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-rw-r--r--src/sat/fraig/fraigNode.c318
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diff --git a/src/sat/fraig/fraigNode.c b/src/sat/fraig/fraigNode.c
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--- a/src/sat/fraig/fraigNode.c
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-/**CFile****************************************************************
-
- FileName [fraigNode.c]
-
- PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
- Synopsis [Implementation of the FRAIG node.]
-
- Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-
- Affiliation [UC Berkeley]
-
- Date [Ver. 2.0. Started - October 1, 2004]
-
- Revision [$Id: fraigNode.c,v 1.3 2005/07/08 01:01:32 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-/// DECLARATIONS ///
-////////////////////////////////////////////////////////////////////////
-
-// returns the complemented attribute of the node
-#define Fraig_NodeIsSimComplement(p) (Fraig_IsComplement(p)? !(Fraig_Regular(p)->fInv) : (p)->fInv)
-
-////////////////////////////////////////////////////////////////////////
-/// FUNCTION DEFINITIONS ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
- Synopsis [Creates the constant 1 node.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreateConst( Fraig_Man_t * p )
-{
- Fraig_Node_t * pNode;
-
- // create the node
- pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
- memset( pNode, 0, sizeof(Fraig_Node_t) );
-
- // assign the number and add to the array of nodes
- pNode->Num = p->vNodes->nSize;
- Fraig_NodeVecPush( p->vNodes, pNode );
- pNode->NumPi = -1; // this is not a PI, so its number is -1
- pNode->Level = 0; // just like a PI, it has 0 level
- pNode->nRefs = 1; // it is a persistent node, which comes referenced
- pNode->fInv = 1; // the simulation info is complemented
-
- // create the simulation info
- pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
- pNode->puSimD = pNode->puSimR + p->nWordsRand;
- memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand );
- memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );
-
- // count the number of ones in the simulation vector
- pNode->nOnes = p->nWordsRand * sizeof(unsigned) * 8;
-
- // insert it into the hash table
- Fraig_HashTableLookupF0( p, pNode );
- return pNode;
-}
-
-/**Function*************************************************************
-
- Synopsis [Creates a primary input node.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreatePi( Fraig_Man_t * p )
-{
- Fraig_Node_t * pNode, * pNodeRes;
- int i, clk;
-
- // create the node
- pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
- memset( pNode, 0, sizeof(Fraig_Node_t) );
- pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
- pNode->puSimD = pNode->puSimR + p->nWordsRand;
- memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );
-
- // assign the number and add to the array of nodes
- pNode->Num = p->vNodes->nSize;
- Fraig_NodeVecPush( p->vNodes, pNode );
-
- // assign the PI number and add to the array of primary inputs
- pNode->NumPi = p->vInputs->nSize;
- Fraig_NodeVecPush( p->vInputs, pNode );
-
- pNode->Level = 0; // PI has 0 level
- pNode->nRefs = 1; // it is a persistent node, which comes referenced
- pNode->fInv = 0; // the simulation info of the PI is not complemented
-
- // derive the simulation info for the new node
-clk = clock();
- // set the random simulation info for the primary input
- pNode->uHashR = 0;
- for ( i = 0; i < p->nWordsRand; i++ )
- {
- // generate the simulation info
- pNode->puSimR[i] = FRAIG_RANDOM_UNSIGNED;
- // for reasons that take very long to explain, it makes sense to have (0000000...)
- // pattern in the set (this helps if we need to return the counter-examples)
- if ( i == 0 )
- pNode->puSimR[i] <<= 1;
- // compute the hash key
- pNode->uHashR ^= pNode->puSimR[i] * s_FraigPrimes[i];
- }
- // count the number of ones in the simulation vector
- pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );
-
- // set the systematic simulation info for the primary input
- pNode->uHashD = 0;
- for ( i = 0; i < p->iWordStart; i++ )
- {
- // generate the simulation info
- pNode->puSimD[i] = FRAIG_RANDOM_UNSIGNED;
- // compute the hash key
- pNode->uHashD ^= pNode->puSimD[i] * s_FraigPrimes[i];
- }
-p->timeSims += clock() - clk;
-
- // insert it into the hash table
- pNodeRes = Fraig_HashTableLookupF( p, pNode );
- assert( pNodeRes == NULL );
- // add to the runtime of simulation
- return pNode;
-}
-
-/**Function*************************************************************
-
- Synopsis [Creates a new node.]
