jdk8-mips64-public/hotspot: test/compiler/c1/MultiplyByMaxInt.java@a6f289d66efe

8181872: C1: possible overflow when strength reducing integer multiply by constant
Reviewed-by: kvn, andrew

     1 /*

     2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /*

    25  * @test

    26  * @bug 8181872

    27  *

    28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions

    29  *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=1

    30  *                   -XX:-BackgroundCompilation -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test

    31  *                   compiler.c1.MultiplyByMaxInt

    32  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-BackgroundCompilation

    33  *                   -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=3

    34  *                   -XX:CompileCommand=dontinline,compiler.c1.MultiplyByMaxInt::test

    35  *                   compiler.c1.MultiplyByMaxInt

    36  */

    37 package compiler.c1;

    39 public class MultiplyByMaxInt {

    40     static int test(int x) {

    41         int loops = (x >>> 4) & 7;

    42         while (loops-- > 0) {

    43             x = (x * 2147483647) % 16807;

    44         }

    45         return x;

    46     }

    48     public static void main(String[] args) {

    49         for (int i = 0; i < 20000; i++) {

    50             test(i);

    51         }

    52     }

    53 }

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