Experiments with precomputation and matching.

4 files changed, 285 insertions, 2 deletions

diff --git a/src/opt/sfm/module.make b/src/opt/sfm/module.make
index d9306418..788b7923 100644
--- a/src/opt/sfm/module.make
+++ b/src/opt/sfm/module.make
@@ -4,4 +4,5 @@ SRC +=    src/opt/sfm/sfmCnf.c \
     src/opt/sfm/sfmLib.c \
     src/opt/sfm/sfmNtk.c \
     src/opt/sfm/sfmSat.c \
+    src/opt/sfm/sfmTime.c \
     src/opt/sfm/sfmWin.c
diff --git a/src/opt/sfm/sfm.h b/src/opt/sfm/sfm.h
index f3557de0..ea40f908 100644
--- a/src/opt/sfm/sfm.h
+++ b/src/opt/sfm/sfm.h
@@ -58,6 +58,7 @@ struct Sfm_Par_t_
     int             fRrOnly;       // perform redundance removal
     int             fArea;         // performs optimization for area
     int             fMoreEffort;   // performs high-affort minimization
+    int             fUseAndOr;     // enable internal detection of AND/OR gates
     int             fZeroCost;     // enable zero-cost replacement
     int             fUseSim;       // enable simulation
     int             fPrintDecs;    // enable printing decompositions
diff --git a/src/opt/sfm/sfmDec.c b/src/opt/sfm/sfmDec.c
index 2e986c84..da88521b 100644
--- a/src/opt/sfm/sfmDec.c
+++ b/src/opt/sfm/sfmDec.c
@@ -147,6 +147,9 @@ void Sfm_ParSetDefault3( Sfm_Par_t * pPars )
     pPars->nWinSizeMax  =  300;  // the maximum window size
     pPars->nGrowthLevel =    0;  // the maximum allowed growth in level
     pPars->nBTLimit     = 5000;  // the maximum number of conflicts in one SAT run
+    pPars->fUseAndOr    =    0;  // enable internal detection of AND/OR gates
+    pPars->fZeroCost    =    0;  // enable zero-cost replacement
+    pPars->fUseSim      =    0;  // enable simulation
     pPars->fArea        =    0;  // performs optimization for area
     pPars->fVerbose     =    0;  // enable basic stats
     pPars->fVeryVerbose =    0;  // enable detailed stats
@@ -900,8 +903,9 @@ int Sfm_DecPeformDec_rec( Sfm_Dec_t * p, word * pTruth, int * pSupp, int * pAssu
             printf( "Found variable %s%d.\n", Abc_LitIsCompl(Impls[0]) ? "!":"", pSupp[0] );
         return 1;        
     }
-/*
+
     // try using all implications at once
+    if ( p->pPars->fUseAndOr )
     for ( c = 0; c < 2; c++ )
     {
         if ( Vec_IntSize(&p->vImpls[!c]) < 2 )
@@ -965,7 +969,7 @@ int Sfm_DecPeformDec_rec( Sfm_Dec_t * p, word * pTruth, int * pSupp, int * pAssu
                 *Vec_WrdEntryP(&p->vSets[c], i) |= ((word)1 << p->nPats[c]);
         p->uMask[c] |= ((word)1 << p->nPats[c]++);
     }
-*/
+
     // find the best cofactoring variable
     Var = -1, CostMin = ABC_INFINITY;
     for ( c = 0; c < 2; c++ )
diff --git a/src/opt/sfm/sfmTime.c b/src/opt/sfm/sfmTime.c
new file mode 100644
index 00000000..eb5d042c
--- /dev/null
+++ b/src/opt/sfm/sfmTime.c
@@ -0,0 +1,277 @@
+/**CFile****************************************************************
+
+  FileName    [sfmTime.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based optimization using internal don't-cares.]
