1 /*

     2  * Copyright 1997-2005 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 #include "jni.h"

    27 #include "jni_util.h"

    28 #include "jlong.h"

    29 #include "jvm.h"

    30 

    31 #include "java_lang_Double.h"

    32 

    33 /*

    34  * Find the double float corresponding to a given bit pattern

    35  */

    36 JNIEXPORT jdouble JNICALL

    37 Java_java_lang_Double_longBitsToDouble(JNIEnv *env, jclass unused, jlong v)

    38 {

    39     union {

    40         jlong l;

    41         double d;

    42     } u;

    43     jlong_to_jdouble_bits(&v);

    44     u.l = v;

    45     return (jdouble)u.d;

    46 }

    47 

    48 /*

    49  * Find the bit pattern corresponding to a given double float, NOT collapsing NaNs

    50  */

    51 JNIEXPORT jlong JNICALL

    52 Java_java_lang_Double_doubleToRawLongBits(JNIEnv *env, jclass unused, jdouble v)

    53 {

    54     union {

    55         jlong l;

    56         double d;

    57     } u;

    58     jdouble_to_jlong_bits(&v);

    59     u.d = (double)v;

    60     return u.l;

    61 }