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/**CFile****************************************************************
FileName [ivyCutTrav.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006.]
Revision [$Id: ivyCutTrav.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ivy.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static unsigned * Ivy_NodeCutElementary( Vec_Int_t * vStore, int nWords, int NodeId );
static void Ivy_NodeComputeVolume( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront );
static void Ivy_NodeFindCutsMerge( Vec_Ptr_t * vCuts0, Vec_Ptr_t * vCuts1, Vec_Ptr_t * vCuts, int nLeaves, int nWords, Vec_Int_t * vStore );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes cuts for one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Store_t * Ivy_NodeFindCutsTravAll( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves, int nNodeLimit,
Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront, Vec_Int_t * vStore, Vec_Vec_t * vBitCuts )
{
static Ivy_Store_t CutStore, * pCutStore = &CutStore;
Vec_Ptr_t * vCuts, * vCuts0, * vCuts1;
unsigned * pBitCut;
Ivy_Obj_t * pLeaf;
Ivy_Cut_t * pCut;
int i, k, nWords, nNodes;
assert( nLeaves <= IVY_CUT_INPUT );
// find the given number of nodes in the TFI
Ivy_NodeComputeVolume( pObj, nNodeLimit - 1, vNodes, vFront );
nNodes = Vec_PtrSize(vNodes);
// assert( nNodes <= nNodeLimit );
// make sure vBitCuts has enough room
Vec_VecExpand( vBitCuts, nNodes-1 );
Vec_VecClear( vBitCuts );
// prepare the memory manager
Vec_IntClear( vStore );
Vec_IntGrow( vStore, 64000 );
// set elementary cuts for the leaves
nWords = Extra_BitWordNum( nNodes );
Vec_PtrForEachEntry( vFront, pLeaf, i )
{
assert( Ivy_ObjTravId(pLeaf) < nNodes );
// get the new bitcut
pBitCut = Ivy_NodeCutElementary( vStore, nWords, Ivy_ObjTravId(pLeaf) );
// set it as the cut of this leaf
Vec_VecPush( vBitCuts, Ivy_ObjTravId(pLeaf), pBitCut );
}
// compute the cuts for each node
Vec_PtrForEachEntry( vNodes, pLeaf, i )
{
// skip the leaves
vCuts = Vec_VecEntry( vBitCuts, Ivy_ObjTravId(pLeaf) );
if ( Vec_PtrSize(vCuts) > 0 )
continue;
// add elementary cut
pBitCut = Ivy_NodeCutElementary( vStore, nWords, Ivy_ObjTravId(pLeaf) );
// set it as the cut of this leaf
Vec_VecPush( vBitCuts, Ivy_ObjTravId(pLeaf), pBitCut );
// get the fanin cuts
vCuts0 = Vec_VecEntry( vBitCuts, Ivy_ObjTravId( Ivy_ObjFanin0(pLeaf) ) );
vCuts1 = Vec_VecEntry( vBitCuts, Ivy_ObjTravId( Ivy_ObjFanin1(pLeaf) ) );
assert( Vec_PtrSize(vCuts0) > 0 );
assert( Vec_PtrSize(vCuts1) > 0 );
// merge the cuts
Ivy_NodeFindCutsMerge( vCuts0, vCuts1, vCuts, nLeaves, nWords, vStore );
}
// start the structure
pCutStore->nCuts = 0;
pCutStore->nCutsMax = IVY_CUT_LIMIT;
// collect the cuts of the root node
vCuts = Vec_VecEntry( vBitCuts, Ivy_ObjTravId(pObj) );
Vec_PtrForEachEntry( vCuts, pBitCut, i )
{
pCut = pCutStore->pCuts + pCutStore->nCuts++;
pCut->nSize = 0;
pCut->nSizeMax = nLeaves;
pCut->uHash = 0;
for ( k = 0; k < nNodes; k++ )
if ( Extra_TruthHasBit(pBitCut, k) )
pCut->pArray[ pCut->nSize++ ] = Ivy_ObjId( Vec_PtrEntry(vNodes, k) );
assert( pCut->nSize <= nLeaves );
if ( pCutStore->nCuts == pCutStore->nCutsMax )
break;
}
// clean the travIds
Vec_PtrForEachEntry( vNodes, pLeaf, i )
pLeaf->TravId = 0;
return pCutStore;
}
/**Function*************************************************************
Synopsis [Creates elementary bit-cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned * Ivy_NodeCutElementary( Vec_Int_t * vStore, int nWords, int NodeId )
