diff -r 7bbaa3c416e7 -r f0312c7d5b37 test/micro/org/openjdk/bench/vm/compiler/BitSetAndReset.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/micro/org/openjdk/bench/vm/compiler/BitSetAndReset.java	Wed Nov 13 11:21:15 2019 +0100
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2019 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.
+ */
+package org.openjdk.bench.vm.compiler;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.*;
+
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+public class BitSetAndReset {
+    private static final int COUNT = 10_000;
+
+    private static final long MASK63 = 0x8000_0000_0000_0000L;
+    private static final long MASK31 = 0x0000_0000_8000_0000L;
+    private static final long MASK15 = 0x0000_0000_0000_8000L;
+    private static final long MASK00 = 0x0000_0000_0000_0001L;
+
+    private long andq, orq;
+    private boolean success = true;
+
+    @TearDown(Level.Iteration)
+    public void finish() {
+        if (!success)
+            throw new AssertionError("Failure while setting or clearing long vector bits!");
+    }
+
+    @Benchmark
+    public void bitSet(Blackhole bh) {
+        for (int i=0; i<COUNT; i++) {
+            andq = MASK63 | MASK31 | MASK15 | MASK00;
+            orq = 0;
+            bh.consume(test63());
+            bh.consume(test31());
+            bh.consume(test15());
+            bh.consume(test00());
+            success &= andq == 0 && orq == (MASK63 | MASK31 | MASK15 | MASK00);
+        }
+    }
+
+    private long test63() {
+        andq &= ~MASK63;
+        orq |= MASK63;
+        return 0L;
+    }
+    private long test31() {
+        andq &= ~MASK31;
+        orq |= MASK31;
+        return 0L;
+    }
+    private long test15() {
+        andq &= ~MASK15;
+        orq |= MASK15;
+        return 0L;
+    }
+    private long test00() {
+        andq &= ~MASK00;
+        orq |= MASK00;
+        return 0L;
+    }
+
+    private static final long MASK62 = 0x4000_0000_0000_0000L;
+    private static final long MASK61 = 0x2000_0000_0000_0000L;
+    private static final long MASK60 = 0x1000_0000_0000_0000L;
+
+    private long orq63, orq62, orq61, orq60;
+
+    @Benchmark
+    public void throughput(Blackhole bh) {
+        for (int i=0; i<COUNT; i++) {
+            orq63 = orq62 = orq61 = orq60 = 0;
+            bh.consume(testTp());
+        }
+    }
+
+    private long testTp() {
+        orq63 |= MASK63;
+        orq62 |= MASK62;
+        orq61 |= MASK61;
+        orq60 |= MASK60;
+        return 0L;
+    }
+}