+
+  Synopsis    [Timing manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: sfmTime.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "sfmInt.h"
+#include "misc/st/st.h"
+#include "map/mio/mio.h"
+#include "base/abc/abc.h"
+#include "misc/util/utilNam.h"
+#include "map/scl/sclCon.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Sfm_Tim_t_ Sfm_Tim_t;
+struct Sfm_Tim_t_
+{
+    // external
+    Mio_Library_t *   pLib;        // library
+    Scl_Con_t *       pExt;        // external timing
+    Abc_Ntk_t *       pNtk;        // mapped network
+    int               Delay;       // the largest delay
+    // timing info
+    Vec_Int_t         vTimArrs;    // arrivals (rise/fall)
+    Vec_Int_t         vTimReqs;    // required (rise/fall)
+    Vec_Int_t         vTimSlews;   // slews (rise/fall)
+    Vec_Int_t         vTimLoads;   // loads (rise/fall)
+    // timing edges
+    Vec_Int_t         vObjOffs;    // object offsets
+    Vec_Int_t         vTimEdges;   // edge timings (rise/fall)
+    // critical path
+    Vec_Int_t         vPath;       // critical path
+};
+
+static inline int * Sfm_TimArr( Sfm_Tim_t * p, Abc_Obj_t * pNode )           { return Vec_IntEntryP( &p->vTimArrs,  Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
+static inline int * Sfm_TimReq( Sfm_Tim_t * p, Abc_Obj_t * pNode )           { return Vec_IntEntryP( &p->vTimReqs,  Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
+static inline int * Sfm_TimSlew( Sfm_Tim_t * p, Abc_Obj_t * pNode )          { return Vec_IntEntryP( &p->vTimSlews, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
+static inline int * Sfm_TimLoad( Sfm_Tim_t * p, Abc_Obj_t * pNode )          { return Vec_IntEntryP( &p->vTimLoads, Abc_Var2Lit(Abc_ObjId(pNode), 0) ); }
+
+static inline int   Sfm_TimArrMax( Sfm_Tim_t * p, Abc_Obj_t * pNode )        { int * a = Sfm_TimArr(p, pNode); return Abc_MaxInt(a[0], a[1]);           }
+static inline void  Sfm_TimSetReq( Sfm_Tim_t * p, Abc_Obj_t * pNode, int t ) { int * r = Sfm_TimReq(p, pNode); r[0] = r[1] = t;                         }
+static inline int   Sfm_TimSlack( Sfm_Tim_t * p, Abc_Obj_t * pNode )         { int * r = Sfm_TimReq(p, pNode), * a = Sfm_TimArr(p, pNode); return Abc_MinInt(r[0]-a[0], r[1]-a[1]); }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Sfm_TimEdgeArrival( Sfm_Tim_t * p, Abc_Obj_t * pNode, int iEdge, Mio_Pin_t * pPin )
+{
+    Mio_PinPhase_t PinPhase = Mio_PinReadPhase(pPin);
+    int tDelayBlockRise = (int)(MIO_NUM*Mio_PinReadDelayBlockRise(pPin));  
+    int tDelayBlockFall = (int)(MIO_NUM*Mio_PinReadDelayBlockFall(pPin));  
+    int * pTimeOut = Sfm_TimArr(p, pNode);
+    int * pTimeIn  = Sfm_TimArr(p, Abc_ObjFanin(pNode, iEdge));
+    if ( PinPhase != MIO_PHASE_INV )  // NONINV phase is present
