1 /* 2 * Copyright (c) 2014, 2016, 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 * @test 26 * @bug 8031321 27 * @summary Verify that results of computations are the same w/ 28 * and w/o usage of intrinsic 29 * @library /test/lib / 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 * 33 * @build sun.hotspot.WhiteBox 34 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 35 * sun.hotspot.WhiteBox$WhiteBoxPermission 36 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 37 * -XX:+WhiteBoxAPI 38 * compiler.intrinsics.bmi.TestLzcntI 39 */ 40 41 package compiler.intrinsics.bmi; 42 43 import sun.hotspot.cpuinfo.CPUInfo; 44 45 public class TestLzcntI { 46 47 public static void main(String args[]) throws Throwable { 48 /* 49 * SPARC also has lzcnt if it has the VIS3 instruction set. 50 */ 51 if (!(CPUInfo.hasFeature("lzcnt") || CPUInfo.hasFeature("vis3"))) { 52 System.out.println("INFO: CPU does not support lzcnt feature."); 53 } 54 55 BMITestRunner.runTests(LzcntIExpr.class, args, 56 "-XX:+IgnoreUnrecognizedVMOptions", 57 "-XX:+UseCountLeadingZerosInstruction"); 58 } 59 60 public static class LzcntIExpr extends Expr.BitCountingIntExpr { 61 62 public int intExpr(int src) { 63 return Integer.numberOfLeadingZeros(src); 64 } 65 66 } 67 68 }