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8240795: [REDO] 8238384 CTW: C2 compilation fails with "assert(store …
…!= load->find_exact_control(load->in(0))) failed: dependence cycle found" Reviewed-by: kvn, thartmann
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52
test/hotspot/jtreg/compiler/escapeAnalysis/TestCopyOfBrokenAntiDependency.java
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/* | ||
* Copyright (c) 2020, Red Hat, Inc. 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. | ||
*/ | ||
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/** | ||
* @test | ||
* @bug 8238384 | ||
* @summary CTW: C2 compilation fails with "assert(store != load->find_exact_control(load->in(0))) failed: dependence cycle found" | ||
* | ||
* @run main/othervm -XX:-BackgroundCompilation TestCopyOfBrokenAntiDependency | ||
* | ||
*/ | ||
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import java.util.Arrays; | ||
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public class TestCopyOfBrokenAntiDependency { | ||
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public static void main(String[] args) { | ||
for (int i = 0; i < 20_000; i++) { | ||
test(100); | ||
} | ||
} | ||
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private static Object test(int length) { | ||
Object[] src = new Object[length]; // non escaping | ||
final Object[] dst = Arrays.copyOf(src, 10); // can't be removed | ||
final Object[] dst2 = Arrays.copyOf(dst, 100); | ||
// load is control dependent on membar from previous copyOf | ||
// but has memory edge to first copyOf. | ||
final Object v = dst[0]; | ||
return v; | ||
} | ||
} |