83 lines
3.4 KiB
Java
83 lines
3.4 KiB
Java
/*
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* Copyright (c) 2020, 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 8257182
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* @requires vm.compiler2.enabled
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* @summary Test RotateLeftNode and RotateRightNode with negative even numbers which produces a wrong result due to
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* applying an arithemtic instead of a logical shift.
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* @run main/othervm -XX:CompileCommand=compileonly,compiler.c2.TestRotateNegativeEvenValues::run
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* -XX:CompileCommand=inline,compiler.c2.TestRotateNegativeEvenValues::test
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* -Xcomp -XX:-TieredCompilation compiler.c2.TestRotateNegativeEvenValues
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*/
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package compiler.c2;
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public class TestRotateNegativeEvenValues {
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public static void run() {
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test(1 << 31); // INT_MIN
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test(1L << 63); // LONG_MIN
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test(-1 << 10); // -1024
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test(-1L << 10); // -1024
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test(-1 << 20); // -1048576
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test(-1L << 20); // -1048576
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test(-2); // 111...10
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test(-2L); // 111...10
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test(-3546); // Random minus even number
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test(-3546L); // Random minus even number
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}
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// Inlined such that negativeEvenNumber is a constant
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public static void test(int negativeEvenNumber) {
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for (int i = 1; i <= 1; i++) {
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int leftShift = negativeEvenNumber << -i;
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int rightShift = negativeEvenNumber >>> i;
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if ((leftShift | rightShift) != (rightShift | leftShift)) {
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int or1 = leftShift | rightShift;
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int or2 = rightShift | leftShift;
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throw new RuntimeException("Or operations are not equal:" + " " + or1 + " vs. "+ or2
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+ " - leftShift: " + leftShift + ", rightShift: " + rightShift);
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}
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}
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}
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// Inlined such that negativeEvenNumber is a constant
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public static void test(long negativeEvenNumber) {
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for (int i = 1; i <= 1; i++) {
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long leftShift = negativeEvenNumber << -i;
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long rightShift = negativeEvenNumber >>> i;
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if ((leftShift | rightShift) != (rightShift | leftShift)) {
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long or1 = leftShift | rightShift;
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long or2 = rightShift | leftShift;
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throw new RuntimeException("Or operations are not equal:" + " " + or1 + " vs. "+ or2
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+ " - leftShift: " + leftShift + ", rightShift: " + rightShift);
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}
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}
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}
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public static void main(String argv[]) {
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run();
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}
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}
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