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Diffstat (limited to 'test/compiler/loopopts/superword/TestVectorizationWithInvariant.java')
| -rw-r--r-- | test/compiler/loopopts/superword/TestVectorizationWithInvariant.java | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/test/compiler/loopopts/superword/TestVectorizationWithInvariant.java b/test/compiler/loopopts/superword/TestVectorizationWithInvariant.java new file mode 100644 index 000000000..e36664aa2 --- /dev/null +++ b/test/compiler/loopopts/superword/TestVectorizationWithInvariant.java @@ -0,0 +1,144 @@ +/* + * 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]); + } + } +} |