * pCutBest->nLeaves );
+    pTruth = Cnf_CutTruth(pCut);
+    *pTruth = (pCutBest->uTruth << 16) | pCutBest->uTruth;
+    pCut->Cost = Cnf_CutSopCost( p, pCutBest );
+    return pCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutPrint( Cnf_Cut_t * pCut )
+{
+    int i;
+    printf( "{" );
+    for ( i = 0; i < pCut->nFanins; i++ )
+        printf( "%d ", pCut->pFanins[i] );
+    printf( " } " );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutDeref( Cnf_Man_t * p, Cnf_Cut_t * pCut )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Cnf_CutForEachLeaf( p->pManAig, pCut, pObj, i )
+    {
+        assert( pObj->nRefs > 0 );
+        pObj->nRefs--;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutRef( Cnf_Man_t * p, Cnf_Cut_t * pCut )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Cnf_CutForEachLeaf( p->pManAig, pCut, pObj, i )
+    {
+        pObj->nRefs++;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutUpdateRefs( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, Cnf_Cut_t * pCutRes )
+{
+    Cnf_CutDeref( p, pCut );
+    Cnf_CutDeref( p, pCutFan );
+    Cnf_CutRef( p, pCutRes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two arrays of integers.]
+
+  Description [Returns the number of items.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Cnf_CutMergeLeaves( Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, int * pFanins )
+{
+    int i, k, nFanins = 0;
+    for ( i = k = 0; i < pCut->nFanins && k < pCutFan->nFanins; )
+    {
+        if ( pCut->pFanins[i] == pCutFan->pFanins[k] )
+            pFanins[nFanins++] = pCut->pFanins[i], i++, k++;
+        else if ( pCut->pFanins[i] < pCutFan->pFanins[k] )
+            pFanins[nFanins++] = pCut->pFanins[i], i++;
+        else
+            pFanins[nFanins++] = pCutFan->pFanins[k], k++;
+    }
+    for ( ; i < pCut->nFanins; i++ )
+        pFanins[nFanins++] = pCut->pFanins[i];
+    for ( ; k < pCutFan->nFanins; k++ )
+        pFanins[nFanins++] = pCutFan->pFanins[k];
+    return nFanins;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the stretching phase of the cut w.r.t. the merged cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Cnf_TruthPhase( Cnf_Cut_t * pCut, Cnf_Cut_t * pCut1 )
+{
+    unsigned uPhase = 0;
+    int i, k;
+    for ( i = k = 0; i < pCut->nFanins; i++ )
+    {
+        if ( k == pCut1->nFanins )
+            break;
+        if ( pCut->pFanins[i] < pCut1->pFanins[k] )
+            continue;
+        assert( pCut->pFanins[i] == pCut1->pFanins[k] );
+        uPhase |= (1 << i);
+        k++;
+    }
+    return uPhase;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes the fanin variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutRemoveIthVar( Cnf_Cut_t * pCut, int iVar, int iFan )
+{
+    int i;
+    assert( pCut->pFanins[iVar] == iFan );
+    pCut->nFanins--;
+    for ( i = iVar; i < pCut->nFanins; i++ )
+        pCut->pFanins[i] = pCut->pFanins[i+1];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts the fanin variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutInsertIthVar( Cnf_Cut_t * pCut, int iVar, int iFan )
+{
+    int i;
+    for ( i = pCut->nFanins; i > iVar; i-- )
+        pCut->pFanins[i] = pCut->pFanins[i-1];
+    pCut->pFanins[iVar] = iFan;
+    pCut->nFanins++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two cuts.]
