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annotate test/compiler/codegen/IntRotateWithImmediate.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 37a5a1341478
children
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1 /*
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2 * Copyright 2015 SAP AG. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
37a5a1341478 8080190: PPC64: Fix wrong rotate instructions in the .ad file
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
37a5a1341478 8080190: PPC64: Fix wrong rotate instructions in the .ad file
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
37a5a1341478 8080190: PPC64: Fix wrong rotate instructions in the .ad file
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 8080190
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27 * @key regression
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28 * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f
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29 * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate
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30 * @author volker.simonis@gmail.com
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31 */
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32
37a5a1341478 8080190: PPC64: Fix wrong rotate instructions in the .ad file
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33 public class IntRotateWithImmediate {
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34
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35 // This is currently the same as Integer.rotateRight()
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36 static int rotateRight(int i, int distance) {
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37 // On some architectures (i.e. x86_64 and ppc64) the following computation is
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38 // matched in the .ad file into a single MachNode which emmits a single rotate
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39 // machine instruction. It is important that the shift amount is masked to match
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40 // corresponding immediate width in the native instruction. On x86_64 the rotate
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41 // left instruction ('rol') encodes an 8-bit immediate while the corresponding
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42 // 'rotlwi' instruction on Power only encodes a 5-bit immediate.
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43 return ((i >>> distance) | (i << -distance));
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44 }
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45
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46 static int compute(int x) {
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47 return rotateRight(x, 3);
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48 }
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49
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50 public static void main(String args[]) {
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51 int val = 4096;
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52
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53 int firstResult = compute(val);
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54
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55 for (int i = 0; i < 100000; i++) {
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56 int newResult = compute(val);
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57 if (firstResult != newResult) {
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58 throw new InternalError(firstResult + " != " + newResult);
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59 }
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60 }
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61 System.out.println("OK");
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62 }
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63
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64 }