1 /* 2 * Copyright (c) 2015, 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 /** 26 * @test 27 * @bug 8078497 28 * @summary Tests correct alignment of vectors with loop invariant offset. 29 * @modules java.base/jdk.internal.misc 30 * @library /test/lib 31 * @run main compiler.loopopts.superword.TestVectorizationWithInvariant 32 */ 33 34 package compiler.loopopts.superword; 35 36 import jdk.internal.misc.Unsafe; 37 38 public class TestVectorizationWithInvariant { 39 40 private static Unsafe unsafe; 41 private static final long BYTE_ARRAY_OFFSET; 42 private static final long CHAR_ARRAY_OFFSET; 43 44 static { 45 unsafe = Unsafe.getUnsafe(); 46 BYTE_ARRAY_OFFSET = unsafe.arrayBaseOffset(byte[].class); 47 CHAR_ARRAY_OFFSET = unsafe.arrayBaseOffset(char[].class); 48 } 49 50 public static void main(String[] args) throws Exception { 51 byte[] byte_array1 = new byte[1000]; 52 byte[] byte_array2 = new byte[1000]; 53 char[] char_array = new char[1000]; 54 55 for (int i = 0; i < 20_000; ++i) { 56 copyByteToChar(byte_array1, byte_array2, char_array, 1); 57 copyCharToByte(char_array, byte_array1, 1); 58 copyCharToByteAligned(char_array, byte_array1); 59 copyCharToByteUnaligned(char_array, byte_array1); 60 } 61 } 62 63 /* 64 * Copy multiple consecutive chars from a byte array to a given offset in a char array 65 * to trigger C2's superword optimization. The offset in the byte array is independent 66 * of the loop induction variable and can be set to an arbitrary value. It may then not 67 * be possible to both align the LoadUS and the StoreC operations. Therefore, vectorization 68 * should only be done in this case if unaligned memory accesses are allowed. 69 */ 70 public static void copyByteToChar(byte[] src1, byte[] src2, char[] dst, int off) { 71 off = (int) BYTE_ARRAY_OFFSET + (off << 1); 72 byte[] src = src1; 73 for (int i = (int) CHAR_ARRAY_OFFSET; i < 100; i = i + 8) { 74 // Copy 8 chars from src to dst 75 unsafe.putChar(dst, i + 0, unsafe.getChar(src, off + 0)); 76 unsafe.putChar(dst, i + 2, unsafe.getChar(src, off + 2)); 77 unsafe.putChar(dst, i + 4, unsafe.getChar(src, off + 4)); 78 unsafe.putChar(dst, i + 6, unsafe.getChar(src, off + 6)); 79 unsafe.putChar(dst, i + 8, unsafe.getChar(src, off + 8)); 80 unsafe.putChar(dst, i + 10, unsafe.getChar(src, off + 10)); 81 unsafe.putChar(dst, i + 12, unsafe.getChar(src, off + 12)); 82 unsafe.putChar(dst, i + 14, unsafe.getChar(src, off + 14)); 83 84 // Prevent loop invariant code motion of char read. 85 src = (src == src1) ? src2 : src1; 86 } 87 } 88 89 /* 90 * Copy multiple consecutive chars from a char array to a given offset in a byte array 91 * to trigger C2's superword optimization. Checks for similar problems as 'copyByteToChar'. 92 */ 93 public static void copyCharToByte(char[] src, byte[] dst, int off) { 94 off = (int) BYTE_ARRAY_OFFSET + (off << 1); 95 for (int i = 0; i < 100; i = i + 8) { 96 // Copy 8 chars from src to dst 97 unsafe.putChar(dst, off + 0, src[i + 0]); 98 unsafe.putChar(dst, off + 2, src[i + 1]); 99 unsafe.putChar(dst, off + 4, src[i + 2]); 100 unsafe.putChar(dst, off + 6, src[i + 3]); 101 unsafe.putChar(dst, off + 8, src[i + 4]); 102 unsafe.putChar(dst, off + 10, src[i + 5]); 103 unsafe.putChar(dst, off + 12, src[i + 6]); 104 unsafe.putChar(dst, off + 14, src[i + 7]); 105 } 106 } 107 108 /* 109 * Variant of copyCharToByte with a constant destination array offset. 110 * The loop should always be vectorized because both the LoadUS and StoreC 111 * operations can be aligned. 112 */ 113 public static void copyCharToByteAligned(char[] src, byte[] dst) { 114 final int off = (int) BYTE_ARRAY_OFFSET; 115 for (int i = 8; i < 100; i = i + 8) { 116 // Copy 8 chars from src to dst 117 unsafe.putChar(dst, off + 0, src[i + 0]); 118 unsafe.putChar(dst, off + 2, src[i + 1]); 119 unsafe.putChar(dst, off + 4, src[i + 2]); 120 unsafe.putChar(dst, off + 6, src[i + 3]); 121 unsafe.putChar(dst, off + 8, src[i + 4]); 122 unsafe.putChar(dst, off + 10, src[i + 5]); 123 unsafe.putChar(dst, off + 12, src[i + 6]); 124 unsafe.putChar(dst, off + 14, src[i + 7]); 125 } 126 } 127 128 /* 129 * Variant of copyCharToByte with a constant destination array offset. The 130 * loop should only be vectorized if unaligned memory operations are allowed 131 * because not both the LoadUS and the StoreC can be aligned. 132 */ 133 public static void copyCharToByteUnaligned(char[] src, byte[] dst) { 134 final int off = (int) BYTE_ARRAY_OFFSET + 2; 135 for (int i = 0; i < 100; i = i + 8) { 136 // Copy 8 chars from src to dst 137 unsafe.putChar(dst, off + 0, src[i + 0]); 138 unsafe.putChar(dst, off + 2, src[i + 1]); 139 unsafe.putChar(dst, off + 4, src[i + 2]); 140 unsafe.putChar(dst, off + 6, src[i + 3]); 141 unsafe.putChar(dst, off + 8, src[i + 4]); 142 unsafe.putChar(dst, off + 10, src[i + 5]); 143 unsafe.putChar(dst, off + 12, src[i + 6]); 144 unsafe.putChar(dst, off + 14, src[i + 7]); 145 } 146 } 147 }