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/**CFile****************************************************************
FileName [cutOracle.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [K-feasible cut computation package.]
Synopsis [Procedures to compute cuts for a node using the oracle.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: cutOracle.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cutInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
struct Cut_OracleStruct_t_
{
// cut comptupatation parameters
Cut_Params_t * pParams;
Vec_Int_t * vFanCounts;
int fSimul;
// storage for cuts
Vec_Ptr_t * vCutsNew;
Vec_Ptr_t * vCuts0;
Vec_Ptr_t * vCuts1;
// oracle info
Vec_Int_t * vNodeCuts;
Vec_Int_t * vNodeStarts;
Vec_Int_t * vCutPairs;
// memory management
Extra_MmFixed_t * pMmCuts;
int EntrySize;
int nTruthWords;
// stats
int timeTotal;
int nCuts;
int nCutsTriv;
};
static Cut_Cut_t * Cut_CutStart( Cut_Oracle_t * p );
static Cut_Cut_t * Cut_CutTriv( Cut_Oracle_t * p, int Node );
static Cut_Cut_t * Cut_CutMerge( Cut_Oracle_t * p, Cut_Cut_t * pCut0, Cut_Cut_t * pCut1 );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the cut oracle.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Oracle_t * Cut_OracleStart( Cut_Man_t * pMan )
{
Cut_Oracle_t * p;
assert( pMan->pParams->nVarsMax >= 3 && pMan->pParams->nVarsMax <= CUT_SIZE_MAX );
assert( pMan->pParams->fRecord );
p = ABC_ALLOC( Cut_Oracle_t, 1 );
memset( p, 0, sizeof(Cut_Oracle_t) );
// set and correct parameters
p->pParams = pMan->pParams;
// transfer the recording info
p->vNodeCuts = pMan->vNodeCuts; pMan->vNodeCuts = NULL;
p->vNodeStarts = pMan->vNodeStarts; pMan->vNodeStarts = NULL;
p->vCutPairs = pMan->vCutPairs; pMan->vCutPairs = NULL;
// prepare storage for cuts
p->vCutsNew = Vec_PtrAlloc( p->pParams->nIdsMax );
Vec_PtrFill( p->vCutsNew, p->pParams->nIdsMax, NULL );
p->vCuts0 = Vec_PtrAlloc( 100 );
p->vCuts1 = Vec_PtrAlloc( 100 );
// entry size
p->EntrySize = sizeof(Cut_Cut_t) + p->pParams->nVarsMax * sizeof(int);
if ( p->pParams->fTruth )
{
if ( p->pParams->nVarsMax > 8 )
{
p->pParams->fTruth = 0;
printf( "Skipping computation of truth table for more than 8 inputs.\n" );
}
else
{
p->nTruthWords = Cut_TruthWords( p->pParams->nVarsMax );
p->EntrySize += p->nTruthWords * sizeof(unsigned);
}
}
// memory for cuts
p->pMmCuts = Extra_MmFixedStart( p->EntrySize );
return p;
}
/**Function*************************************************************
Synopsis [Stop the cut oracle.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_OracleStop( Cut_Oracle_t * p )
{
// if ( p->pParams->fVerbose )
{
printf( "Cut computation statistics with oracle:\n" );
printf( "Current cuts = %8d. (Trivial = %d.)\n", p->nCuts-p->nCutsTriv, p->nCutsTriv );
ABC_PRT( "Total time ", p->timeTotal );
}
if ( p->vCuts0 ) Vec_PtrFree( p->vCuts0 );
if ( p->vCuts1 ) Vec_PtrFree( p->vCuts1 );
if ( p->vCutsNew ) Vec_PtrFree( p->vCutsNew );
if ( p->vFanCounts ) Vec_IntFree( p->vFanCounts );
if ( p->vNodeCuts ) Vec_IntFree( p->vNodeCuts );
if ( p->vNodeStarts ) Vec_IntFree( p->vNodeStarts );
if ( p->vCutPairs ) Vec_IntFree( p->vCutPairs );
Extra_MmFixedStop( p->pMmCuts );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_OracleSetFanoutCounts( Cut_Oracle_t * p, Vec_Int_t * vFanCounts )
{
p->vFanCounts = vFanCounts;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cut_OracleReadDrop( Cut_Oracle_t * p )
{
return p->pParams->fDrop;
}
/**Function*************************************************************
Synopsis [Sets the trivial cut for the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_OracleNodeSetTriv( Cut_Oracle_t * p, int Node )
{
assert( Vec_PtrEntry( p->vCutsNew, Node ) == NULL );
Vec_PtrWriteEntry( p->vCutsNew, Node, Cut_CutTriv(p, Node) );
}
/**Function*************************************************************
Synopsis [Allocates the cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Cut_t * Cut_CutStart( Cut_Oracle_t * p )
{
Cut_Cut_t * pCut;
// cut allocation
pCut = (Cut_Cut_t *)Extra_MmFixedEntryFetch( p->pMmCuts );
memset( pCut, 0, sizeof(Cut_Cut_t) );
pCut->nVarsMax = p->pParams->nVarsMax;
pCut->fSimul = p->fSimul;
p->nCuts++;
return pCut;
}
/**Function*************************************************************
