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-rw-r--r--src/aig/dar/darCut.c752
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diff --git a/src/aig/dar/darCut.c b/src/aig/dar/darCut.c
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-/**CFile****************************************************************
-
- FileName [darCut.c]
-
- SystemName [ABC: Logic synthesis and verification system.]
-
- PackageName [DAG-aware AIG rewriting.]
-
- Synopsis [Computation of 4-input cuts.]
-
- Author [Alan Mishchenko]
-
- Affiliation [UC Berkeley]
-
- Date [Ver. 1.0. Started - April 28, 2007.]
-
- Revision [$Id: darCut.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
-
-***********************************************************************/
-
-#include "darInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-/// DECLARATIONS ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-/// FUNCTION DEFINITIONS ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
- Synopsis [Prints one cut.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-void Dar_CutPrint( Dar_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 Dar_ObjCutPrint( Aig_Man_t * p, Aig_Obj_t * pObj )
-{
- Dar_Cut_t * pCut;
- int i;
- printf( "Cuts for node %d:\n", pObj->Id );
- Dar_ObjForEachCut( pObj, pCut, i )
- Dar_CutPrint( pCut );
-// printf( "\n" );
-}
-
-/**Function*************************************************************
-
- Synopsis [Returns the number of 1s in the machine word.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_WordCountOnes( unsigned uWord )
-{
- uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
- uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
- uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
- uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
- return (uWord & 0x0000FFFF) + (uWord>>16);
-}
-
-/**Function*************************************************************
-
- Synopsis [Compute the cost of the cut.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutFindValue( Dar_Man_t * p, Dar_Cut_t * pCut )
-{
- Aig_Obj_t * pLeaf;
- int i, Value, nOnes;
- assert( pCut->fUsed );
- Value = 0;
- nOnes = 0;
- Dar_CutForEachLeaf( p->pAig, pCut, pLeaf, i )
- {
- if ( pLeaf == NULL )
- return 0;
- assert( pLeaf != NULL );
- Value += pLeaf->nRefs;
- nOnes += (pLeaf->nRefs == 1);
- }
- if ( pCut->nLeaves < 2 )
- return 1001;
-// Value = Value * 100 / pCut->nLeaves;
- if ( Value > 1000 )
- Value = 1000;
- if ( nOnes > 3 )
- Value = 5 - nOnes;
- return Value;
-}
-
-/**Function*************************************************************
-
- Synopsis [Returns the next free cut to use.]
-
- Description [Uses the cut with the smallest value.]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline Dar_Cut_t * Dar_CutFindFree( Dar_Man_t * p, Aig_Obj_t * pObj )
-{
- Dar_Cut_t * pCut, * pCutMax;
- int i;
- pCutMax = NULL;
- Dar_ObjForEachCutAll( pObj, pCut, i )
- {
- if ( pCut->fUsed == 0 )
- return pCut;
- if ( pCut->nLeaves < 3 )
- continue;
- if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
- pCutMax = pCut;
- }
- if ( pCutMax == NULL )
- {
- Dar_ObjForEachCutAll( pObj, pCut, i )
- {
- if ( pCut->nLeaves < 2 )
- continue;
- if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
- pCutMax = pCut;
- }
- }
- if ( pCutMax == NULL )
- {
- Dar_ObjForEachCutAll( pObj, pCut, i )
- {
- if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
- pCutMax = pCut;
- }
- }
- assert( pCutMax != NULL );
- pCutMax->fUsed = 0;
- return pCutMax;
-}
-
-/**Function*************************************************************
-
- Synopsis [Returns 1 if pDom is contained in pCut.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutCheckDominance( Dar_Cut_t * pDom, Dar_Cut_t * pCut )
-{
- int i, k;
- assert( pDom->fUsed && pCut->fUsed );
- 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 the cut is contained.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutFilter( Aig_Obj_t * pObj, Dar_Cut_t * pCut )
-{
- Dar_Cut_t * pTemp;
- int i;
- assert( pCut->fUsed );
- // go through the cuts of the node
- Dar_ObjForEachCut( pObj, pTemp, i )
- {
- if ( pTemp == pCut )
- continue;
- if ( pTemp->nLeaves > pCut->nLeaves )
- {
- // skip the non-contained cuts
- if ( (pTemp->uSign & pCut->uSign) != pCut->uSign )
- continue;
- // check containment seriously
- if ( Dar_CutCheckDominance( pCut, pTemp ) )
