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abc/src/map/if/ifCut.c

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/**CFile****************************************************************
FileName [ifCut.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [FPGA mapping based on priority cuts.]
Synopsis [Cut computation.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - November 21, 2006.]
Revision [$Id: ifCut.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]
***********************************************************************/
#include "if.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns 1 if pDom is contained in pCut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int If_CutCheckDominance( If_Cut_t * pDom, If_Cut_t * pCut )
{
int i, k;
for ( i = 0; i < (int)pDom->nLeaves; i++ )
{
for ( k = 0; k < (int)pCut->nLeaves; k++ )
if ( pDom->pLeaves[i] == pCut->pLeaves[k] )
break;
if ( k == (int)pCut->nLeaves ) // node i in pDom is not contained in pCut
return 0;
}
// every node in pDom is contained in pCut
return 1;
}
/**Function*************************************************************
Synopsis [Returns 1 if pDom is equal to pCut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int If_CutCheckEquality( If_Cut_t * pDom, If_Cut_t * pCut )
{
int i;
if ( (int)pDom->nLeaves != (int)pCut->nLeaves )
return 0;
for ( i = 0; i < (int)pDom->nLeaves; i++ )
if ( pDom->pLeaves[i] != pCut->pLeaves[i] )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Returns 1 if the cut is contained.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_CutFilter( If_Man_t * p, If_Cut_t * pCut )
{
If_Cut_t * pTemp;
int i;
for ( i = 0; i < p->nCuts; i++ )
{
pTemp = p->ppCuts[i];
if ( pTemp->nLeaves > pCut->nLeaves )
{
// do not fiter the first cut
if ( i == 0 )
continue;
// skip the non-contained cuts
if ( (pTemp->uSign & pCut->uSign) != pCut->uSign )
continue;
// check containment seriously
if ( If_CutCheckDominance( pCut, pTemp ) )
{
// removed contained cut
p->ppCuts[i] = p->ppCuts[p->nCuts-1];
p->ppCuts[p->nCuts-1] = pTemp;
p->nCuts--;
i--;
}
}
else
{
// skip the non-contained cuts
if ( (pTemp->uSign & pCut->uSign) != pTemp->uSign )
continue;
// check containment seriously
if ( If_CutCheckDominance( pTemp, pCut ) )
return 1;
}
}
return 0;
}
/**Function*************************************************************
Synopsis [Merges two cuts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int If_CutMergeOrdered( If_Cut_t * pC0, If_Cut_t * pC1, If_Cut_t * pC )
{
int i, k, c;
assert( pC0->nLeaves >= pC1->nLeaves );
// the case of the largest cut sizes
if ( pC0->nLeaves == pC->nLimit && pC1->nLeaves == pC->nLimit )
{
for ( i = 0; i < (int)pC0->nLeaves; i++ )
if ( pC0->pLeaves[i] != pC1->pLeaves[i] )
return 0;
for ( i = 0; i < (int)pC0->nLeaves; i++ )
pC->pLeaves[i] = pC0->pLeaves[i];
pC->nLeaves = pC0->nLeaves;
return 1;
}
// the case when one of the cuts is the largest
if ( pC0->nLeaves == pC->nLimit )
{
for ( i = 0; i < (int)pC1->nLeaves; i++ )
{
for ( k = (int)pC0->nLeaves - 1; k >= 0; k-- )
if ( pC0->pLeaves[k] == pC1->pLeaves[i] )
break;
if ( k == -1 ) // did not find
return 0;
}
for ( i = 0; i < (int)pC0->nLeaves; i++ )
pC->pLeaves[i] = pC0->pLeaves[i];
pC->nLeaves = pC0->nLeaves;
return 1;
}
// compare two cuts with different numbers
i = k = 0;
for ( c = 0; c < (int)pC->nLimit; c++ )
{
if ( k == (int)pC1->nLeaves )
{
if ( i == (int)pC0->nLeaves )
{
pC->nLeaves = c;
return 1;
}
pC->pLeaves[c] = pC0->pLeaves[i++];
continue;
}
if ( i == (int)pC0->nLeaves )
{
if ( k == (int)pC1->nLeaves )
{
pC->nLeaves = c;
return 1;
}
pC->pLeaves[c] = pC1->pLeaves[k++];
continue;
}
if ( pC0->pLeaves[i] < pC1->pLeaves[k] )
{
pC->pLeaves[c] = pC0->pLeaves[i++];
continue;
}
if ( pC0->pLeaves[i] > pC1->pLeaves[k] )
{
pC->pLeaves[c] = pC1->pLeaves[k++];
continue;
}
pC->pLeaves[c] = pC0->pLeaves[i++];
k++;
}
if ( i < (int)pC0->nLeaves || k < (int)pC1->nLeaves )
return 0;
pC->nLeaves = c;
return 1;
}
/**Function*************************************************************
Synopsis [Merges two cuts.]
Description [Special case when the cut is known to exist.]