+    {
+        pTimeOut[0] = Abc_MaxInt( pTimeOut[0], pTimeIn[0] + tDelayBlockRise );
+        pTimeOut[1] = Abc_MaxInt( pTimeOut[1], pTimeIn[1] + tDelayBlockFall );
+    }
+    if ( PinPhase != MIO_PHASE_NONINV )  // INV phase is present
+    {
+        pTimeOut[0] = Abc_MaxInt( pTimeOut[0], pTimeIn[1] + tDelayBlockRise );
+        pTimeOut[1] = Abc_MaxInt( pTimeOut[1], pTimeIn[0] + tDelayBlockFall );
+    }
+}
+void Sfm_TimGateArrival( Sfm_Tim_t * p, Abc_Obj_t * pNode )
+{
+    Mio_Gate_t * pGate = (Mio_Gate_t *)pNode->pData;
+    Mio_Pin_t * pPin;  int i = 0;
+    Mio_GateForEachPin( pGate, pPin )
+        Sfm_TimEdgeArrival( p, pNode, i++, pPin );
+    assert( i == Mio_GateReadPinNum(pGate) );
+}
+
+void Sfm_TimEdgeRequired( Sfm_Tim_t * p, Abc_Obj_t * pNode, int iEdge, Mio_Pin_t * pPin )
+{
+    Mio_PinPhase_t PinPhase = Mio_PinReadPhase(pPin);
+    int tDelayBlockRise = (int)(MIO_NUM*Mio_PinReadDelayBlockRise(pPin));  
+    int tDelayBlockFall = (int)(MIO_NUM*Mio_PinReadDelayBlockFall(pPin));  
+    int * pTimeOut = Sfm_TimReq(p, pNode);
+    int * pTimeIn  = Sfm_TimReq(p, Abc_ObjFanin(pNode, iEdge));
+    if ( PinPhase != MIO_PHASE_INV )  // NONINV phase is present
+    {
+        pTimeIn[0] = Abc_MinInt( pTimeIn[0], pTimeOut[0] - tDelayBlockRise );
+        pTimeIn[1] = Abc_MinInt( pTimeIn[1], pTimeOut[1] - tDelayBlockFall );
+    }
+    if ( PinPhase != MIO_PHASE_NONINV )  // INV phase is present
+    {
+        pTimeIn[0] = Abc_MinInt( pTimeIn[0], pTimeOut[1] - tDelayBlockRise );
+        pTimeIn[1] = Abc_MinInt( pTimeIn[1], pTimeOut[0] - tDelayBlockFall );
+    }
+}
+void Sfm_TimGateRequired( Sfm_Tim_t * p, Abc_Obj_t * pNode )
+{
+    Mio_Gate_t * pGate = (Mio_Gate_t *)pNode->pData;
+    Mio_Pin_t * pPin;  int i = 0;
+    Mio_GateForEachPin( pGate, pPin )
+        Sfm_TimEdgeRequired( p, pNode, i++, pPin );
+    assert( i == Mio_GateReadPinNum(pGate) );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Sfm_TimCriticalPath_int( Sfm_Tim_t * p, Abc_Obj_t * pObj, Vec_Int_t * vPath, int SlackMax )
+{
+    Abc_Obj_t * pNext; int i;
+    if ( Abc_NodeIsTravIdCurrent( pObj ) )
+        return;
+    Abc_NodeSetTravIdCurrent( pObj );
+    assert( Abc_ObjIsNode(pObj) );
+    Abc_ObjForEachFanin( pObj, pNext, i )
+    {
+        if ( Abc_ObjIsCi(pNext) || Abc_ObjFaninNum(pNext) == 0 )
+            continue;
+        assert( Abc_ObjIsNode(pNext) );
+        if ( Sfm_TimSlack(p, pNext) <= SlackMax )
+            Sfm_TimCriticalPath_int( p, pNext, vPath, SlackMax );
+    }
+    if ( Abc_ObjFaninNum(pObj) > 0 )
+        Vec_IntPush( vPath, Abc_ObjId(pObj) );
+}
+int Sfm_TimCriticalPath( Sfm_Tim_t * p, int Window )
+{
+    int i, SlackMax = p->Delay * Window / 100;
+    Abc_Obj_t * pObj, * pNext; 
