Fixing Liberty parser to handle 'scalar' delay/slew tables.

src/map/scl/sclLib.h

@@ -484,6 +484,15 @@ static inline float Scl_LibLookup( SC_Surface * p, float slew, float load )
     float sfrac, lfrac, p0, p1;
     int s, l;
 
+    // handle constant table
+    if ( Vec_FltSize(p->vIndex0) == 1 && Vec_FltSize(p->vIndex1) == 1 )
+    {
+        Vec_Flt_t * vTemp = (Vec_Flt_t *)Vec_PtrEntry(p->vData, 0);
+        assert( Vec_PtrSize(p->vData) == 1 );
+        assert( Vec_FltSize(vTemp) == 1 );
+        return Vec_FltEntry(vTemp, 0);
+    }
+
     // Find closest sample points in surface:
     pIndex0 = Vec_FltArray(p->vIndex0);
     for ( s = 1; s < Vec_FltSize(p->vIndex0)-1; s++ )

src/map/scl/sclLibUtil.c

@@ -353,6 +353,13 @@ int Abc_SclComputeParametersPin( SC_Lib * p, SC_Cell * pCell, int iPin, float Sl
     Vec_Flt_t * vIndex = pTime ? pTime->pCellRise->vIndex1 : NULL; // capacitance
     if ( vIndex == NULL )
         return 0;
+    // handle constant table
+    if ( Vec_FltSize(vIndex) == 1 )
+    {
+        *pLD = 0;
+        *pPD = Vec_FltEntry( (Vec_Flt_t *)Vec_PtrEntry(pTime->pCellRise->vData, 0), 0 );
+        return 1;
+    }
     // get load points
     Load0.rise = Load0.fall = 0.0;
     Load1.rise = Load1.fall = Vec_FltEntry( vIndex, 0 );

src/map/scl/sclLiberty.c

@@ -1030,6 +1030,23 @@ int Scl_LibertyScanTable( Scl_Tree_t * p, Vec_Ptr_t * vOut, Scl_Item_t * pTiming
         Vec_PtrPush( vOut, vInd2 );
         Vec_PtrPush( vOut, vValues );
     }
+    else if ( !strcmp(pTempl, "scalar") )
+    {
+        Scl_ItemForEachChild( p, pTable, pItem )
+            if ( !Scl_LibertyCompare(p, pItem->Key, "values") )
+            {
+                assert(vValues == NULL);
+                vValues = Scl_LibertyReadFloatVec( Scl_LibertyReadString(p, pItem->Head) );
+                assert( Vec_FltSize(vValues) == 1 );
+                // write entries
+                Vec_PtrPush( vOut, Vec_IntStart(1) );
+                Vec_PtrPush( vOut, Vec_IntStart(1) );
+                Vec_PtrPush( vOut, vValues );
+                break;
+            }
+            else
+            { printf( "Cannot read \"scalar\" template\n" ); return 0; }
+    }
     else
     {
         // fetch the template