{
unsigned * pBitCut;
pBitCut = Vec_IntFetch( vStore, nWords );
memset( pBitCut, 0, 4 * nWords );
Extra_TruthSetBit( pBitCut, NodeId );
return pBitCut;
}
/**Function*************************************************************
Synopsis [Compares the node by level.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_CompareNodesByLevel( Ivy_Obj_t ** ppObj1, Ivy_Obj_t ** ppObj2 )
{
Ivy_Obj_t * pObj1 = *ppObj1;
Ivy_Obj_t * pObj2 = *ppObj2;
if ( pObj1->Level < pObj2->Level )
return -1;
if ( pObj1->Level > pObj2->Level )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Mark all nodes up to the given depth.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeComputeVolumeTrav1_rec( Ivy_Obj_t * pObj, int Depth )
{
if ( Ivy_ObjIsCi(pObj) || Depth == 0 )
return;
Ivy_NodeComputeVolumeTrav1_rec( Ivy_ObjFanin0(pObj), Depth - 1 );
Ivy_NodeComputeVolumeTrav1_rec( Ivy_ObjFanin1(pObj), Depth - 1 );
pObj->fMarkA = 1;
}
/**Function*************************************************************
Synopsis [Collect the marked nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeComputeVolumeTrav2_rec( Ivy_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
if ( !pObj->fMarkA )
return;
Ivy_NodeComputeVolumeTrav2_rec( Ivy_ObjFanin0(pObj), vNodes );
Ivy_NodeComputeVolumeTrav2_rec( Ivy_ObjFanin1(pObj), vNodes );
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeComputeVolume( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront )
{
Ivy_Obj_t * pTemp, * pFanin;
int i, nNodes;
// mark nodes up to the given depth
Ivy_NodeComputeVolumeTrav1_rec( pObj, 6 );
// collect the marked nodes
Vec_PtrClear( vFront );
Ivy_NodeComputeVolumeTrav2_rec( pObj, vFront );
// find the fanins that are not marked
Vec_PtrClear( vNodes );
Vec_PtrForEachEntry( vFront, pTemp, i )
{
pFanin = Ivy_ObjFanin0(pTemp);
if ( !pFanin->fMarkA )
{
pFanin->fMarkA = 1;
Vec_PtrPush( vNodes, pFanin );
}
pFanin = Ivy_ObjFanin1(pTemp);
if ( !pFanin->fMarkA )
{
pFanin->fMarkA = 1;
Vec_PtrPush( vNodes, pFanin );
}
}
// remember the number of nodes in the frontier
nNodes = Vec_PtrSize( vNodes );
// add the remaining nodes
Vec_PtrForEachEntry( vFront, pTemp, i )
Vec_PtrPush( vNodes, pTemp );
// unmark the nodes
Vec_PtrForEachEntry( vNodes, pTemp, i )
{
pTemp->fMarkA = 0;
pTemp->TravId = i;
}
// collect the frontier nodes
Vec_PtrClear( vFront );
Vec_PtrForEachEntryStop( vNodes, pTemp, i, nNodes )
Vec_PtrPush( vFront, pTemp );
// printf( "%d ", Vec_PtrSize(vNodes) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeComputeVolume2( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront )
{
Ivy_Obj_t * pLeaf, * pPivot, * pFanin;
int LevelMax, i;
assert( Ivy_ObjIsNode(pObj) );
// clear arrays
Vec_PtrClear( vNodes );
Vec_PtrClear( vFront );
// add the root
pObj->fMarkA = 1;
Vec_PtrPush( vNodes, pObj );
Vec_PtrPush( vFront, pObj );
// expand node with maximum level
LevelMax = pObj->Level;
do {
// get the node to expand
pPivot = NULL;
Vec_PtrForEachEntryReverse( vFront, pLeaf, i )
{
if ( (int)pLeaf->Level == LevelMax )
{
pPivot = pLeaf;
break;
}
}
// decrease level if we did not find the node
if ( pPivot == NULL )
{
if ( --LevelMax == 0 )
break;
continue;
}
// the node to expand is found
// remove it from frontier
Vec_PtrRemove( vFront, pPivot );
// add fanins
pFanin = Ivy_ObjFanin0(pPivot);
if ( !pFanin->fMarkA )
{
pFanin->fMarkA = 1;
Vec_PtrPush( vNodes, pFanin );
