1 /*
   2  * Copyright (c) 2014, 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  *
  23  */
  24 
  25 /**
  26  * @test
  27  * @bug 8031321
  28  * @summary Verify that results of computations are the same w/
  29  *          and w/o usage of BLSMSK instruction
  30  * @library /testlibrary /testlibrary/whitebox
  31  * @build TestBlsmskI BMITestRunner Expr
  32  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  33  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  34  *                   -XX:+WhiteBoxAPI TestBlsmskI
  35  */
  36 
  37 import sun.hotspot.cpuinfo.CPUInfo;
  38 
  39 public class TestBlsmskI {
  40 
  41     public static void main(String args[]) throws Throwable {
  42         if (!CPUInfo.hasFeature("bmi1")) {
  43             System.out.println("CPU does not support bmi1 feature. " +
  44                                "Test skipped.");
  45             return;
  46         }
  47 
  48         BMITestRunner.runTests(BlsmskIExpr.class, args,
  49                                "-XX:+UseBMI1Instructions");
  50         BMITestRunner.runTests(BlsmskICommutativeExpr.class, args,
  51                                "-XX:+UseBMI1Instructions");
  52     }
  53 
  54     public static class BlsmskIExpr extends Expr.BMIUnaryIntExpr {
  55 
  56         public int intExpr(int src) {
  57             return (src - 1) ^ src;
  58         }
  59 
  60         public int intExpr(Expr.MemI src) {
  61             return (src.value - 1) ^ src.value;
  62         }
  63 
  64     }
  65 
  66     public static class BlsmskICommutativeExpr extends Expr.BMIUnaryIntExpr {
  67 
  68         public int intExpr(int src) {
  69             return src ^ (src - 1);
  70         }
  71 
  72         public int intExpr(Expr.MemI src) {
  73             return src.value ^ (src.value - 1);
  74         }
  75 
  76     }
  77 
  78 }