+
+  Description [Returns NULL of the cuts cannot be merged.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutCompose( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, int iFan )
+{
+    Cnf_Cut_t * pCutRes;
+    static int pFanins[32];
+    unsigned * pTruth, * pTruthFan, * pTruthRes;
+    unsigned * pTop = p->pTruths[0], * pFan = p->pTruths[2], * pTemp = p->pTruths[3];
+    unsigned uPhase, uPhaseFan;
+    int i, iVar, nFanins, RetValue;
+
+    // make sure the second cut is the fanin of the first
+    for ( iVar = 0; iVar < pCut->nFanins; iVar++ )
+        if ( pCut->pFanins[iVar] == iFan )
+            break;
+    assert( iVar < pCut->nFanins );
+    // remove this variable
+    Cnf_CutRemoveIthVar( pCut, iVar, iFan );
+    // merge leaves of the cuts
+    nFanins = Cnf_CutMergeLeaves( pCut, pCutFan, pFanins );
+    if ( nFanins+1 > p->nMergeLimit )
+    {
+        Cnf_CutInsertIthVar( pCut, iVar, iFan );
+        return NULL;
+    }
+    // create new cut
+    pCutRes = Cnf_CutAlloc( p, nFanins );
+    memcpy( pCutRes->pFanins, pFanins, sizeof(int) * nFanins );
+    assert( pCutRes->nFanins <= pCut->nFanins + pCutFan->nFanins );
+
+    // derive its truth table
+    // get the truth tables in the composition space
+    pTruth    = Cnf_CutTruth(pCut);
+    pTruthFan = Cnf_CutTruth(pCutFan);
+    pTruthRes = Cnf_CutTruth(pCutRes);
+    for ( i = 0; i < 2*pCutRes->nWords; i++ )
+        pTop[i] = pTruth[i % pCut->nWords];
+    for ( i = 0; i < pCutRes->nWords; i++ )
+        pFan[i] = pTruthFan[i % pCutFan->nWords];
+    // move the variable to the end
+    uPhase = Kit_BitMask( pCutRes->nFanins+1 ) & ~(1 << iVar);
+    Kit_TruthShrink( pTemp, pTop, pCutRes->nFanins, pCutRes->nFanins+1, uPhase, 1 );
+    // compute the phases
+    uPhase    = Cnf_TruthPhase( pCutRes, pCut    ) | (1 << pCutRes->nFanins);
+    uPhaseFan = Cnf_TruthPhase( pCutRes, pCutFan );
+    // permute truth-tables to the common support
+    Kit_TruthStretch( pTemp, pTop, pCut->nFanins+1,  pCutRes->nFanins+1, uPhase,    1 );
+    Kit_TruthStretch( pTemp, pFan, pCutFan->nFanins, pCutRes->nFanins,   uPhaseFan, 1 );
+    // perform Boolean operation
+    Kit_TruthMux( pTruthRes, pTop, pTop+pCutRes->nWords, pFan, pCutRes->nFanins );
+    // return the cut to its original condition
+    Cnf_CutInsertIthVar( pCut, iVar, iFan );
+    // consider the simple case
+    if ( pCutRes->nFanins < 5 )
+    {
+        pCutRes->Cost = p->pSopSizes[0xFFFF & *pTruthRes] + p->pSopSizes[0xFFFF & ~*pTruthRes];
+        return pCutRes;
+    }
+
+    // derive ISOP for positive phase
+    RetValue = Kit_TruthIsop( pTruthRes, pCutRes->nFanins, p->vMemory, 0 );
+    pCutRes->vIsop[1] = (RetValue == -1)? NULL : Vec_IntDup( p->vMemory );
+    // derive ISOP for negative phase
+    Kit_TruthNot( pTruthRes, pTruthRes, pCutRes->nFanins );
+    RetValue = Kit_TruthIsop( pTruthRes, pCutRes->nFanins, p->vMemory, 0 );
+    pCutRes->vIsop[0] = (RetValue == -1)? NULL : Vec_IntDup( p->vMemory );
+    Kit_TruthNot( pTruthRes, pTruthRes, pCutRes->nFanins );
+
+    // compute the cut cost
+    if ( pCutRes->vIsop[0] == NULL || pCutRes->vIsop[1] == NULL )
+        pCutRes->Cost = 127;
+    else if ( Vec_IntSize(pCutRes->vIsop[0]) + Vec_IntSize(pCutRes->vIsop[1]) > 127 )
+        pCutRes->Cost = 127;
+    else
+        pCutRes->Cost = Vec_IntSize(pCutRes->vIsop[0]) + Vec_IntSize(pCutRes->vIsop[1]);
+    return pCutRes;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+