- {
- // remove contained cut
- pTemp->fUsed = 0;
- }
- }
- else
- {
- // skip the non-contained cuts
- if ( (pTemp->uSign & pCut->uSign) != pTemp->uSign )
- continue;
- // check containment seriously
- if ( Dar_CutCheckDominance( pTemp, pCut ) )
- {
- // remove the given cut
- pCut->fUsed = 0;
- return 1;
- }
- }
- }
- return 0;
-}
-
-/**Function*************************************************************
-
- Synopsis [Merges two cuts.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutMergeOrdered( Dar_Cut_t * pC, Dar_Cut_t * pC0, Dar_Cut_t * pC1 )
-{
- int i, k, c;
- assert( pC0->nLeaves >= pC1->nLeaves );
-
- // the case of the largest cut sizes
- if ( pC0->nLeaves == 4 && pC1->nLeaves == 4 )
- {
- if ( pC0->uSign != pC1->uSign )
- return 0;
- 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 == 4 )
- {
- if ( (pC0->uSign & pC1->uSign) != pC1->uSign )
- return 0;
- 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 < 4; 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 [Prepares the object for FPGA mapping.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutMerge( Dar_Cut_t * pCut, Dar_Cut_t * pCut0, Dar_Cut_t * pCut1 )
-{
- assert( !pCut->fUsed );
- // merge the nodes
- if ( pCut0->nLeaves <= pCut1->nLeaves )
- {
- if ( !Dar_CutMergeOrdered( pCut, pCut1, pCut0 ) )
- return 0;
- }
- else
- {
- if ( !Dar_CutMergeOrdered( pCut, pCut0, pCut1 ) )
- return 0;
- }
- pCut->uSign = pCut0->uSign | pCut1->uSign;
- pCut->fUsed = 1;
- return 1;
-}
-
-
-/**Function*************************************************************
-
- Synopsis [Computes the stretching phase of the cut w.r.t. the merged cut.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline unsigned Dar_CutTruthPhase( Dar_Cut_t * pCut, Dar_Cut_t * pCut1 )
-{
- unsigned uPhase = 0;
- int i, k;
- for ( i = k = 0; i < (int)pCut->nLeaves; i++ )
- {
- if ( k == (int)pCut1->nLeaves )
- break;
- if ( pCut->pLeaves[i] < pCut1->pLeaves[k] )
- continue;
- assert( pCut->pLeaves[i] == pCut1->pLeaves[k] );
- uPhase |= (1 << i);
- k++;
- }
- return uPhase;
-}
-
-/**Function*************************************************************
-
- Synopsis [Swaps two advancent variables of the truth table.]
-
- Description [Swaps variable iVar and iVar+1.]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline unsigned Dar_CutTruthSwapAdjacentVars( unsigned uTruth, int iVar )
-{
- assert( iVar >= 0 && iVar <= 2 );
- if ( iVar == 0 )
- return (uTruth & 0x99999999) | ((uTruth & 0x22222222) << 1) | ((uTruth & 0x44444444) >> 1);
- if ( iVar == 1 )
- return (uTruth & 0xC3C3C3C3) | ((uTruth & 0x0C0C0C0C) << 2) | ((uTruth & 0x30303030) >> 2);
- if ( iVar == 2 )
- return (uTruth & 0xF00FF00F) | ((uTruth & 0x00F000F0) << 4) | ((uTruth & 0x0F000F00) >> 4);
- assert( 0 );
- return 0;
-}
-
-/**Function*************************************************************
-
- Synopsis [Expands the truth table according to the phase.]
-
- Description [The input and output truth tables are in pIn/pOut. The current number
- of variables is nVars. The total number of variables in nVarsAll. The last argument
- (Phase) contains shows where the variables should go.]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline unsigned Dar_CutTruthStretch( unsigned uTruth, int nVars, unsigned Phase )
-{
- int i, k, Var = nVars - 1;
- for ( i = 3; i >= 0; i-- )
- if ( Phase & (1 << i) )
- {
- for ( k = Var; k < i; k++ )
- uTruth = Dar_CutTruthSwapAdjacentVars( uTruth, k );
- Var--;
- }
- assert( Var == -1 );
- return uTruth;
-}
-
-/**Function*************************************************************
-
- Synopsis [Shrinks the truth table according to the phase.]
-
- Description [The input and output truth tables are in pIn/pOut. The current number
- of variables is nVars. The total number of variables in nVarsAll. The last argument
- (Phase) contains shows what variables should remain.]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline unsigned Dar_CutTruthShrink( unsigned uTruth, int nVars, unsigned Phase )
-{
- int i, k, Var = 0;
- for ( i = 0; i < 4; i++ )
- if ( Phase & (1 << i) )
- {
- for ( k = i-1; k >= Var; k-- )
- uTruth = Dar_CutTruthSwapAdjacentVars( uTruth, k );
- Var++;
- }
- return uTruth;
-}
-
-/**Function*************************************************************
-
- Synopsis [Performs truth table computation.]
