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f155661151
Co-authored-by: Maurizio Cimadamore <mcimadamore@openjdk.org> Co-authored-by: Christian Hagedorn <chagedorn@openjdk.org> Reviewed-by: chagedorn, thartmann
67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
/*
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* Copyright (c) 2025, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8342692
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* @summary C2: long counted loop/long range checks: don't create loop-nest for short running loops
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* @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:LoopUnrollLimit=100
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* TestShortRunningIntLoopWithLongChecksPredicates
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* @run main/othervm TestShortRunningIntLoopWithLongChecksPredicates
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*/
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import java.util.Objects;
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// int RC is first eliminated by predication which causes Assertion
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// Predicates to be added. Then the loop is transformed to make it
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// possible to optimize long RC. Finally unrolling happen which
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// require the Assertion Predicates to have been properly copied when
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// the loop was transformed for the long range check.
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public class TestShortRunningIntLoopWithLongChecksPredicates {
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private static volatile int volatileField;
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public static void main(String[] args) {
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int[] array = new int[100];
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for (int i = 0; i < 20_000; i++) {
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helper1(100, array, 100);
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test1(1, 100);
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}
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}
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private static void test1(int stop, long range) {
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int[] array = new int[3];
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helper1(stop, array, range);
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}
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private static void helper1(int stop, int[] array, long range) {
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for (int i = 0; i < stop; i++) {
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if (i % 2 == 0) {
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array[i] += i;
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} else {
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volatileField = 42;
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}
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Objects.checkIndex(i, range);
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}
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}
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}
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