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abc/src/base/abci/abcNtbdd.c

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/**CFile****************************************************************
FileName [abcNtbdd.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Procedures to translate between the BDD and the network.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcNtbdd.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Abc_NtkBddToMuxesPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew );
static Abc_Obj_t * Abc_NodeBddToMuxes( Abc_Obj_t * pNodeOld, Abc_Ntk_t * pNtkNew );
static Abc_Obj_t * Abc_NodeBddToMuxes_rec( DdManager * dd, DdNode * bFunc, Abc_Ntk_t * pNtkNew, st_table * tBdd2Node );
static DdNode * Abc_NodeGlobalBdds_rec( DdManager * dd, Abc_Obj_t * pNode );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Constructs the network isomorphic to the given BDD.]
Description [Assumes that the BDD depends on the variables whose indexes
correspond to the names in the array (pNamesPi). Otherwise, returns NULL.
The resulting network comes with one node, whose functionality is
equal to the given BDD. To decompose this BDD into the network of
multiplexers use Abc_NtkBddToMuxes(). To decompose this BDD into
an And-Inverter Graph, use Abc_NtkStrash().]
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkDeriveFromBdd( DdManager * dd, DdNode * bFunc, char * pNamePo, Vec_Ptr_t * vNamesPi )
{
Abc_Ntk_t * pNtk;
Vec_Ptr_t * vNamesPiFake = NULL;
Abc_Obj_t * pNode, * pNodePi, * pNodePo;
DdNode * bSupp, * bTemp;
char * pName;
int i;
// supply fake names if real names are not given
if ( pNamePo == NULL )
pNamePo = "F";
if ( vNamesPi == NULL )
{
vNamesPiFake = Abc_NodeGetFakeNames( dd->size );
vNamesPi = vNamesPiFake;
}
// make sure BDD depends on the variables whose index
// does not exceed the size of the array with PI names
bSupp = Cudd_Support( dd, bFunc ); Cudd_Ref( bSupp );
for ( bTemp = bSupp; bTemp != Cudd_ReadOne(dd); bTemp = cuddT(bTemp) )
if ( (int)Cudd_NodeReadIndex(bTemp) >= Vec_PtrSize(vNamesPi) )
break;
Cudd_RecursiveDeref( dd, bSupp );
if ( bTemp != Cudd_ReadOne(dd) )
return NULL;
// start the network
pNtk = Abc_NtkAlloc( ABC_NTK_LOGIC, ABC_FUNC_BDD );
pNtk->pName = util_strsav(pNamePo);
// make sure the new manager has enough inputs
Cudd_bddIthVar( pNtk->pManFunc, Vec_PtrSize(vNamesPi) );
// add the PIs corresponding to the names
Vec_PtrForEachEntry( vNamesPi, pName, i )
Abc_NtkLogicStoreName( Abc_NtkCreatePi(pNtk), pName );
// create the node
pNode = Abc_NtkCreateNode( pNtk );
pNode->pData = Cudd_bddTransfer( dd, pNtk->pManFunc, bFunc ); Cudd_Ref(pNode->pData);
Abc_NtkForEachPi( pNtk, pNodePi, i )
Abc_ObjAddFanin( pNode, pNodePi );
// create the only PO
pNodePo = Abc_NtkCreatePo( pNtk );
Abc_ObjAddFanin( pNodePo, pNode );
Abc_NtkLogicStoreName( pNodePo, pNamePo );
// make the network minimum base
Abc_NtkMinimumBase( pNtk );
if ( vNamesPiFake )
Abc_NodeFreeNames( vNamesPiFake );
if ( !Abc_NtkCheck( pNtk ) )
fprintf( stdout, "Abc_NtkDeriveFromBdd(): Network check has failed.\n" );
return pNtk;
}
/**Function*************************************************************
Synopsis [Creates the network isomorphic to the union of local BDDs of the nodes.]
Description [The nodes of the local BDDs are converted into the network nodes
with logic functions equal to the MUX.]