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline unsigned Dar_CutTruth( Dar_Cut_t * pCut, Dar_Cut_t * pCut0, Dar_Cut_t * pCut1, int fCompl0, int fCompl1 )
-{
- unsigned uTruth0 = fCompl0 ? ~pCut0->uTruth : pCut0->uTruth;
- unsigned uTruth1 = fCompl1 ? ~pCut1->uTruth : pCut1->uTruth;
- uTruth0 = Dar_CutTruthStretch( uTruth0, pCut0->nLeaves, Dar_CutTruthPhase(pCut, pCut0) );
- uTruth1 = Dar_CutTruthStretch( uTruth1, pCut1->nLeaves, Dar_CutTruthPhase(pCut, pCut1) );
- return uTruth0 & uTruth1;
-}
-
-/**Function*************************************************************
-
- Synopsis [Minimize support of the cut.]
-
- Description [Returns 1 if the node's support has changed]
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-static inline int Dar_CutSuppMinimize( Dar_Cut_t * pCut )
-{
- unsigned uMasks[4][2] = {
- { 0x5555, 0xAAAA },
- { 0x3333, 0xCCCC },
- { 0x0F0F, 0xF0F0 },
- { 0x00FF, 0xFF00 }
- };
- unsigned uPhase = 0, uTruth = 0xFFFF & pCut->uTruth;
- int i, k, nLeaves;
- assert( pCut->fUsed );
- // compute the support of the cut's function
- nLeaves = pCut->nLeaves;
- for ( i = 0; i < (int)pCut->nLeaves; i++ )
- if ( (uTruth & uMasks[i][0]) == ((uTruth & uMasks[i][1]) >> (1 << i)) )
- nLeaves--;
- else
- uPhase |= (1 << i);
- if ( nLeaves == (int)pCut->nLeaves )
- return 0;
- // shrink the truth table
- uTruth = Dar_CutTruthShrink( uTruth, pCut->nLeaves, uPhase );
- pCut->uTruth = 0xFFFF & uTruth;
- // update leaves and signature
- pCut->uSign = 0;
- for ( i = k = 0; i < (int)pCut->nLeaves; i++ )
- {
- if ( !(uPhase & (1 << i)) )
- continue;
- pCut->pLeaves[k++] = pCut->pLeaves[i];
- pCut->uSign |= Aig_ObjCutSign( pCut->pLeaves[i] );
- }
- assert( k == nLeaves );
- pCut->nLeaves = nLeaves;
- return 1;
-}
-
-/**Function*************************************************************
-
- Synopsis []
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-void Dar_ManCutsFree( Dar_Man_t * p )
-{
- if ( p->pMemCuts == NULL )
- return;
- Aig_MmFixedStop( p->pMemCuts, 0 );
- p->pMemCuts = NULL;
-// Aig_ManCleanData( p );
-}
-
-/**Function*************************************************************
-
- Synopsis []
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Dar_Cut_t * Dar_ObjPrepareCuts( Dar_Man_t * p, Aig_Obj_t * pObj )
-{
- Dar_Cut_t * pCutSet, * pCut;
- int i;
- assert( Dar_ObjCuts(pObj) == NULL );
- pObj->nCuts = p->pPars->nCutsMax;
- // create the cutset of the node
- pCutSet = (Dar_Cut_t *)Aig_MmFixedEntryFetch( p->pMemCuts );
- memset( pCutSet, 0, p->pPars->nCutsMax * sizeof(Dar_Cut_t) );
- Dar_ObjSetCuts( pObj, pCutSet );
- Dar_ObjForEachCutAll( pObj, pCut, i )
- pCut->fUsed = 0;
- Vec_PtrPush( p->vCutNodes, pObj );
- // add unit cut if needed
- pCut = pCutSet;
- pCut->fUsed = 1;
- if ( Aig_ObjIsConst1(pObj) )
- {
- pCut->nLeaves = 0;
- pCut->uSign = 0;
- pCut->uTruth = 0xFFFF;
- }
- else
- {
- pCut->nLeaves = 1;
- pCut->pLeaves[0] = pObj->Id;
- pCut->uSign = Aig_ObjCutSign( pObj->Id );
- pCut->uTruth = 0xAAAA;
- }
- pCut->Value = Dar_CutFindValue( p, pCut );
- if ( p->nCutMemUsed < Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) )
- p->nCutMemUsed = Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20);
- return pCutSet;
-}
-
-/**Function*************************************************************
-
- Synopsis []