Synopsis [Creates the trivial cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Cut_t * Cut_CutTriv( Cut_Oracle_t * p, int Node )
{
Cut_Cut_t * pCut;
pCut = Cut_CutStart( p );
pCut->nLeaves = 1;
pCut->pLeaves[0] = Node;
if ( p->pParams->fTruth )
{
unsigned * pTruth = Cut_CutReadTruth(pCut);
int i;
for ( i = 0; i < p->nTruthWords; i++ )
pTruth[i] = 0xAAAAAAAA;
}
p->nCutsTriv++;
return pCut;
}
/**Function*************************************************************
Synopsis [Merges two cuts.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Cut_t * Cut_CutMerge( Cut_Oracle_t * p, Cut_Cut_t * pCut0, Cut_Cut_t * pCut1 )
{
Cut_Cut_t * pCut;
int Limit, i, k, c;
// create the leaves of the new cut
pCut = Cut_CutStart( p );
Limit = p->pParams->nVarsMax;
for ( i = k = c = 0; c < Limit; c++ )
{
if ( k == (int)pCut1->nLeaves )
{
if ( i == (int)pCut0->nLeaves )
{
pCut->nLeaves = c;
return pCut;
}
pCut->pLeaves[c] = pCut0->pLeaves[i++];
continue;
}
if ( i == (int)pCut0->nLeaves )
{
if ( k == (int)pCut1->nLeaves )
{
pCut->nLeaves = c;
return pCut;
}
pCut->pLeaves[c] = pCut1->pLeaves[k++];
continue;
}
if ( pCut0->pLeaves[i] < pCut1->pLeaves[k] )
{
pCut->pLeaves[c] = pCut0->pLeaves[i++];
continue;
}
if ( pCut0->pLeaves[i] > pCut1->pLeaves[k] )
{
pCut->pLeaves[c] = pCut1->pLeaves[k++];
continue;
}
pCut->pLeaves[c] = pCut0->pLeaves[i++];
k++;
}
assert( i == (int)pCut0->nLeaves && k == (int)pCut1->nLeaves );
pCut->nLeaves = c;
return pCut;
}
/**Function*************************************************************
Synopsis [Reconstruct the cuts of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Cut_t * Cut_OracleComputeCuts( Cut_Oracle_t * p, int Node, int Node0, int Node1, int fCompl0, int fCompl1 )
{
Cut_Cut_t * pList = NULL, ** ppTail = &pList;
Cut_Cut_t * pCut, * pCut0, * pCut1, * pList0, * pList1;
int iCutStart, nCuts, i, Entry;
int clk = clock();
// get the cuts of the children
pList0 = (Cut_Cut_t *)Vec_PtrEntry( p->vCutsNew, Node0 );
pList1 = (Cut_Cut_t *)Vec_PtrEntry( p->vCutsNew, Node1 );
assert( pList0 && pList1 );
// get the complemented attribute of the cut
p->fSimul = (fCompl0 ^ pList0->fSimul) & (fCompl1 ^ pList1->fSimul);
// collect the cuts
Vec_PtrClear( p->vCuts0 );
Cut_ListForEachCut( pList0, pCut )
Vec_PtrPush( p->vCuts0, pCut );
Vec_PtrClear( p->vCuts1 );
Cut_ListForEachCut( pList1, pCut )
Vec_PtrPush( p->vCuts1, pCut );
// get the first and last cuts of this node
nCuts = Vec_IntEntry(p->vNodeCuts, Node);
iCutStart = Vec_IntEntry(p->vNodeStarts, Node);
// create trivial cut
assert( Vec_IntEntry(p->vCutPairs, iCutStart) == 0 );
pCut = Cut_CutTriv( p, Node );
*ppTail = pCut;
ppTail = &pCut->pNext;
// create other cuts
for ( i = 1; i < nCuts; i++ )
{
Entry = Vec_IntEntry( p->vCutPairs, iCutStart + i );
pCut0 = (Cut_Cut_t *)Vec_PtrEntry( p->vCuts0, Entry & 0xFFFF );
pCut1 = (Cut_Cut_t *)Vec_PtrEntry( p->vCuts1, Entry >> 16 );
pCut = Cut_CutMerge( p, pCut0, pCut1 );
*ppTail = pCut;
ppTail = &pCut->pNext;
// compute the truth table
if ( p->pParams->fTruth )
Cut_TruthComputeOld( pCut, pCut0, pCut1, fCompl0, fCompl1 );
}
*ppTail = NULL;
// write the new cut
assert( Vec_PtrEntry( p->vCutsNew, Node ) == NULL );
Vec_PtrWriteEntry( p->vCutsNew, Node, pList );
p->timeTotal += clock() - clk;
return pList;
}
/**Function*************************************************************
Synopsis [Deallocates the cuts at the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_OracleFreeCuts( Cut_Oracle_t * p, int Node )
{
Cut_Cut_t * pList, * pCut, * pCut2;
pList = (Cut_Cut_t *)Vec_PtrEntry( p->vCutsNew, Node );
if ( pList == NULL )
return;
Cut_ListForEachCutSafe( pList, pCut, pCut2 )
Extra_MmFixedEntryRecycle( p->pMmCuts, (char *)pCut );
Vec_PtrWriteEntry( p->vCutsNew, Node, pList );
}
/**Function*************************************************************
Synopsis [Consider dropping cuts if they are useless by now.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cut_OracleTryDroppingCuts( Cut_Oracle_t * p, int Node )
{
int nFanouts;
assert( p->vFanCounts );
nFanouts = Vec_IntEntry( p->vFanCounts, Node );
assert( nFanouts > 0 );
if ( --nFanouts == 0 )
Cut_OracleFreeCuts( p, Node );
Vec_IntWriteEntry( p->vFanCounts, Node, nFanouts );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