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkBddToMuxes( Abc_Ntk_t * pNtk )
{
Abc_Ntk_t * pNtkNew;
assert( Abc_NtkIsBddLogic(pNtk) );
pNtkNew = Abc_NtkStartFrom( pNtk, ABC_NTK_LOGIC, ABC_FUNC_SOP );
Abc_NtkBddToMuxesPerform( pNtk, pNtkNew );
Abc_NtkFinalize( pNtk, pNtkNew );
// make sure everything is okay
if ( !Abc_NtkCheck( pNtkNew ) )
{
printf( "Abc_NtkBddToMuxes: The network check has failed.\n" );
Abc_NtkDelete( pNtkNew );
return NULL;
}
return pNtkNew;
}
/**Function*************************************************************
Synopsis [Converts the network to MUXes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkBddToMuxesPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew )
{
ProgressBar * pProgress;
DdManager * dd = pNtk->pManFunc;
Abc_Obj_t * pNode, * pNodeNew;
Vec_Ptr_t * vNodes;
int i;
// perform conversion in the topological order
vNodes = Abc_NtkDfs( pNtk, 0 );
pProgress = Extra_ProgressBarStart( stdout, vNodes->nSize );
Vec_PtrForEachEntry( vNodes, pNode, i )
{
Extra_ProgressBarUpdate( pProgress, i, NULL );
// convert one node
assert( Abc_ObjIsNode(pNode) );
pNodeNew = Abc_NodeBddToMuxes( pNode, pNtkNew );
// mark the old node with the new one
assert( pNode->pCopy == NULL );
pNode->pCopy = pNodeNew;
}
Vec_PtrFree( vNodes );
Extra_ProgressBarStop( pProgress );
}
/**Function*************************************************************
Synopsis [Converts the node to MUXes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_NodeBddToMuxes( Abc_Obj_t * pNodeOld, Abc_Ntk_t * pNtkNew )
{
DdManager * dd = pNodeOld->pNtk->pManFunc;
DdNode * bFunc = pNodeOld->pData;
Abc_Obj_t * pFaninOld, * pNodeNew;
st_table * tBdd2Node;
int i;
// create the table mapping BDD nodes into the ABC nodes
tBdd2Node = st_init_table( st_ptrcmp, st_ptrhash );
// add the constant and the elementary vars
st_insert( tBdd2Node, (char *)b1, (char *)Abc_NtkConst1(pNtkNew) );
Abc_ObjForEachFanin( pNodeOld, pFaninOld, i )
st_insert( tBdd2Node, (char *)Cudd_bddIthVar(dd, i), (char *)pFaninOld->pCopy );
// create the new nodes recursively
pNodeNew = Abc_NodeBddToMuxes_rec( dd, Cudd_Regular(bFunc), pNtkNew, tBdd2Node );
st_free_table( tBdd2Node );
if ( Cudd_IsComplement(bFunc) )
pNodeNew = Abc_NodeCreateInv( pNtkNew, pNodeNew );
return pNodeNew;
}
/**Function*************************************************************
Synopsis [Converts the node to MUXes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Obj_t * Abc_NodeBddToMuxes_rec( DdManager * dd, DdNode * bFunc, Abc_Ntk_t * pNtkNew, st_table * tBdd2Node )
{
Abc_Obj_t * pNodeNew, * pNodeNew0, * pNodeNew1, * pNodeNewC;
assert( !Cudd_IsComplement(bFunc) );
if ( st_lookup( tBdd2Node, (char *)bFunc, (char **)&pNodeNew ) )
return pNodeNew;
// solve for the children nodes
pNodeNew0 = Abc_NodeBddToMuxes_rec( dd, Cudd_Regular(cuddE(bFunc)), pNtkNew, tBdd2Node );
if ( Cudd_IsComplement(cuddE(bFunc)) )
pNodeNew0 = Abc_NodeCreateInv( pNtkNew, pNodeNew0 );
pNodeNew1 = Abc_NodeBddToMuxes_rec( dd, cuddT(bFunc), pNtkNew, tBdd2Node );
if ( !st_lookup( tBdd2Node, (char *)Cudd_bddIthVar(dd, bFunc->index), (char **)&pNodeNewC ) )
assert( 0 );
// create the MUX node
pNodeNew = Abc_NodeCreateMux( pNtkNew, pNodeNewC, pNodeNew1, pNodeNew0 );
st_insert( tBdd2Node, (char *)bFunc, (char *)pNodeNew );
return pNodeNew;
}
/**Function*************************************************************
Synopsis [Derives global BDDs for the COs of the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
DdManager * Abc_NtkGlobalBdds( Abc_Ntk_t * pNtk, int fLatchOnly )
{
int fReorder = 1;
ProgressBar * pProgress;
Vec_Ptr_t * vFuncsGlob;
Abc_Obj_t * pNode;
DdNode * bFunc;
DdManager * dd;
int i;
