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