--- /dev/null	2021-01-19 17:38:25.908523431 +0000
+++ new/test/compiler/floatingpoint/8207838/TestFloatSyncJNIArgs.java	2021-01-25 19:32:23.419967136 +0000
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2015, 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2018 Red Hat, Inc. 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.
+ */
+
+public class TestFloatSyncJNIArgs {
+    static {
+        try {
+            System.loadLibrary("TestFloatSyncJNIArgs");
+        } catch (UnsatisfiedLinkError e) {
+            System.out.println("could not load native lib: " + e);
+        }
+    }
+
+    private static final int numberOfThreads = 8;
+
+    static volatile Error testFailed = null;
+
+    public synchronized static native float combine15floats(
+        float f1, float f2, float f3, float f4,
+        float f5, float f6, float f7, float f8,
+        float f9, float f10, float f11, float f12,
+        float f13, float f14, float f15);
+
+    public synchronized static native double combine15doubles(
+        double d1, double d2, double d3, double d4,
+        double d5, double d6, double d7, double d8,
+        double d9, double d10, double d11, double d12,
+        double d13, double d14, double d15);
+
+    static void test() throws Exception {
+        Thread[] threads = new Thread[numberOfThreads];
+
+        for (int i = 0; i < numberOfThreads; i++) {
+            threads[i] = new Thread(() -> {
+                for (int j = 0; j < 10000; j++) {
+                    float f = combine15floats(1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f,
+                                              9, 10, 11, 12, 13, 14, 15);
+                    if (f != 81720.0f) {
+                        testFailed = new Error("jni function didn't combine 15 float args properly: " + f);
+                        throw testFailed;
+                    }
+                }
+            });
+        }
+        for (int i = 0; i < numberOfThreads; i++) {
+            threads[i].start();
+        }
+        for (int i = 0; i < numberOfThreads; i++) {
+            threads[i].join();
+        }
+        if (testFailed != null) {
+            throw testFailed;
+        }
+
+        for (int i = 0; i < numberOfThreads; i++) {
+            threads[i] = new Thread(() -> {
+                for (int j = 0; j < 10000; j++) {
+                    double d = combine15doubles(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
+                                                9, 10, 11, 12, 13, 14, 15);
+                    if (d != 81720.0) {
+                        testFailed = new Error("jni function didn't combine 15 double args properly: " + d);
+                        throw testFailed;
+                    }
+                }
+            });
+        }
+        for (int i = 0; i < numberOfThreads; i++) {
+           threads[i].start();
+        }
+        for (int i = 0; i < numberOfThreads; i++) {
+            threads[i].join();
+        }
+        if (testFailed != null) {
+            throw testFailed;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        for (int i = 0; i < 200; ++i) {
+            test();
+        }
+    }
+}