// start the manager
assert( pNtk->pManGlob == NULL );
dd = Cudd_Init( Abc_NtkCiNum(pNtk), 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
if ( fReorder )
Cudd_AutodynEnable( dd, CUDD_REORDER_SYMM_SIFT );
// set the elementary variables
Abc_NtkCleanCopy( pNtk );
Abc_NtkForEachCi( pNtk, pNode, i )
pNode->pCopy = (Abc_Obj_t *)dd->vars[i];
// assign the constant node BDD
pNode = Abc_NtkConst1( pNtk );
pNode->pCopy = (Abc_Obj_t *)dd->one; Cudd_Ref( dd->one );
// collect the global functions of the COs
vFuncsGlob = Vec_PtrAlloc( 100 );
if ( fLatchOnly )
{
// construct the BDDs
pProgress = Extra_ProgressBarStart( stdout, Abc_NtkLatchNum(pNtk) );
Abc_NtkForEachLatch( pNtk, pNode, i )
{
Extra_ProgressBarUpdate( pProgress, i, NULL );
bFunc = Abc_NodeGlobalBdds_rec( dd, Abc_ObjFanin0(pNode) );
if ( bFunc == NULL )
{
printf( "Constructing global BDDs timed out.\n" );
Extra_ProgressBarStop( pProgress );
Cudd_Quit( dd );
return NULL;
}
bFunc = Cudd_NotCond( bFunc, Abc_ObjFaninC0(pNode) ); Cudd_Ref( bFunc );
Vec_PtrPush( vFuncsGlob, bFunc );
}
Extra_ProgressBarStop( pProgress );
}
else
{
// construct the BDDs
pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
Abc_NtkForEachCo( pNtk, pNode, i )
{
Extra_ProgressBarUpdate( pProgress, i, NULL );
bFunc = Abc_NodeGlobalBdds_rec( dd, Abc_ObjFanin0(pNode) );
if ( bFunc == NULL )
{
printf( "Constructing global BDDs timed out.\n" );
Extra_ProgressBarStop( pProgress );
Cudd_Quit( dd );
return NULL;
}
bFunc = Cudd_NotCond( bFunc, Abc_ObjFaninC0(pNode) ); Cudd_Ref( bFunc );
Vec_PtrPush( vFuncsGlob, bFunc );
}
Extra_ProgressBarStop( pProgress );
}
// derefence the intermediate BDDs
Abc_NtkForEachNode( pNtk, pNode, i )
if ( pNode->pCopy )
{
Cudd_RecursiveDeref( dd, (DdNode *)pNode->pCopy );
pNode->pCopy = NULL;
}
// reorder one more time
if ( fReorder )
{
Cudd_ReduceHeap( dd, CUDD_REORDER_SYMM_SIFT, 1 );
Cudd_AutodynDisable( dd );
}
pNtk->pManGlob = dd;
pNtk->vFuncsGlob = vFuncsGlob;
return dd;
}
/**Function*************************************************************
Synopsis [Derives the global BDD for one AIG node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
DdNode * Abc_NodeGlobalBdds_rec( DdManager * dd, Abc_Obj_t * pNode )
{
DdNode * bFunc, * bFunc0, * bFunc1;
assert( !Abc_ObjIsComplement(pNode) );
if ( Cudd_ReadKeys(dd) > 500000 )
return NULL;
// if the result is available return
if ( pNode->pCopy )
return (DdNode *)pNode->pCopy;
// compute the result for both branches
bFunc0 = Abc_NodeGlobalBdds_rec( dd, Abc_ObjFanin(pNode,0) );
if ( bFunc0 == NULL )
return NULL;
Cudd_Ref( bFunc0 );
bFunc1 = Abc_NodeGlobalBdds_rec( dd, Abc_ObjFanin(pNode,1) );
if ( bFunc1 == NULL )
return NULL;
Cudd_Ref( bFunc1 );
bFunc0 = Cudd_NotCond( bFunc0, Abc_ObjFaninC0(pNode) );
bFunc1 = Cudd_NotCond( bFunc1, Abc_ObjFaninC1(pNode) );
// get the final result
bFunc = Cudd_bddAnd( dd, bFunc0, bFunc1 ); Cudd_Ref( bFunc );
Cudd_RecursiveDeref( dd, bFunc0 );
Cudd_RecursiveDeref( dd, bFunc1 );
// set the result
assert( pNode->pCopy == NULL );
pNode->pCopy = (Abc_Obj_t *)bFunc;
return bFunc;
}
/**Function*************************************************************
Synopsis [Dereferences global BDDs of the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkFreeGlobalBdds( Abc_Ntk_t * pNtk )
{
DdNode * bFunc;
int i;
assert( pNtk->pManGlob );
assert( pNtk->vFuncsGlob );
Vec_PtrForEachEntry( pNtk->vFuncsGlob, bFunc, i )
Cudd_RecursiveDeref( pNtk->pManGlob, bFunc );
Vec_PtrFree( pNtk->vFuncsGlob );
pNtk->vFuncsGlob = NULL;
}
/**Function*************************************************************
Synopsis [Computes the BDD of the logic cone of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
