< prev index next >

test/compiler/codegen/IntRotateWithImmediate.java

Print this page


   1 /*
   2  * Copyright 2015 SAP AG.  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  * @test
  26  * @bug 8080190

  27  * @key regression
  28  * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f
  29  * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate
  30  * @author volker.simonis@gmail.com
  31  */
  32 
  33 public class IntRotateWithImmediate {
  34 
  35   // This is currently the same as Integer.rotateRight()
  36   static int rotateRight(int i, int distance) {
  37     // On some architectures (i.e. x86_64 and ppc64) the following computation is
  38     // matched in the .ad file into a single MachNode which emmits a single rotate
  39     // machine instruction. It is important that the shift amount is masked to match
  40     // corresponding immediate width in the native instruction. On x86_64 the rotate
  41     // left instruction ('rol') encodes an 8-bit immediate while the corresponding
  42     // 'rotlwi' instruction on Power only encodes a 5-bit immediate.
  43     return ((i >>> distance) | (i << -distance));
  44   }
  45 
  46   static int compute(int x) {
  47     return rotateRight(x, 3);








  48   }
  49 
  50   public static void main(String args[]) {
  51     int val = 4096;
  52 
  53     int firstResult = compute(val);
  54 
  55     for (int i = 0; i < 100000; i++) {
  56       int newResult = compute(val);




  57       if (firstResult != newResult) {
  58         throw new InternalError(firstResult + " != " + newResult);
  59       }
  60     }
  61     System.out.println("OK");
  62   }
  63 
  64 }
   1 /*
   2  * Copyright 2015 SAP AG.  All Rights Reserved.
   3  * Copyright (c) 2016, Red Hat, Inc. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 /*
  26  * @test
  27  * @bug 8080190
  28  * @bug 8154537
  29  * @key regression
  30  * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f
  31  * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate
  32  * @author volker.simonis@gmail.com
  33  */
  34 
  35 public class IntRotateWithImmediate {
  36 
  37   // This is currently the same as Integer.rotateRight()
  38   static int rotateRight1(int i, int distance) {
  39     // On some architectures (i.e. x86_64 and ppc64) the following computation is
  40     // matched in the .ad file into a single MachNode which emmits a single rotate
  41     // machine instruction. It is important that the shift amount is masked to match
  42     // corresponding immediate width in the native instruction. On x86_64 the rotate
  43     // left instruction ('rol') encodes an 8-bit immediate while the corresponding
  44     // 'rotlwi' instruction on Power only encodes a 5-bit immediate.
  45     return ((i >>> distance) | (i << -distance));
  46   }
  47 
  48   static int rotateRight2(int i, int distance) {
  49       return ((i >>> distance) | (i << (32-distance)));
  50   }
  51 
  52   static int compute1(int x) {
  53     return rotateRight1(x, 3);
  54   }
  55 
  56   static int compute2(int x) {
  57     return rotateRight2(x, 3);
  58   }
  59 
  60   public static void main(String args[]) {
  61     int val = 4096;
  62 
  63     int firstResult = compute1(val);
  64 
  65     for (int i = 0; i < 100000; i++) {
  66       int newResult = compute1(val);
  67       if (firstResult != newResult) {
  68         throw new InternalError(firstResult + " != " + newResult);
  69       }
  70       newResult = compute2(val);
  71       if (firstResult != newResult) {
  72         throw new InternalError(firstResult + " != " + newResult);
  73       }
  74     }
  75     System.out.println("OK");
  76   }
  77 
  78 }
< prev index next >