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-rw-r--r--src/map/mio/mioUtils.c5
-rw-r--r--src/opt/sfm/module.make3
-rw-r--r--src/opt/sfm/sfmArea.c380
-rw-r--r--src/opt/sfm/sfmDec.c5
4 files changed, 392 insertions, 1 deletions
diff --git a/src/map/mio/mioUtils.c b/src/map/mio/mioUtils.c
index 5b1185eb..7572b27c 100644
--- a/src/map/mio/mioUtils.c
+++ b/src/map/mio/mioUtils.c
@@ -733,8 +733,13 @@ Mio_Cell2_t * Mio_CollectRootsNew2( Mio_Library_t * pLib, int nInputs, int * pnG
assert( Mio_AreaCompare2( ppCells + 4, ppCells + iCell - 1 ) <= 0 );
}
// assign IDs
+ Mio_LibraryForEachGate( pLib, pGate0 )
+ Mio_GateSetCell( pGate0, -1 );
for ( i = 0; i < iCell; i++ )
+ {
ppCells[i].Id = ppCells[i].pName ? i : -1;
+ Mio_GateSetCell( (Mio_Gate_t *)ppCells[i].pMioGate, i );
+ }
// report
if ( fVerbose )
diff --git a/src/opt/sfm/module.make b/src/opt/sfm/module.make
index fbdaa2ec..66518e4e 100644
--- a/src/opt/sfm/module.make
+++ b/src/opt/sfm/module.make
@@ -1,4 +1,5 @@
-SRC += src/opt/sfm/sfmCnf.c \
+SRC += src/opt/sfm/sfmArea.c \
+ src/opt/sfm/sfmCnf.c \
src/opt/sfm/sfmCore.c \
src/opt/sfm/sfmDec.c \
src/opt/sfm/sfmLib.c \
diff --git a/src/opt/sfm/sfmArea.c b/src/opt/sfm/sfmArea.c
new file mode 100644
index 00000000..87f3b511
--- /dev/null
+++ b/src/opt/sfm/sfmArea.c
@@ -0,0 +1,380 @@
+/**CFile****************************************************************
+
+ FileName [sfmArea.c]
+
+ SystemName [ABC: Logic synthesis and verification system.]
+
+ PackageName [SAT-based optimization using internal don't-cares.]
+
+ Synopsis [Area optimization.]
+
+ Author [Alan Mishchenko]
+
+ Affiliation [UC Berkeley]
+
+ Date [Ver. 1.0. Started - June 20, 2005.]
+
+ Revision [$Id: sfmArea.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "sfmInt.h"
+#include "map/mio/mio.h"
+#include "misc/util/utilTruth.h"
+#include "misc/util/utilNam.h"
+#include "map/scl/sclLib.h"
+#include "map/scl/sclCon.h"
+#include "opt/dau/dau.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+/// DECLARATIONS ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+/// FUNCTION DEFINITIONS ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+ Synopsis [Precompute cell parameters.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+Vec_Int_t * Abc_NtkPrecomputeCellPairs( Mio_Cell2_t * pCells, int nCells )
+{
+ Vec_Int_t * vInfo = Vec_IntAlloc( 1000 );
+ word iBestArea, tCur, iThis;
+ int * pPerm[7], nPerms[7], Perm[7], * Perm1, * Perm2;
+ int iBestCell, iBestPerm, iBestDiff;
+ int i, k, n, v, p, Count = 0;
+ int iGate1 = -1, iGate2 = -1;
+
+ for ( i = 1; i <= 6; i++ )
