1 /* 2 * Copyright (c) 2014, 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 /** 26 * @test 27 * @bug 8031321 28 * @summary Verify that results of computations are the same w/ 29 * and w/o usage of intrinsic 30 * @library /testlibrary /testlibrary/whitebox 31 * @build TestTzcntL BMITestRunner Expr 32 * @run main ClassFileInstaller sun.hotspot.WhiteBox 33 * sun.hotspot.WhiteBox$WhiteBoxPermission 34 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 35 * -XX:+WhiteBoxAPI TestTzcntL 36 */ 37 38 import sun.hotspot.cpuinfo.CPUInfo; 39 40 public class TestTzcntL { 41 42 public static void main(String args[]) throws Throwable { 43 if (!CPUInfo.hasFeature("bmi1")) { 44 System.out.println("CPU does not support bmi1 feature. " + 45 "Test skipped."); 46 return; 47 } 48 49 BMITestRunner.runTests(TzcntLExpr.class, args, 50 "-XX:+UseCountTrailingZerosInstruction"); 51 } 52 53 public static class TzcntLExpr extends Expr.BitCountingLongExpr { 54 55 public long longExpr(long src) { 56 return Long.numberOfTrailingZeros(src); 57 } 58 59 } 60 61 }