--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/native/libjava/Double.c	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 1997, 2005, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jlong.h"
+#include "jvm.h"
+
+#include "java_lang_Double.h"
+
+/*
+ * Find the double float corresponding to a given bit pattern
+ */
+JNIEXPORT jdouble JNICALL
+Java_java_lang_Double_longBitsToDouble(JNIEnv *env, jclass unused, jlong v)
+{
+    union {
+        jlong l;
+        double d;
+    } u;
+    jlong_to_jdouble_bits(&v);
+    u.l = v;
+    return (jdouble)u.d;
+}
+
+/*
+ * Find the bit pattern corresponding to a given double float, NOT collapsing NaNs
+ */
+JNIEXPORT jlong JNICALL
+Java_java_lang_Double_doubleToRawLongBits(JNIEnv *env, jclass unused, jdouble v)
+{
+    union {
+        jlong l;
+        double d;
+    } u;
+    jdouble_to_jlong_bits(&v);
+    u.d = (double)v;
+    return u.l;
+}