+ pPerm[i] = Extra_PermSchedule( i );
+ for ( i = 1; i <= 6; i++ )
+ nPerms[i] = Extra_Factorial( i );
+
+ for ( i = 2; i < nCells; i++ )
+ {
+ int nFanins = pCells[i].nFanins;
+ for ( n = 0; n <= nFanins; n++ )
+ {
+ // get the truth table
+ iThis = (n == nFanins) ? ~pCells[i].uTruth : Abc_Tt6Flip(pCells[i].uTruth, n);
+ // init the comparison
+ iBestArea = ~((word)0);
+ iBestCell = iBestPerm = iBestDiff = -1;
+ // iterate through cells
+ for ( k = 2; k < nCells; k++ )
+ {
+ if ( nFanins != (int)pCells[k].nFanins )
+ continue;
+ if ( i != k && pCells[i].uTruth == pCells[k].uTruth )
+ {
+ iGate1 = i;
+ iGate2 = k;
+ Count++;
+ continue;
+ }
+ // set unit permutation
+ for ( v = 0; v < nFanins; v++ )
+ Perm[v] = v;
+ // go through all permutation of Cell[k]
+ tCur = pCells[k].uTruth;
+ for ( p = 0; p < nPerms[nFanins]; p++ )
+ {
+ if ( iThis == tCur && iBestArea > pCells[k].AreaW )
+ {
+ iBestArea = pCells[k].AreaW;
+ iBestCell = k;
+ iBestPerm = 0;
+ for ( v = 0; v < nFanins; v++ )
+ iBestPerm |= (v << (Perm[v] << 2));
+ iBestDiff = (pCells[i].AreaW >= pCells[k].AreaW) ? (int)(pCells[i].AreaW - pCells[k].AreaW) : -(int)(pCells[k].AreaW - pCells[i].AreaW);
+ }
+ if ( nPerms[nFanins] == 1 )
+ continue;
+ // update
+ tCur = Abc_Tt6SwapAdjacent( tCur, pPerm[nFanins][p] );
+ Perm1 = Perm + pPerm[nFanins][p];
+ Perm2 = Perm1 + 1;
+ ABC_SWAP( int, *Perm1, *Perm2 );
+ }
+ assert( tCur == pCells[k].uTruth );
+ }
+ Vec_IntPushThree( vInfo, iBestCell, iBestPerm, iBestDiff );
+ }
+ }
+
+ for ( i = 1; i <= 6; i++ )
+ ABC_FREE( pPerm[i] );
+ if ( Count )
+ printf( "In this library, %d cell pairs have equal functions (for example, %s and %s).\n", Count/2, pCells[iGate1].pName, pCells[iGate2].pName );
+ return vInfo;
+}
+Vec_Int_t * Abc_NtkPrecomputeFirsts( Mio_Cell2_t * pCells, int nCells )
+{
+ int i, Index = 0;
+ Vec_Int_t * vFirst = Vec_IntStartFull( 2 );
+ for ( i = 2; i < nCells; i++ )
+ {
+ Vec_IntPush( vFirst, Index );
+ Index += 3 * (pCells[i].nFanins + 1);
+ }
+ assert( nCells == Vec_IntSize(vFirst) );
+ return vFirst;
+}
+int Abc_NtkPrecomputePrint( Mio_Cell2_t * pCells, int nCells, Vec_Int_t * vInfo )
+{
+ int i, n, v, Index = 0, nRecUsed = 0;
+ for ( i = 2; i < nCells; i++ )
+ {
+ int nFanins = pCells[i].nFanins;
+ printf( "%3d : %8s Fanins = %d ", i, pCells[i].pName, nFanins );
+ Dau_DsdPrintFromTruth( &pCells[i].uTruth, nFanins );
+ for ( n = 0; n <= nFanins; n++, Index += 3 )
+ {
+ int iCellA = Vec_IntEntry( vInfo, Index+0 );
+ int iPerm = Vec_IntEntry( vInfo, Index+1 );
+ int Diff = Vec_IntEntry( vInfo, Index+2 );
+ if ( iCellA == -1 )
+ continue;