SideEffects []
SeeAlso []
***********************************************************************/
static inline int If_CutMergeOrdered2( If_Cut_t * pC0, If_Cut_t * pC1, If_Cut_t * pC )
{
int i, k, c;
assert( pC0->nLeaves >= pC1->nLeaves );
// copy the first cut
for ( i = 0; i < (int)pC0->nLeaves; i++ )
pC->pLeaves[i] = pC0->pLeaves[i];
pC->nLeaves = pC0->nLeaves;
// the case when one of the cuts is the largest
if ( pC0->nLeaves == pC->nLimit )
return 1;
// add nodes of the second cut
k = 0;
for ( i = 0; i < (int)pC1->nLeaves; i++ )
{
// find k-th node before which i-th node should be added
for ( ; k < (int)pC->nLeaves; k++ )
if ( pC->pLeaves[k] >= pC1->pLeaves[i] )
break;
// check the case when this should be the last node
if ( k == (int)pC->nLeaves )
{
pC->pLeaves[k++] = pC1->pLeaves[i];
pC->nLeaves++;
continue;
}
// check the case when equal node is found
if ( pC1->pLeaves[i] == pC->pLeaves[k] )
continue;
// add the node
for ( c = (int)pC->nLeaves; c > k; c-- )
pC->pLeaves[c] = pC->pLeaves[c-1];
pC->pLeaves[k++] = pC1->pLeaves[i];
pC->nLeaves++;
}
/*
assert( pC->nLeaves <= pC->nLimit );
for ( i = 1; i < (int)pC->nLeaves; i++ )
assert( pC->pLeaves[i-1] < pC->pLeaves[i] );
*/
return 1;
}
/**Function*************************************************************
Synopsis [Prepares the object for FPGA mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_CutMerge( If_Cut_t * pCut0, If_Cut_t * pCut1, If_Cut_t * pCut )
{
assert( pCut->nLimit > 0 );
// merge the nodes
if ( pCut0->nLeaves < pCut1->nLeaves )
{
if ( !If_CutMergeOrdered( pCut1, pCut0, pCut ) )
return 0;
}
else
{
if ( !If_CutMergeOrdered( pCut0, pCut1, pCut ) )
return 0;
}
return 1;
}
/**Function*************************************************************
Synopsis [Prepares the object for FPGA mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_CutCompareDelay( If_Cut_t ** ppC0, If_Cut_t ** ppC1 )
{
If_Cut_t * pC0 = *ppC0;
If_Cut_t * pC1 = *ppC1;
if ( pC0->Delay < pC1->Delay - 0.0001 )
return -1;
if ( pC0->Delay > pC1->Delay + 0.0001 )
return 1;
if ( pC0->nLeaves < pC1->nLeaves )
return -1;
if ( pC0->nLeaves > pC1->nLeaves )
return 1;
if ( pC0->Area < pC1->Area - 0.0001 )
return -1;
if ( pC0->Area > pC1->Area + 0.0001 )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Prepares the object for FPGA mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_CutCompareDelayOld( If_Cut_t ** ppC0, If_Cut_t ** ppC1 )
{
If_Cut_t * pC0 = *ppC0;
If_Cut_t * pC1 = *ppC1;
if ( pC0->Delay < pC1->Delay - 0.0001 )
return -1;
if ( pC0->Delay > pC1->Delay + 0.0001 )
return 1;
if ( pC0->Area < pC1->Area - 0.0001 )
return -1;
if ( pC0->Area > pC1->Area + 0.0001 )
return 1;
if ( pC0->nLeaves < pC1->nLeaves )
return -1;
if ( pC0->nLeaves > pC1->nLeaves )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Prepares the object for FPGA mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_CutCompareArea( If_Cut_t ** ppC0, If_Cut_t ** ppC1 )
{
If_Cut_t * pC0 = *ppC0;
If_Cut_t * pC1 = *ppC1;
if ( pC0->Area < pC1->Area - 0.0001 )
return -1;
if ( pC0->Area > pC1->Area + 0.0001 )
return 1;
if ( pC0->AveRefs > pC1->AveRefs )
return -1;
if ( pC0->AveRefs < pC1->AveRefs )
return 1;
if ( pC0->nLeaves < pC1->nLeaves )
return -1;
if ( pC0->nLeaves > pC1->nLeaves )
return 1;
if ( pC0->Delay < pC1->Delay - 0.0001 )
return -1;
if ( pC0->Delay > pC1->Delay + 0.0001 )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Sorts the cuts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ManSortCuts( If_Man_t * p, int Mode )
{
// sort the cuts
if ( Mode || p->pPars->fArea ) // area
qsort( p->ppCuts, p->nCuts, sizeof(If_Cut_t *), (int (*)(const void *, const void *))If_CutCompareArea );
else if ( p->pPars->fFancy )
qsort( p->ppCuts, p->nCuts, sizeof(If_Cut_t *), (int (*)(const void *, const void *))If_CutCompareDelayOld );
else
qsort( p->ppCuts, p->nCuts, sizeof(If_Cut_t *), (int (*)(const void *, const void *))If_CutCompareDelay );
}
/**Function*************************************************************
Synopsis [Computes area flow.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutFlow( If_Man_t * p, If_Cut_t * pCut )
{
If_Obj_t * pLeaf;
float Flow;
int i;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
Flow = If_CutLutArea(p, pCut);
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
if ( pLeaf->nRefs == 0 )
Flow += If_ObjCutBest(pLeaf)->Area;
else if ( p->pPars->fSeqMap ) // seq
Flow += If_ObjCutBest(pLeaf)->Area / pLeaf->nRefs;
else
{
assert( pLeaf->EstRefs > p->fEpsilon );
Flow += If_ObjCutBest(pLeaf)->Area / pLeaf->EstRefs;
}
}
return Flow;
}
/**Function*************************************************************
Synopsis [Average number of references of the leaves.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutAverageRefs( If_Man_t * p, If_Cut_t * pCut )
{
If_Obj_t * pLeaf;
int nRefsTotal, i;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
nRefsTotal = 0;
If_CutForEachLeaf( p, pCut, pLeaf, i )
nRefsTotal += pLeaf->nRefs;
return ((float)nRefsTotal)/pCut->nLeaves;
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]
Description [The cut need to be derefed.]
