src/share/vm/opto/ifg.cpp

*** 69,79 ****
  // Add an edge between 'a' and everything in the vector.
  void PhaseIFG::add_vector( uint a, IndexSet *vec ) {
    // IFG is triangular, so do the inserts where 'a' < 'b'.
    assert( !_is_square, "only on triangular" );
    IndexSet *adjs_a = &_adjs[a];
!   if( !vec->count() ) return;
  
    IndexSetIterator elements(vec);
    uint neighbor;
    while ((neighbor = elements.next()) != 0) {
      add_edge( a, neighbor );
--- 69,79 ----
  // Add an edge between 'a' and everything in the vector.
  void PhaseIFG::add_vector( uint a, IndexSet *vec ) {
    // IFG is triangular, so do the inserts where 'a' < 'b'.
    assert( !_is_square, "only on triangular" );
    IndexSet *adjs_a = &_adjs[a];
!   if( vec->is_empty() ) return;
  
    IndexSetIterator elements(vec);
    uint neighbor;
    while ((neighbor = elements.next()) != 0) {
      add_edge( a, neighbor );