findOwnerOfGhost optimization and refactor

amgprec/impl/aggregator/findOwnerOfGhost.cpp

@@ -1,48 +1,29 @@
 #include "MatchBoxPC.h"
 
-
-//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;
-  else
-    Start = myRank;
-#endif
-
-  while ( Start <= End ) {
     Current = (End + Start) / 2;
     // CASE-1:
-    if ( mVerDistance[Current] == vtxIndex ) {
+    if (mVerDistance[Current] == vtxIndex) return Current;
-      while ( mVerDistance[Current+1] == vtxIndex ) {
+    else // CASE 2:
-	Current++;
-	if ( Current == numProcs )
-	  return (-1);
-      }
-      return (Current);
-    }
-    else { //CASE 2:
       if (mVerDistance[Current] > vtxIndex)
         End = Current - 1;
       else // CASE 3:
         Start = Current + 1;
-    }
   } // End of While()
-  if ( Current == 0 )
+
-    return (Current);
-  else {
  if (mVerDistance[Current] > vtxIndex)
       return (Current - 1);
-    else
+
-      return (Current);
+  return Current;
-  } //End of else
-  return (-1); //It should not reach here!
 } // End of findOwnerOfGhost()