findOwnerOfGhost optimization and refactor

amgprec/impl/aggregator/findOwnerOfGhost.cpp

@@ -1,48 +1,29 @@
 #include "MatchBoxPC.h"
 
-
+/// Find the owner of a ghost node:
-//TODO parallelize this
-///Find the owner of a ghost node:
 MilanInt findOwnerOfGhost(MilanLongInt vtxIndex, MilanLongInt *mVerDistance,
-                                     MilanInt myRank, MilanInt numProcs) {
+                          MilanInt myRank, MilanInt numProcs)
+{
 
   MilanLongInt mStartInd = mVerDistance[myRank];
   MilanInt Start = 0;
   MilanInt End = numProcs;
   MilanInt Current = 0;
 
-#if 0
+  while (Start <= End)
-  if ( vtxIndex < mStartInd )
+  {
-    End = myRank;
+    Current = (End + Start) / 2;
-  else
+    // CASE-1:
-    Start = myRank;
+    if (mVerDistance[Current] == vtxIndex) return Current;
-#endif
+    else // CASE 2:
-
+      if (mVerDistance[Current] > vtxIndex)
-  while ( Start <= End ) {
-    Current = (End + Start)/2;
-    //CASE-1:
-    if ( mVerDistance[Current] == vtxIndex ) {
-      while ( mVerDistance[Current+1] == vtxIndex ) {
-	Current++;
-	if ( Current == numProcs )
-	  return (-1);
-      }
-      return (Current);
-    }
-    else { //CASE 2:
-      if ( mVerDistance[Current] > vtxIndex )
         End = Current - 1;
-      else //CASE 3:
+      else // CASE 3:
         Start = Current + 1;
-    }
+  } // End of While()
-  } //End of While()
+
-  if ( Current == 0 )
+ if (mVerDistance[Current] > vtxIndex)
-    return (Current);
+      return (Current - 1);
-  else {
+
-    if ( mVerDistance[Current] > vtxIndex )
+  return Current;
-      return (Current-1);
+} // End of findOwnerOfGhost()
-    else
-      return (Current);
-  } //End of else
-  return (-1); //It should not reach here!
-} //End of findOwnerOfGhost()