-
- Description [This procedure should be called to create the constant
- node and the PI nodes first.]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreate( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
- Fraig_Node_t * pNode;
- int clk;
-
- // create the node
- pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
- memset( pNode, 0, sizeof(Fraig_Node_t) );
-
- // assign the children
- pNode->p1 = p1; Fraig_Ref(p1); Fraig_Regular(p1)->nRefs++;
- pNode->p2 = p2; Fraig_Ref(p2); Fraig_Regular(p2)->nRefs++;
-
- // assign the number and add to the array of nodes
- pNode->Num = p->vNodes->nSize;
- Fraig_NodeVecPush( p->vNodes, pNode );
-
- // assign the PI number
- pNode->NumPi = -1;
-
- // compute the level of this node
- pNode->Level = 1 + ABC_MAX(Fraig_Regular(p1)->Level, Fraig_Regular(p2)->Level);
- pNode->fInv = Fraig_NodeIsSimComplement(p1) & Fraig_NodeIsSimComplement(p2);
- pNode->fFailTfo = Fraig_Regular(p1)->fFailTfo | Fraig_Regular(p2)->fFailTfo;
-
- // derive the simulation info
-clk = clock();
- // allocate memory for the simulation info
- pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
- pNode->puSimD = pNode->puSimR + p->nWordsRand;
- // derive random simulation info
- pNode->uHashR = 0;
- Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 );
- // derive dynamic simulation info
- pNode->uHashD = 0;
- Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 );
- // count the number of ones in the random simulation info
- pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );
- if ( pNode->fInv )
- pNode->nOnes = p->nWordsRand * 32 - pNode->nOnes;
- // add to the runtime of simulation
-p->timeSims += clock() - clk;
-
-#ifdef FRAIG_ENABLE_FANOUTS
- // create the fanout info
- Fraig_NodeAddFaninFanout( Fraig_Regular(p1), pNode );
- Fraig_NodeAddFaninFanout( Fraig_Regular(p2), pNode );
-#endif
- return pNode;
-}
-
-
-/**Function*************************************************************
-
- Synopsis [Simulates the node.]
-
- Description [Simulates the random or dynamic simulation info through
- the node. Uses phases of the children to determine their real simulation
- info. Uses phase of the node to determine the way its simulation info
- is stored. The resulting info is guaranteed to be 0 for the first pattern.]
-
- SideEffects [This procedure modified the hash value of the simulation info.]
-
- SeeAlso []
-
-***********************************************************************/
-void Fraig_NodeSimulate( Fraig_Node_t * pNode, int iWordStart, int iWordStop, int fUseRand )
-{
- unsigned * pSims, * pSims1, * pSims2;
- unsigned uHash;
- int fCompl, fCompl1, fCompl2, i;
-
- assert( !Fraig_IsComplement(pNode) );
-
- // get hold of the simulation information
- pSims = fUseRand? pNode->puSimR : pNode->puSimD;
- pSims1 = fUseRand? Fraig_Regular(pNode->p1)->puSimR : Fraig_Regular(pNode->p1)->puSimD;
- pSims2 = fUseRand? Fraig_Regular(pNode->p2)->puSimR : Fraig_Regular(pNode->p2)->puSimD;
-
- // get complemented attributes of the children using their random info
- fCompl = pNode->fInv;
- fCompl1 = Fraig_NodeIsSimComplement(pNode->p1);
- fCompl2 = Fraig_NodeIsSimComplement(pNode->p2);
-
- // simulate
- uHash = 0;
- if ( fCompl1 && fCompl2 )
- {
- if ( fCompl )
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (pSims1[i] | pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- else
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = ~(pSims1[i] | pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- }
- else if ( fCompl1 && !fCompl2 )
- {
- if ( fCompl )
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (pSims1[i] | ~pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- else
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (~pSims1[i] & pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- }
- else if ( !fCompl1 && fCompl2 )
- {
- if ( fCompl )
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (~pSims1[i] | pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- else
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (pSims1[i] & ~pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- }
- else // if ( !fCompl1 && !fCompl2 )
- {
- if ( fCompl )
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = ~(pSims1[i] & pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- else
- for ( i = iWordStart; i < iWordStop; i++ )
- {
- pSims[i] = (pSims1[i] & pSims2[i]);
- uHash ^= pSims[i] * s_FraigPrimes[i];
- }
- }
-
- if ( fUseRand )
- pNode->uHashR ^= uHash;
- else
- pNode->uHashD ^= uHash;
-}
-
-
-////////////////////////////////////////////////////////////////////////
-/// END OF FILE ///
-////////////////////////////////////////////////////////////////////////
-
-ABC_NAMESPACE_IMPL_END
-
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