src/hotspot/share/opto/castnode.cpp

*** 460,469 ****
--- 460,486 ----
    if (t == Type::TOP) return Type::TOP;
    if (t->base() == Type::RawPtr && t->singleton()) {
      uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con();
      return TypeX::make(bits);
    }
+ 
+   PhaseIterGVN* igvn = phase->is_IterGVN();
+   if (igvn != NULL && (t->is_zero_type() || !TypePtr::NULL_PTR->higher_equal(t))) {
+     for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
+       Node* u = fast_out(i);
+       if (u->Opcode() == Op_OrL) {
+         for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
+           Node* cmp = u->fast_out(j);
+           if (cmp->Opcode() == Op_CmpL) {
+             // Give CmpL a chance to get optimized
+             igvn->_worklist.push(cmp);
+           }
+         }
+       }
+     }
+   }
+ 
    return CastP2XNode::bottom_type();
  }
  
  Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) {
    return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL;