60 lines
2.1 KiB
Java
60 lines
2.1 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. 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 8258272
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* @summary Test that LoadVectorMaskedNodes works when the source array is known to only contain zeros
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*
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* @run main/othervm -XX:-BackgroundCompilation -XX:CompileCommand=dontinline,*::testArrayCopy*
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* compiler.arraycopy.TestArrayCopyMaskedWithZeroSrc
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*/
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package compiler.arraycopy;
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import java.util.*;
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public class TestArrayCopyMaskedWithZeroSrc {
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public static void main(String[] args) {
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TestArrayCopyMaskedWithZeroSrc t = new TestArrayCopyMaskedWithZeroSrc();
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t.test();
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}
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void test() {
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for (int i = 0; i < 20000; i++) {
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testArrayCopy1(3);
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}
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}
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// src is allocated locally - it is known it only contains zeros.
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// The copy of will exapnd into LoadVectorMasked on AVX512 machines
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// LoadNode::value will try to replace the load from src with a zero constant.
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byte [] testArrayCopy1(int partial_len) {
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byte [] src = new byte[5];
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byte [] dest = Arrays.copyOf(src, partial_len);
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return dest;
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}
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}
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