+ printf( "%d : {", n );
+ for ( v = 0; v < nFanins; v++ )
+ printf( " %d ", (iPerm >> (v << 2)) & 15 );
+ printf( "} Index = %d ", Index );
+
+ printf( "Gain = %6.2f ", Scl_Int2Flt(Diff) );
+ Dau_DsdPrintFromTruth( &pCells[iCellA].uTruth, pCells[iCellA].nFanins );
+ nRecUsed++;
+ }
+ }
+ return nRecUsed;
+}
+
+void Abc_NtkPrecomputeCellPairsTest()
+{
+ int nCells;
+ Mio_Cell2_t * pCells = Mio_CollectRootsNewDefault2( 6, &nCells, 0 );
+ Vec_Int_t * vInfo = Abc_NtkPrecomputeCellPairs( pCells, nCells );
+ int nRecUsed = Abc_NtkPrecomputePrint( pCells, nCells, vInfo );
+ // iterate through the cells
+ Vec_Int_t * vFirst = Abc_NtkPrecomputeFirsts( pCells, nCells );
+ printf( "Used records = %d. All records = %d.\n", nRecUsed, Vec_IntSize(vInfo)/3 - nRecUsed );
+ assert( nCells == Vec_IntSize(vFirst) );
+ Vec_IntFree( vFirst );
+ Vec_IntFree( vInfo );
+ ABC_FREE( pCells );
+}
+
+int Abc_NodeCheckFanoutHasFanin( Abc_Obj_t * pNode, Abc_Obj_t * pFanin )
+{
+ Abc_Obj_t * pThis;
+ int i;
+ Abc_ObjForEachFanout( pNode, pThis, i )
+ if ( Abc_NodeFindFanin(pThis, pFanin) >= 0 )
+ return i;
+ return -1;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Evaluate changes.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Abc_ObjHasDupFanins( Abc_Obj_t * pObj )
+{
+ int * pArray = pObj->vFanins.pArray;
+ int i, k, Limit = Abc_ObjFaninNum(pObj);
+ for ( i = 0; i < Limit; i++ )
+ for ( k = i+1; k < Limit; k++ )
+ if ( pArray[i] == pArray[k] )
+ return 1;
+ return 0;
+}
+int Abc_ObjHasDupFanouts( Abc_Obj_t * pObj )
+{
+ int * pArray = pObj->vFanouts.pArray;
+ int i, k, Limit = Abc_ObjFanoutNum(pObj);
+ for ( i = 0; i < Limit; i++ )
+ for ( k = i+1; k < Limit; k++ )
+ if ( pArray[i] == pArray[k] )
+ return 1;
+ return 0;
+}
+int Abc_ObjChangeEval( Abc_Obj_t * pObj, Vec_Int_t * vInfo, Vec_Int_t * vFirst, int InvArea, int * pfUseInv )
+{
+ Abc_Obj_t * pNext;
+ Mio_Gate_t * pGate = (Mio_Gate_t *)pObj->pData;
+ int iFanCell, iNodeCell = Mio_GateReadCell( (Mio_Gate_t *)pObj->pData );
+ int * pFanInfo, * pNodeInfo = Vec_IntEntryP( vInfo, Vec_IntEntry(vFirst, iNodeCell) );
+ int i, fNeedInv = 0, Gain = 0, iFanin = Abc_ObjFaninNum(pObj), fUseInv = Abc_NodeIsInv(pObj);
+ assert( iFanin > 0 );
+ *pfUseInv = 0;
+ if ( pNodeInfo[3*iFanin] == -1 )
+ return 0;
+ if ( fUseInv )
+ Gain = InvArea;
+ else
+ Gain = pNodeInfo[3*iFanin+2];
+ Abc_ObjForEachFanout( pObj, pNext, i )
+ {
+ if ( fUseInv && Abc_NodeFindFanin(pNext, Abc_ObjFanin0(pObj)) >= 0 )
+ return 0;
+ if ( Abc_ObjHasDupFanins(pNext) )
+ return 0;
+ if ( !Abc_ObjIsNode(pNext) || Abc_NodeIsBuf(pNext) )
+ {
+ fNeedInv = 1;
