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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
83 lines
3.0 KiB
Java
83 lines
3.0 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:LoopMaxUnroll=0
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* -XX:-UseLoopPredicate -XX:-RangeCheckElimination TestShortRunningLongCountedLoopScaleOverflow
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* @run main/othervm TestShortRunningLongCountedLoopScaleOverflow
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*/
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import java.util.Objects;
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// When scale is large, even if loop is short running having a single
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// counted loop is not possible.
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public class TestShortRunningLongCountedLoopScaleOverflow {
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public static void main(String[] args) {
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for (int i = 0; i < 20_000; i++) {
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test1(Integer.MAX_VALUE, 0);
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test2(Integer.MAX_VALUE, 0, 100);
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}
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boolean exception = false;
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try {
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test1(Integer.MAX_VALUE, 10);
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} catch (IndexOutOfBoundsException indexOutOfBoundsException) {
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exception = true;
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}
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if (!exception) {
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throw new RuntimeException("Expected exception not thrown");
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}
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exception = false;
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try {
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test2(Integer.MAX_VALUE, 10, 100);
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} catch (IndexOutOfBoundsException indexOutOfBoundsException) {
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exception = true;
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}
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if (!exception) {
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throw new RuntimeException("Expected exception not thrown");
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}
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}
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static final long veryLargeScale = 1 << 29;
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private static void test1(long range, long j) {
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Objects.checkIndex(0, range);
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for (long i = 0; i < 100; i++) {
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if (i == j) {
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Objects.checkIndex(veryLargeScale * i, range);
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}
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}
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}
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private static void test2(long range, long j, long stop) {
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Objects.checkIndex(0, range);
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for (long i = 0; i < stop; i++) {
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if (i == j) {
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Objects.checkIndex(veryLargeScale * i, range);
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}
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}
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}
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}
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