| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. 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 8160425 |
| * @summary Test vectorization with a signalling NaN. |
| * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-OptimizeFill |
| * compiler.vectorization.TestNaNVector |
| * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-OptimizeFill |
| * -XX:MaxVectorSize=4 compiler.vectorization.TestNaNVector |
| */ |
| |
| package compiler.vectorization; |
| |
| public class TestNaNVector { |
| private char[] array; |
| private static final int LEN = 1024; |
| |
| public static void main(String args[]) { |
| TestNaNVector test = new TestNaNVector(); |
| // Check double precision NaN |
| for (int i = 0; i < 10_000; ++i) { |
| test.vectorizeNaNDP(); |
| } |
| System.out.println("Checking double precision Nan"); |
| test.checkResult(0xfff7); |
| |
| // Check single precision NaN |
| for (int i = 0; i < 10_000; ++i) { |
| test.vectorizeNaNSP(); |
| } |
| System.out.println("Checking single precision Nan"); |
| test.checkResult(0xff80); |
| } |
| |
| public TestNaNVector() { |
| array = new char[LEN]; |
| } |
| |
| public void vectorizeNaNDP() { |
| // This loop will be vectorized and the array store will be replaced by |
| // a 64-bit vector store to four subsequent array elements. The vector |
| // should look like this '0xfff7fff7fff7fff7' and is read from the constant |
| // table. However, in floating point arithmetic this is a signalling NaN |
| // which may be converted to a quiet NaN when processed by the x87 FPU. |
| // If the signalling bit is set, the vector ends up in the constant table |
| // as '0xfffffff7fff7fff7' which leads to an incorrect result. |
| for (int i = 0; i < LEN; ++i) { |
| array[i] = 0xfff7; |
| } |
| } |
| |
| public void vectorizeNaNSP() { |
| // Same as above but with single precision |
| for (int i = 0; i < LEN; ++i) { |
| array[i] = 0xff80; |
| } |
| } |
| |
| public void checkResult(int expected) { |
| for (int i = 0; i < LEN; ++i) { |
| if (array[i] != expected) { |
| throw new RuntimeException("Invalid result: array[" + i + "] = " + (int)array[i] + " != " + expected); |
| } |
| } |
| } |
| } |
| |