--- /dev/null 2019-03-13 09:49:36.000000000 +0100 +++ new/test/hotspot/jtreg/compiler/loopstripmining/CheckLoopStripMining.java 2019-03-13 09:49:31.000000000 +0100 @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2019, SAP SE. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/** + * @test + * @bug 8220374 + * @summary C2: LoopStripMining doesn't strip as expected + * @requires vm.compiler2.enabled + * + * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+SafepointTimeout -XX:+SafepointALot -XX:+AbortVMOnSafepointTimeout -XX:SafepointTimeoutDelay=500 -XX:GuaranteedSafepointInterval=500 -XX:-TieredCompilation -XX:+UseCountedLoopSafepoints -XX:LoopStripMiningIter=1000 -XX:LoopUnrollLimit=0 -XX:CompileCommand=compileonly,CheckLoopStripMining::test_loop -Xcomp CheckLoopStripMining + * + */ + +public class CheckLoopStripMining { + + public static int test_loop(int x) { + int sum = 0; + if (x != 0) { + for (int y = 1; y < Integer.MAX_VALUE; ++y) { + if (y % x == 0) ++sum; + } + } + return sum; + } + + public static void main(String args[]) { + int sum = test_loop(3); + System.out.println("sum: " + sum); + } +}