src/share/vm/opto/loopUnswitch.cpp

*** 372,385 ****
        tty->print_cr("CountedLoopReserveKit::create_reserve: %d not valid counted loop", cl->_idx);
      }
      return false; // skip malformed counted loop
    }
    if (!cl->is_main_loop()) {
      if (TraceLoopOpts) {
!       tty->print_cr("CountedLoopReserveKit::create_reserve: %d not main loop", cl->_idx);
      }
-     return false; // skip normal, pre, and post loops
    }
  
    _lp = _lpt->_head->as_Loop();
    _lp_reserved = _phase->create_reserve_version_of_loop(_lpt, this);
  
--- 372,392 ----
        tty->print_cr("CountedLoopReserveKit::create_reserve: %d not valid counted loop", cl->_idx);
      }
      return false; // skip malformed counted loop
    }
    if (!cl->is_main_loop()) {
+     bool loop_not_canonical = true;
+     if (cl->is_post_loop() && (cl->slp_max_unroll() > 0)) {
+       loop_not_canonical = false;
+     }
+     // only reject some loop forms
+     if (loop_not_canonical) {
        if (TraceLoopOpts) {
!         tty->print_cr("CountedLoopReserveKit::create_reserve: %d not canonical loop", cl->_idx);
!       }
!       return false; // skip normal, pre, and post (conditionally) loops
      }
    }
  
    _lp = _lpt->_head->as_Loop();
    _lp_reserved = _phase->create_reserve_version_of_loop(_lpt, this);