+ continue;
+ }
+ if ( Abc_NodeIsInv(pNext) )
+ {
+ if ( Abc_NodeCheckFanoutHasFanin(pNext, pObj) >= 0 )
+ return 0;
+ Gain += InvArea;
+ continue;
+ }
+ iFanCell = Mio_GateReadCell( (Mio_Gate_t *)pNext->pData );
+ pFanInfo = Vec_IntEntryP( vInfo, Vec_IntEntry(vFirst, iFanCell) );
+ iFanin = Abc_NodeFindFanin( pNext, pObj );
+ if ( pFanInfo[3*iFanin] == -1 )
+ {
+ fNeedInv = 1;
+ continue;
+ }
+ Gain += pFanInfo[3*iFanin+2];
+ }
+ if ( fNeedInv )
+ Gain -= InvArea;
+ *pfUseInv = fNeedInv;
+ return Gain;
+}
+void Abc_ObjChangeUpdate( Abc_Obj_t * pObj, int iFanin, Mio_Cell2_t * pCells, int * pNodeInfo, Vec_Int_t * vTemp )
+{
+ int v, Perm, iNodeCell = pNodeInfo[3*iFanin];
+ Mio_Gate_t * pGate = (Mio_Gate_t *)pObj->pData;
+ //Abc_ObjPrint( stdout, pObj );
+ //printf( "Replacing fanout %d with %s by %s with fanin %d.\n", Abc_ObjId(pObj), Mio_GateReadName(pGate), Mio_GateReadName((Mio_Gate_t *)pCells[iNodeCell].pMioGate), iFanin );
+ pObj->pData = (Mio_Gate_t *)pCells[iNodeCell].pMioGate;
+ Perm = pNodeInfo[3*iFanin+1];
+ Vec_IntClear( vTemp );
+ for ( v = 0; v < Abc_ObjFaninNum(pObj); v++ )
+ Vec_IntPush( vTemp, Abc_ObjFaninId(pObj, (Perm >> (v << 2)) & 15) );
+ Vec_IntClear( &pObj->vFanins );
+ Vec_IntAppend( &pObj->vFanins, vTemp );
+}
+void Abc_ObjChangePerform( Abc_Obj_t * pObj, Vec_Int_t * vInfo, Vec_Int_t * vFirst, int fUseInv, Vec_Int_t * vTemp, Vec_Ptr_t * vFanout, Vec_Ptr_t * vFanout2, Mio_Cell2_t * pCells )
+{
+ Abc_Obj_t * pNext, * pNext2, * pNodeInv = NULL;
+ int iFanCell, iNodeCell = Mio_GateReadCell( (Mio_Gate_t *)pObj->pData );
+ int * pFanInfo, * pNodeInfo = Vec_IntEntryP( vInfo, Vec_IntEntry(vFirst, iNodeCell) );
+ int i, k, iFanin = Abc_ObjFaninNum(pObj);
+ assert( iFanin > 0 && pNodeInfo[3*iFanin] != -1 );
+ // update the node
+ Abc_NodeCollectFanouts( pObj, vFanout );
+ if ( Abc_NodeIsInv(pObj) )
+ {
+ Abc_Obj_t * pFanin = Abc_ObjFanin0(pObj);
+ Vec_PtrForEachEntry( Abc_Obj_t *, vFanout, pNext, k )
+ Abc_ObjPatchFanin( pNext, pObj, pFanin );
+ assert( Abc_ObjFanoutNum(pObj) == 0 );
+ Abc_NtkDeleteObj(pObj);
+ pObj = pFanin;
+ assert( fUseInv == 0 );
+ }
+ else
+ Abc_ObjChangeUpdate( pObj, iFanin, pCells, pNodeInfo, vTemp );
+ // add inverter if needed
+ if ( fUseInv )
+ pNodeInv = Abc_NtkCreateNodeInv(pObj->pNtk, pObj);
+ // update the fanouts
+ Vec_PtrForEachEntry( Abc_Obj_t *, vFanout, pNext, i )
+ {
+ if ( !Abc_ObjIsNode(pNext) || Abc_NodeIsBuf(pNext) )
+ {
+ Abc_ObjPatchFanin( pNext, pObj, pNodeInv );
+ continue;
+ }
+ if ( Abc_NodeIsInv(pNext) )
+ {
+ Abc_NodeCollectFanouts( pNext, vFanout2 );
+ Vec_PtrForEachEntry( Abc_Obj_t *, vFanout2, pNext2, k )
+ Abc_ObjPatchFanin( pNext2, pNext, pObj );
+ assert( Abc_ObjFanoutNum(pNext) == 0 );
+ Abc_NtkDeleteObj(pNext);
+ continue;
+ }
+ iFanin = Abc_NodeFindFanin( pNext, pObj );
+ iFanCell = Mio_GateReadCell( (Mio_Gate_t *)pNext->pData );
+ pFanInfo = Vec_IntEntryP( vInfo, Vec_IntEntry(vFirst, iFanCell) );
+ if ( pFanInfo[3*iFanin] == -1 )
+ {
+ Abc_ObjPatchFanin( pNext, pObj, pNodeInv );
+ continue;
+ }
+ Abc_ObjChangeUpdate( pNext, iFanin, pCells, pFanInfo, vTemp );
+ }
+}
+void Abc_NtkChangePerform( Abc_Ntk_t * pNtk, int fVerbose )
+{
+ abctime clk = Abc_Clock();
+ int i, fNeedInv, nCells, Gain, GainAll = 0, Count = 0, CountInv = 0;
+ Mio_Cell2_t * pCells = Mio_CollectRootsNewDefault2( 6, &nCells, 0 );
+ Vec_Int_t * vInfo = Abc_NtkPrecomputeCellPairs( pCells, nCells );
+ Vec_Int_t * vFirst = Abc_NtkPrecomputeFirsts( pCells, nCells );
+
+ Vec_Ptr_t * vFanout = Vec_PtrAlloc( 100 );
+ Vec_Ptr_t * vFanout2 = Vec_PtrAlloc( 100 );
+ Vec_Int_t * vTemp = Vec_IntAlloc( 100 );
+ Abc_Obj_t * pObj;
+ Abc_NtkForEachNode( pNtk, pObj, i )
+ {
+ if ( Abc_ObjFaninNum(pObj) < 2 && !Abc_NodeIsInv(pObj) )
+ continue;
+ if ( Abc_ObjHasDupFanouts(pObj) )
+ continue;
+ Gain = Abc_ObjChangeEval( pObj, vInfo, vFirst, (int)pCells[3].AreaW, &fNeedInv );
+ if ( Gain <= 0 )
+ continue;
+ //printf( "Obj %d\n", Abc_ObjId(pObj) );
+ Count++;
+ CountInv += Abc_NodeIsInv(pObj);
+ GainAll += Gain;
+ Abc_ObjChangePerform( pObj, vInfo, vFirst, fNeedInv, vTemp, vFanout, vFanout2, pCells );
+ }
+ Vec_PtrFree( vFanout2 );
+ Vec_PtrFree( vFanout );
+ Vec_IntFree( vTemp );
+
+ Vec_IntFree( vFirst );
+ Vec_IntFree( vInfo );
+ ABC_FREE( pCells );
+
+ if ( fVerbose )
+ printf( "Total gain in area = %6.2f after %d changes (including %d inverters). ", Scl_Int2Flt(GainAll), Count, CountInv );
+ if ( fVerbose )
+ Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+}
+
+////////////////////////////////////////////////////////////////////////
+/// END OF FILE ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/opt/sfm/sfmDec.c b/src/opt/sfm/sfmDec.c
index bce20624..c5af0ac0 100644
--- a/src/opt/sfm/sfmDec.c
+++ b/src/opt/sfm/sfmDec.c
@@ -2152,6 +2152,11 @@ void Abc_NtkPerformMfs3( Abc_Ntk_t * pNtk, Sfm_Par_t * pPars )
if ( pPars->fLibVerbose )
Sfm_LibPrint( p->pLib );
Sfm_DecStop( p );
+ if ( pPars->fArea )
+ {
+ extern void Abc_NtkChangePerform( Abc_Ntk_t * pNtk, int fVerbose );
+ Abc_NtkChangePerform( pNtk, pPars->fVerbose );
+ }
}
////////////////////////////////////////////////////////////////////////
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