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutDeref( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
If_Obj_t * pLeaf;
float Area;
int i;
Area = If_CutLutArea(p, pCut);
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
assert( pLeaf->nRefs > 0 );
if ( --pLeaf->nRefs > 0 || !If_ObjIsAnd(pLeaf) || nLevels == 1 )
continue;
Area += If_CutDeref( p, If_ObjCutBest(pLeaf), nLevels - 1 );
}
return Area;
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]
Description [The cut need to be derefed.]
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutRef( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
If_Obj_t * pLeaf;
float Area;
int i;
Area = If_CutLutArea(p, pCut);
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
assert( pLeaf->nRefs >= 0 );
if ( pLeaf->nRefs++ > 0 || !If_ObjIsAnd(pLeaf) || nLevels == 1 )
continue;
Area += If_CutRef( p, If_ObjCutBest(pLeaf), nLevels - 1 );
}
return Area;
}
/**Function*************************************************************
Synopsis [Prints one cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_CutPrint( If_Man_t * p, If_Cut_t * pCut )
{
unsigned i;
printf( "{" );
for ( i = 0; i < pCut->nLeaves; i++ )
printf( " %d", pCut->pLeaves[i] );
printf( " }\n" );
}
/**Function*************************************************************
Synopsis [Prints one cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_CutPrintTiming( If_Man_t * p, If_Cut_t * pCut )
{
If_Obj_t * pLeaf;
unsigned i;
printf( "{" );
If_CutForEachLeaf( p, pCut, pLeaf, i )
printf( " %d(%.2f/%.2f)", pLeaf->Id, If_ObjCutBest(pLeaf)->Delay, pLeaf->Required );
printf( " }\n" );
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]
Description [The cut need to be derefed.]
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutAreaDerefed( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
float aResult, aResult2;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
aResult2 = If_CutRef( p, pCut, nLevels );
aResult = If_CutDeref( p, pCut, nLevels );
assert( aResult > aResult2 - p->fEpsilon );
assert( aResult < aResult2 + p->fEpsilon );
return aResult;
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]
Description [The cut need to be derefed.]
SideEffects []
SeeAlso []
***********************************************************************/
float If_CutAreaRefed( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
float aResult, aResult2;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
aResult2 = If_CutDeref( p, pCut, nLevels );
aResult = If_CutRef( p, pCut, nLevels );
assert( aResult > aResult2 - p->fEpsilon );
assert( aResult < aResult2 + p->fEpsilon );
return aResult;
}
/**Function*************************************************************
Synopsis [Moves the cut over the latch.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_CutLift( If_Cut_t * pCut )
{
unsigned i;
for ( i = 0; i < pCut->nLeaves; i++ )
{
assert( (pCut->pLeaves[i] & 255) < 255 );
pCut->pLeaves[i]++;
}
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]
Description [The cut need to be derefed.]
SideEffects []
SeeAlso []
***********************************************************************/
void If_CutCopy( If_Cut_t * pCutDest, If_Cut_t * pCutSrc )
{
int * pLeaves;
char * pPerm;
unsigned * pTruth;
// save old arrays
pLeaves = pCutDest->pLeaves;
pPerm = pCutDest->pPerm;
pTruth = pCutDest->pTruth;
// copy the cut info
*pCutDest = *pCutSrc;
// restore the arrays
pCutDest->pLeaves = pLeaves;
pCutDest->pPerm = pPerm;
pCutDest->pTruth = pTruth;
// copy the array data
memcpy( pCutDest->pLeaves, pCutSrc->pLeaves, sizeof(int) * pCutSrc->nLeaves );
if ( pCutSrc->pPerm )
memcpy( pCutDest->pPerm, pCutSrc->pPerm, sizeof(unsigned) * If_CutPermWords(pCutSrc->nLimit) );
if ( pCutSrc->pTruth )
memcpy( pCutDest->pTruth, pCutSrc->pTruth, sizeof(unsigned) * If_CutTruthWords(pCutSrc->nLimit) );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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