8256245: AArch64: Implement Base64 decoding intrinsic

Reviewed-by: aph, ngasson

test/micro/org/openjdk/bench/java/util/Base64Decode.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2021, Huawei Technologies Co., Ltd. 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.
+ */
+
+package org.openjdk.micro.bench.java.util;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.Base64;
+import java.util.Random;
+import java.util.ArrayList;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+public class Base64Decode {
+
+    private Base64.Encoder encoder, mimeEncoder;
+    private Base64.Decoder decoder, mimeDecoder;
+    private ArrayList<byte[]> encoded, mimeEncoded, errorEncoded;
+    private byte[] decoded, mimeDecoded, errorDecoded;
+
+    private static final int TESTSIZE = 1000;
+
+    @Param({"1", "3", "7", "32", "64", "80", "96",
+            "112", "512", "1000", "20000", "50000"})
+    private int maxNumBytes;
+
+    @Param({"4"})
+    private int lineSize;
+
+    private byte[] lineSeparator = {'\r', '\n'};
+
+    /* Other value can be tested by passing parameters to the JMH
+       tests: -p errorIndex=3,64,144,208,272,1000,20000. */
+    @Param({"144"})
+    private int errorIndex;
+
+    @Setup
+    public void setup() {
+        Random r = new Random(1123);
+
+        decoded = new byte[maxNumBytes + 1];
+        encoder = Base64.getEncoder();
+        decoder = Base64.getDecoder();
+        encoded = new ArrayList<byte[]> ();
+
+        mimeDecoded = new byte[maxNumBytes + 1];
+        mimeEncoder = Base64.getMimeEncoder(lineSize, lineSeparator);
+        mimeDecoder = Base64.getMimeDecoder();
+        mimeEncoded = new ArrayList<byte[]> ();
+
+        errorDecoded = new byte[errorIndex + 100];
+        errorEncoded = new ArrayList<byte[]> ();
+
+        for (int i = 0; i < TESTSIZE; i++) {
+            int srcLen = 1 + r.nextInt(maxNumBytes);
+            byte[] src = new byte[srcLen];
+            byte[] dst = new byte[((srcLen + 2) / 3) * 4];
+            r.nextBytes(src);
+            encoder.encode(src, dst);
+            encoded.add(dst);
+
+            int mimeSrcLen = 1 + r.nextInt(maxNumBytes);
+            byte[] mimeSrc = new byte[mimeSrcLen];
+            byte[] mimeDst = new byte[((mimeSrcLen + 2) / 3) * 4 * (lineSize + lineSeparator.length) / lineSize];
+            r.nextBytes(mimeSrc);
+            mimeEncoder.encode(mimeSrc, mimeDst);
+            mimeEncoded.add(mimeDst);
+
+            int errorSrcLen = errorIndex + r.nextInt(100);
+            byte[] errorSrc = new byte[errorSrcLen];
+            byte[] errorDst = new byte[(errorSrcLen + 2) / 3 * 4];
+            r.nextBytes(errorSrc);
+            encoder.encode(errorSrc, errorDst);
+            errorEncoded.add(errorDst);
+            errorDst[errorIndex] = (byte) '?';
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(TESTSIZE)
+    public void testBase64Decode(Blackhole bh) {
+        for (byte[] s : encoded) {
+            decoder.decode(s, decoded);
+            bh.consume(decoded);
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(TESTSIZE)
+    public void testBase64MIMEDecode(Blackhole bh) {
+        for (byte[] s : mimeEncoded) {
+            mimeDecoder.decode(s, mimeDecoded);
+            bh.consume(mimeDecoded);
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(TESTSIZE)
+    public void testBase64WithErrorInputsDecode (Blackhole bh) {
+        for (byte[] s : errorEncoded) {
+            try {
+                 decoder.decode(s, errorDecoded);
+                 bh.consume(errorDecoded);
+            } catch (IllegalArgumentException e) {
+                 bh.consume(e);
+            }
+        }
+    }
+}