| /* |
| * Copyright (c) 2015, 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. |
| * |
| */ |
| |
| import com.oracle.java.testlibrary.*; |
| import sun.misc.Unsafe; |
| |
| /** |
| * @test |
| * @bug 8078497 |
| * @summary Tests correct alignment of vectors with loop invariant offset. |
| * @library /testlibrary |
| * @run main TestVectorizationWithInvariant |
| */ |
| public class TestVectorizationWithInvariant { |
| |
| private static Unsafe unsafe; |
| private static final long BYTE_ARRAY_OFFSET; |
| private static final long CHAR_ARRAY_OFFSET; |
| |
| static { |
| unsafe = Utils.getUnsafe(); |
| BYTE_ARRAY_OFFSET = unsafe.arrayBaseOffset(byte[].class); |
| CHAR_ARRAY_OFFSET = unsafe.arrayBaseOffset(char[].class); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| byte[] byte_array1 = new byte[1000]; |
| byte[] byte_array2 = new byte[1000]; |
| char[] char_array = new char[1000]; |
| |
| for (int i = 0; i < 20_000; ++i) { |
| copyByteToChar(byte_array1, byte_array2, char_array, 1); |
| copyCharToByte(char_array, byte_array1, 1); |
| copyCharToByteAligned(char_array, byte_array1); |
| copyCharToByteUnaligned(char_array, byte_array1); |
| } |
| } |
| |
| /* |
| * Copy multiple consecutive chars from a byte array to a given offset in a char array |
| * to trigger C2's superword optimization. The offset in the byte array is independent |
| * of the loop induction variable and can be set to an arbitrary value. It may then not |
| * be possible to both align the LoadUS and the StoreC operations. Therefore, vectorization |
| * should only be done in this case if unaligned memory accesses are allowed. |
| */ |
| public static void copyByteToChar(byte[] src1, byte[] src2, char[] dst, int off) { |
| off = (int) BYTE_ARRAY_OFFSET + (off << 1); |
| byte[] src = src1; |
| for (int i = (int) CHAR_ARRAY_OFFSET; i < 100; i = i + 8) { |
| // Copy 8 chars from src to dst |
| unsafe.putChar(dst, i + 0, unsafe.getChar(src, off + 0)); |
| unsafe.putChar(dst, i + 2, unsafe.getChar(src, off + 2)); |
| unsafe.putChar(dst, i + 4, unsafe.getChar(src, off + 4)); |
| unsafe.putChar(dst, i + 6, unsafe.getChar(src, off + 6)); |
| unsafe.putChar(dst, i + 8, unsafe.getChar(src, off + 8)); |
| unsafe.putChar(dst, i + 10, unsafe.getChar(src, off + 10)); |
| unsafe.putChar(dst, i + 12, unsafe.getChar(src, off + 12)); |
| unsafe.putChar(dst, i + 14, unsafe.getChar(src, off + 14)); |
| |
| // Prevent loop invariant code motion of char read. |
| src = (src == src1) ? src2 : src1; |
| } |
| } |
| |
| /* |
| * Copy multiple consecutive chars from a char array to a given offset in a byte array |
| * to trigger C2's superword optimization. Checks for similar problems as 'copyByteToChar'. |
| */ |
| public static void copyCharToByte(char[] src, byte[] dst, int off) { |
| off = (int) BYTE_ARRAY_OFFSET + (off << 1); |
| for (int i = 0; i < 100; i = i + 8) { |
| // Copy 8 chars from src to dst |
| unsafe.putChar(dst, off + 0, src[i + 0]); |
| unsafe.putChar(dst, off + 2, src[i + 1]); |
| unsafe.putChar(dst, off + 4, src[i + 2]); |
| unsafe.putChar(dst, off + 6, src[i + 3]); |
| unsafe.putChar(dst, off + 8, src[i + 4]); |
| unsafe.putChar(dst, off + 10, src[i + 5]); |
| unsafe.putChar(dst, off + 12, src[i + 6]); |
| unsafe.putChar(dst, off + 14, src[i + 7]); |
| } |
| } |
| |
| /* |
| * Variant of copyCharToByte with a constant destination array offset. |
| * The loop should always be vectorized because both the LoadUS and StoreC |
| * operations can be aligned. |
| */ |
| public static void copyCharToByteAligned(char[] src, byte[] dst) { |
| final int off = (int) BYTE_ARRAY_OFFSET; |
| for (int i = 8; i < 100; i = i + 8) { |
| // Copy 8 chars from src to dst |
| unsafe.putChar(dst, off + 0, src[i + 0]); |
| unsafe.putChar(dst, off + 2, src[i + 1]); |
| unsafe.putChar(dst, off + 4, src[i + 2]); |
| unsafe.putChar(dst, off + 6, src[i + 3]); |
| unsafe.putChar(dst, off + 8, src[i + 4]); |
| unsafe.putChar(dst, off + 10, src[i + 5]); |
| unsafe.putChar(dst, off + 12, src[i + 6]); |
| unsafe.putChar(dst, off + 14, src[i + 7]); |
| } |
| } |
| |
| /* |
| * Variant of copyCharToByte with a constant destination array offset. The |
| * loop should only be vectorized if unaligned memory operations are allowed |
| * because not both the LoadUS and the StoreC can be aligned. |
| */ |
| public static void copyCharToByteUnaligned(char[] src, byte[] dst) { |
| final int off = (int) BYTE_ARRAY_OFFSET + 2; |
| for (int i = 0; i < 100; i = i + 8) { |
| // Copy 8 chars from src to dst |
| unsafe.putChar(dst, off + 0, src[i + 0]); |
| unsafe.putChar(dst, off + 2, src[i + 1]); |
| unsafe.putChar(dst, off + 4, src[i + 2]); |
| unsafe.putChar(dst, off + 6, src[i + 3]); |
| unsafe.putChar(dst, off + 8, src[i + 4]); |
| unsafe.putChar(dst, off + 10, src[i + 5]); |
| unsafe.putChar(dst, off + 12, src[i + 6]); |
| unsafe.putChar(dst, off + 14, src[i + 7]); |
| } |
| } |
| } |