Vec_PtrPush( vFront, pFanin );
}
pFanin = Ivy_ObjFanin1(pPivot);
if ( pFanin && !pFanin->fMarkA )
{
pFanin->fMarkA = 1;
Vec_PtrPush( vNodes, pFanin );
Vec_PtrPush( vFront, pFanin );
}
// quit if we collected enough nodes
} while ( Vec_PtrSize(vNodes) < nNodeLimit );
// sort nodes by level
Vec_PtrSort( vNodes, Ivy_CompareNodesByLevel );
// make sure the nodes are ordered in the increasing number of levels
pFanin = Vec_PtrEntry( vNodes, 0 );
pPivot = Vec_PtrEntryLast( vNodes );
assert( pFanin->Level <= pPivot->Level );
// clean the marks and remember node numbers in the TravId
Vec_PtrForEachEntry( vNodes, pFanin, i )
{
pFanin->fMarkA = 0;
pFanin->TravId = i;
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Extra_TruthOrWords( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nWords )
{
int w;
for ( w = nWords-1; w >= 0; w-- )
pOut[w] = pIn0[w] | pIn1[w];
}
static inline int Extra_TruthIsImplyWords( unsigned * pIn1, unsigned * pIn2, int nWords )
{
int w;
for ( w = nWords-1; w >= 0; w-- )
if ( pIn1[w] & ~pIn2[w] )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Merges two sets of bit-cuts at a node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeFindCutsMerge( Vec_Ptr_t * vCuts0, Vec_Ptr_t * vCuts1, Vec_Ptr_t * vCuts,
int nLeaves, int nWords, Vec_Int_t * vStore )
{
unsigned * pBitCut, * pBitCut0, * pBitCut1, * pBitCutTest;
int i, k, c, w, Counter;
// iterate through the cut pairs
Vec_PtrForEachEntry( vCuts0, pBitCut0, i )
Vec_PtrForEachEntry( vCuts1, pBitCut1, k )
{
// skip infeasible cuts
Counter = 0;
for ( w = 0; w < nWords; w++ )
{
Counter += Extra_WordCountOnes( pBitCut0[w] | pBitCut1[w] );
if ( Counter > nLeaves )
break;
}
if ( Counter > nLeaves )
continue;
// the new cut is feasible - create it
pBitCutTest = Vec_IntFetch( vStore, nWords );
Extra_TruthOrWords( pBitCutTest, pBitCut0, pBitCut1, nWords );
// filter contained cuts; try to find containing cut
w = 0;
Vec_PtrForEachEntry( vCuts, pBitCut, c )
{
if ( Extra_TruthIsImplyWords( pBitCut, pBitCutTest, nWords ) )
break;
if ( Extra_TruthIsImplyWords( pBitCutTest, pBitCut, nWords ) )
continue;
Vec_PtrWriteEntry( vCuts, w++, pBitCut );
}
if ( c != Vec_PtrSize(vCuts) )
continue;
Vec_PtrShrink( vCuts, w );
// add the cut
Vec_PtrPush( vCuts, pBitCutTest );
}
}
/**Function*************************************************************
Synopsis [Compute the set of all cuts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ManTestCutsTravAll( Ivy_Man_t * p )
{
Ivy_Store_t * pStore;
Ivy_Obj_t * pObj;
Vec_Ptr_t * vNodes, * vFront;
Vec_Int_t * vStore;
Vec_Vec_t * vBitCuts;
int i, nCutsCut, nCutsTotal, nNodeTotal, nNodeOver;
int clk = clock();
vNodes = Vec_PtrAlloc( 100 );
vFront = Vec_PtrAlloc( 100 );
vStore = Vec_IntAlloc( 100 );
vBitCuts = Vec_VecAlloc( 100 );
nNodeTotal = nNodeOver = 0;
nCutsTotal = -Ivy_ManNodeNum(p);
Ivy_ManForEachObj( p, pObj, i )
{
if ( !Ivy_ObjIsNode(pObj) )
continue;
pStore = Ivy_NodeFindCutsTravAll( p, pObj, 4, 60, vNodes, vFront, vStore, vBitCuts );
nCutsCut = pStore->nCuts;
nCutsTotal += nCutsCut;
nNodeOver += (nCutsCut == IVY_CUT_LIMIT);
nNodeTotal++;
}
printf( "Total cuts = %6d. Trivial = %6d. Nodes = %6d. Satur = %6d. ",
nCutsTotal, Ivy_ManPiNum(p) + Ivy_ManNodeNum(p), nNodeTotal, nNodeOver );
PRT( "Time", clock() - clk );
Vec_PtrFree( vNodes );
Vec_PtrFree( vFront );
Vec_IntFree( vStore );
Vec_VecFree( vBitCuts );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