+    Vec_IntClear( &p->vPath );
+    Abc_NtkIncrementTravId( p->pNtk ); 
+    Abc_NtkForEachCo( p->pNtk, pObj, i )
+    {
+        pNext = Abc_ObjFanin0(pObj);
+        if ( Abc_ObjIsCi(pNext) || Abc_ObjFaninNum(pNext) == 0 )
+            continue;
+        assert( Abc_ObjIsNode(pNext) );
+        if ( Sfm_TimSlack(p, pNext) <= SlackMax )
+            Sfm_TimCriticalPath_int( p, pNext, &p->vPath, SlackMax );
+    }
+    return Vec_IntSize(&p->vPath);
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Sfm_TimTrace( Sfm_Tim_t * p )
+{
+    Abc_Obj_t * pObj; int i, Delay = 0;
+    Vec_Ptr_t * vNodes = Abc_NtkDfs( p->pNtk, 1 );
+    Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
+        Sfm_TimGateArrival( p, pObj );
+    Abc_NtkForEachCo( p->pNtk, pObj, i )
+        Delay = Abc_MaxInt( Delay, Sfm_TimArrMax(p, Abc_ObjFanin0(pObj)) );
+    Abc_NtkForEachCo( p->pNtk, pObj, i )
+        Sfm_TimSetReq( p, Abc_ObjFanin0(pObj), Delay );
+    Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pObj, i )
+        Sfm_TimGateRequired( p, pObj );
+    Vec_PtrFree( vNodes );
+    return Delay;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Sfm_Tim_t * Sfm_TimStart( Mio_Library_t * pLib, Scl_Con_t * pExt, Abc_Ntk_t * pNtk )
+{
+//    Abc_Obj_t * pObj; int i;
+    Sfm_Tim_t * p = ABC_CALLOC( Sfm_Tim_t, 1 );
+    p->pLib = pLib;
+    p->pExt = pExt;
+    p->pNtk = pNtk;
+    Vec_IntFill( &p->vTimArrs,  2*Abc_NtkObjNumMax(pNtk), 0 );
+    Vec_IntFill( &p->vTimReqs,  2*Abc_NtkObjNumMax(pNtk), 0 );
+//    Vec_IntFill( &p->vTimSlews, 2*Abc_NtkObjNumMax(pNtk), 0 );
+//    Vec_IntFill( &p->vTimLoads, 2*Abc_NtkObjNumMax(pNtk), 0 );
+//    Vec_IntFill( &p->vObjOffs,  Abc_NtkObjNumMax(pNtk), 0 );
+//    Abc_NtkForEachNode( pNtk, pObj, i )
+//    {
+//        Vec_IntWriteEntry( &p->vObjOffs, i, Vec_IntSize(Vec_IntSize(&p->vTimEdges)) );
+//        Vec_IntFillExtra( &p->vTimEdges, Vec_IntSize(Vec_IntSize(&p->vTimEdges)) + Abc_ObjFaninNum(pObj), 0 );
+//    }
+    return p;
+}
+void Sfm_TimStop( Sfm_Tim_t * p )
+{
+    Vec_IntErase( &p->vTimArrs );
+    Vec_IntErase( &p->vTimReqs );
+    Vec_IntErase( &p->vTimSlews );
+    Vec_IntErase( &p->vTimLoads );
+    Vec_IntErase( &p->vObjOffs );
+    Vec_IntErase( &p->vTimEdges );
+    Vec_IntErase( &p->vPath );
+    ABC_FREE( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Sfm_TimTest( Abc_Ntk_t * pNtk )
+{
+    Mio_Library_t * pLib = (Mio_Library_t *)pNtk->pManFunc;
+    Sfm_Tim_t * p = Sfm_TimStart( pLib, NULL, pNtk );
+    p->Delay = Sfm_TimTrace( p );
+    printf( "Max delay = %.2f.  Path = %d (%d).\n", MIO_NUMINV*p->Delay, Sfm_TimCriticalPath(p, 1), Abc_NtkNodeNum(p->pNtk) );
+    Sfm_TimStop( p );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+