src/share/vm/opto/superword.cpp

*** 2245,2255 ****
--- 2245,2258 ----
        uint slp_max_unroll_factor = cl->slp_max_unroll();
        if (slp_max_unroll_factor == max_vlen) {
          NOT_PRODUCT(if (TraceSuperWordLoopUnrollAnalysis) tty->print_cr("vector loop(unroll=%d, len=%d)\n", max_vlen, max_vlen_in_bytes*BitsPerByte));
          // For atomic unrolled loops which are vector mapped, instigate more unrolling.
          cl->set_notpassed_slp();
+         // if vector resources are limited, do not allow additional unrolling
+         if (FLOATPRESSURE > 8) {
            C->set_major_progress();
+         }
          cl->mark_do_unroll_only();
        }
      }
    }