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-void Dar_ManCutsRestart( Dar_Man_t * p, Aig_Obj_t * pRoot )
-{
- Aig_Obj_t * pObj;
- int i;
- Dar_ObjSetCuts( Aig_ManConst1(p->pAig), NULL );
- Vec_PtrForEachEntry( Aig_Obj_t *, p->vCutNodes, pObj, i )
- if ( !Aig_ObjIsNone(pObj) )
- Dar_ObjSetCuts( pObj, NULL );
- Vec_PtrClear( p->vCutNodes );
- Aig_MmFixedRestart( p->pMemCuts );
- Dar_ObjPrepareCuts( p, Aig_ManConst1(p->pAig) );
-}
-
-/**Function*************************************************************
-
- Synopsis []
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Dar_Cut_t * Dar_ObjComputeCuts( Dar_Man_t * p, Aig_Obj_t * pObj )
-{
- Aig_Obj_t * pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
- Aig_Obj_t * pFanin1 = Aig_ObjReal_rec( Aig_ObjChild1(pObj) );
- Aig_Obj_t * pFaninR0 = Aig_Regular(pFanin0);
- Aig_Obj_t * pFaninR1 = Aig_Regular(pFanin1);
- Dar_Cut_t * pCutSet, * pCut0, * pCut1, * pCut;
- int i, k, RetValue;
-
- assert( !Aig_IsComplement(pObj) );
- assert( Aig_ObjIsNode(pObj) );
- assert( Dar_ObjCuts(pObj) == NULL );
- assert( Dar_ObjCuts(pFaninR0) != NULL );
- assert( Dar_ObjCuts(pFaninR1) != NULL );
-
- // set up the first cut
- pCutSet = Dar_ObjPrepareCuts( p, pObj );
- // make sure fanins cuts are computed
- Dar_ObjForEachCut( pFaninR0, pCut0, i )
- Dar_ObjForEachCut( pFaninR1, pCut1, k )
- {
- p->nCutsAll++;
- // make sure K-feasible cut exists
- if ( Dar_WordCountOnes(pCut0->uSign | pCut1->uSign) > 4 )
- continue;
- // get the next cut of this node
- pCut = Dar_CutFindFree( p, pObj );
- // create the new cut
- if ( !Dar_CutMerge( pCut, pCut0, pCut1 ) )
- {
- assert( !pCut->fUsed );
- continue;
- }
- p->nCutsTried++;
- // check dominance
- if ( Dar_CutFilter( pObj, pCut ) )
- {
- assert( !pCut->fUsed );
- continue;
- }
- // compute truth table
- pCut->uTruth = 0xFFFF & Dar_CutTruth( pCut, pCut0, pCut1, Aig_IsComplement(pFanin0), Aig_IsComplement(pFanin1) );
-
- // minimize support of the cut
- if ( Dar_CutSuppMinimize( pCut ) )
- {
- RetValue = Dar_CutFilter( pObj, pCut );
- assert( !RetValue );
- }
-
- // assign the value of the cut
- pCut->Value = Dar_CutFindValue( p, pCut );
- // if the cut contains removed node, do not use it
- if ( pCut->Value == 0 )
- {
- p->nCutsSkipped++;
- pCut->fUsed = 0;
- }
- else if ( pCut->nLeaves < 2 )
- return pCutSet;
- }
- // count the number of nontrivial cuts cuts
- Dar_ObjForEachCut( pObj, pCut, i )
- p->nCutsUsed += pCut->fUsed;
- // discount trivial cut
- p->nCutsUsed--;
- return pCutSet;
-}
-
-/**Function*************************************************************
-
- Synopsis []
-
- Description []
-
- SideEffects []
-
- SeeAlso []
-
-***********************************************************************/
-Dar_Cut_t * Dar_ObjComputeCuts_rec( Dar_Man_t * p, Aig_Obj_t * pObj )
-{
- if ( Dar_ObjCuts(pObj) )
- return Dar_ObjCuts(pObj);
- if ( Aig_ObjIsPi(pObj) )
- return Dar_ObjPrepareCuts( p, pObj );
- if ( Aig_ObjIsBuf(pObj) )
- return Dar_ObjComputeCuts_rec( p, Aig_ObjFanin0(pObj) );
- Dar_ObjComputeCuts_rec( p, Aig_ObjFanin0(pObj) );
- Dar_ObjComputeCuts_rec( p, Aig_ObjFanin1(pObj) );
- return Dar_ObjComputeCuts( p, pObj );
-}
-
-////////////////////////////////////////////////////////////////////////
-/// END OF FILE ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
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