| /* |
| * Copyright (c) 2015 SAP SE. All rights reserved. |
| * Copyright (c) 2016, Red Hat, Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8080190 |
| * @bug 8154537 |
| * @key regression |
| * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f |
| * |
| * @run main/othervm -Xbatch -XX:-UseOnStackReplacement compiler.codegen.IntRotateWithImmediate |
| * @author volker.simonis@gmail.com |
| */ |
| |
| package compiler.codegen; |
| |
| public class IntRotateWithImmediate { |
| |
| // This is currently the same as Integer.rotateRight() |
| static int rotateRight1(int i, int distance) { |
| // On some architectures (i.e. x86_64 and ppc64) the following computation is |
| // matched in the .ad file into a single MachNode which emmits a single rotate |
| // machine instruction. It is important that the shift amount is masked to match |
| // corresponding immediate width in the native instruction. On x86_64 the rotate |
| // left instruction ('rol') encodes an 8-bit immediate while the corresponding |
| // 'rotlwi' instruction on Power only encodes a 5-bit immediate. |
| return ((i >>> distance) | (i << -distance)); |
| } |
| |
| static int rotateRight2(int i, int distance) { |
| return ((i >>> distance) | (i << (32 - distance))); |
| } |
| |
| static int compute1(int x) { |
| return rotateRight1(x, 3); |
| } |
| |
| static int compute2(int x) { |
| return rotateRight2(x, 3); |
| } |
| |
| public static void main(String args[]) { |
| int val = 4096; |
| |
| int firstResult = compute1(val); |
| |
| for (int i = 0; i < 100000; i++) { |
| int newResult = compute1(val); |
| if (firstResult != newResult) { |
| throw new InternalError(firstResult + " != " + newResult); |
| } |
| newResult = compute2(val); |
| if (firstResult != newResult) { |
| throw new InternalError(firstResult + " != " + newResult); |
| } |
| } |
| System.out.println("OK"); |
| } |
| |
| } |