double Abc_NtkSpacePercentage( Abc_Obj_t * pNode )
{
Vec_Ptr_t * vNodes;
Abc_Obj_t * pObj, * pNodeR;
DdManager * dd;
DdNode * bFunc;
double Result;
int i;
pNodeR = Abc_ObjRegular(pNode);
assert( Abc_NtkIsStrash(pNodeR->pNtk) );
Abc_NtkCleanCopy( pNodeR->pNtk );
// get the CIs in the support of the node
vNodes = Abc_NtkNodeSupport( pNodeR->pNtk, &pNodeR, 1 );
// start the manager
dd = Cudd_Init( Vec_PtrSize(vNodes), 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
Cudd_AutodynEnable( dd, CUDD_REORDER_SYMM_SIFT );
// assign elementary BDDs for the CIs
Vec_PtrForEachEntry( vNodes, pObj, i )
pObj->pCopy = (Abc_Obj_t *)dd->vars[i];
// build the BDD of the cone
bFunc = Abc_NodeGlobalBdds_rec( dd, pNodeR ); Cudd_Ref( bFunc );
bFunc = Cudd_NotCond( bFunc, pNode != pNodeR );
// count minterms
Result = Cudd_CountMinterm( dd, bFunc, dd->size );
// get the percentagle
Result *= 100.0;
for ( i = 0; i < dd->size; i++ )
Result /= 2;
// clean up
Cudd_Quit( dd );
Vec_PtrFree( vNodes );
return Result;
}
#include "reo.h"
/**Function*************************************************************
Synopsis [Reorders BDD of the local function of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NodeBddReorder( reo_man * p, Abc_Obj_t * pNode )
{
Abc_Obj_t * pFanin;
DdNode * bFunc;
int * pOrder, i;
// create the temporary array for the variable order
pOrder = ALLOC( int, Abc_ObjFaninNum(pNode) );
for ( i = 0; i < Abc_ObjFaninNum(pNode); i++ )
pOrder[i] = -1;
// reorder the BDD
bFunc = Extra_Reorder( p, pNode->pNtk->pManFunc, pNode->pData, pOrder ); Cudd_Ref( bFunc );
Cudd_RecursiveDeref( pNode->pNtk->pManFunc, pNode->pData );
pNode->pData = bFunc;
// update the fanin order
Abc_ObjForEachFanin( pNode, pFanin, i )
pOrder[i] = pNode->vFanins.pArray[ pOrder[i] ];
Abc_ObjForEachFanin( pNode, pFanin, i )
pNode->vFanins.pArray[i] = pOrder[i];
free( pOrder );
}
/**Function*************************************************************
Synopsis [Reorders BDDs of the local functions.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkBddReorder( Abc_Ntk_t * pNtk, int fVerbose )
{
reo_man * p;
Abc_Obj_t * pNode;
int i;
p = Extra_ReorderInit( Abc_NtkGetFaninMax(pNtk), 100 );
Abc_NtkForEachNode( pNtk, pNode, i )
{
if ( Abc_ObjFaninNum(pNode) < 3 )
continue;
if ( fVerbose )
fprintf( stdout, "%10s: ", Abc_ObjName(pNode) );
if ( fVerbose )
fprintf( stdout, "Before = %5d BDD nodes. ", Cudd_DagSize(pNode->pData) );
Abc_NodeBddReorder( p, pNode );
if ( fVerbose )
fprintf( stdout, "After = %5d BDD nodes.\n", Cudd_DagSize(pNode->pData) );
}
Extra_ReorderQuit( p );
}
/**Function*************************************************************
Synopsis [Experiment with BDD-based representation of implications.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkBddImplicationTest()
{
DdManager * dd;
DdNode * bImp, * bSum, * bTemp;
int nVars = 200;
int nImps = 200;
int i, clk;
clk = clock();
dd = Cudd_Init( nVars, 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
Cudd_AutodynEnable( dd, CUDD_REORDER_SIFT );
bSum = b0; Cudd_Ref( bSum );
for ( i = 0; i < nImps; i++ )
{
printf( "." );
bImp = Cudd_bddAnd( dd, dd->vars[rand()%nVars], dd->vars[rand()%nVars] ); Cudd_Ref( bImp );
bSum = Cudd_bddOr( dd, bTemp = bSum, bImp ); Cudd_Ref( bSum );
Cudd_RecursiveDeref( dd, bTemp );
Cudd_RecursiveDeref( dd, bImp );
}
printf( "The BDD before = %d.\n", Cudd_DagSize(bSum) );
Cudd_ReduceHeap( dd, CUDD_REORDER_SIFT, 1 );
printf( "The BDD after = %d.\n", Cudd_DagSize(bSum) );
PRT( "Time", clock() - clk );
Cudd_RecursiveDeref( dd, bSum );
Cudd_Quit( dd );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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