1 /* 2 * Copyright (c) 2019, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8229483 27 * @summary Sinking load out of loop may trigger: assert(found_sfpt) failed: no node in loop that's not input to safepoint 28 * 29 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:LoopMaxUnroll=0 AntiDependentLoadInOuterStripMinedLoop 30 * 31 */ 32 33 public class AntiDependentLoadInOuterStripMinedLoop { 34 private static int field; 35 private static int field2; 36 private static volatile int barrier; 37 38 public static void main(String[] args) { 39 int[] array = new int[1]; 40 for (int i = 0; i < 20_000; i++) { 41 test(array); 42 } 43 } 44 45 private static int test(int[] array) { 46 int res = 1; 47 48 for (int i = 0; i < 10; i++) { 49 barrier = 1; 50 // field load doesn't float higher than here 51 52 for (int j = 0; j < 2000; j++) { 53 array[0] = j; // seen as anti dependence by C2 during loop opts, sunk out of loop 54 res *= j; 55 } 56 } 57 58 return field + res + field * 2; 59 } 60 }