1 /*
2 * Copyright (c) 1997, 2005, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include "jni.h"
27 #include "jvm.h"
28
29 #include <nativehelper/JNIHelp.h>
30
31 #define NATIVE_METHOD(className, functionName, signature) \
32 { #functionName, signature, (void*)(className ## _ ## functionName) }
33
34
35 /*
36 * Find the float corresponding to a given bit pattern
37 */
38 JNIEXPORT jfloat JNICALL
Float_intBitsToFloat(JNIEnv * env,jclass unused,jint v)39 Float_intBitsToFloat(JNIEnv *env, jclass unused, jint v)
40 {
41 union {
42 int i;
43 float f;
44 } u;
45 u.i = (long)v;
46 return (jfloat)u.f;
47 }
48
49 /*
50 * Find the bit pattern corresponding to a given float, NOT collapsing NaNs
51 */
52 JNIEXPORT jint JNICALL
Float_floatToRawIntBits(JNIEnv * env,jclass unused,jfloat v)53 Float_floatToRawIntBits(JNIEnv *env, jclass unused, jfloat v)
54 {
55 union {
56 int i;
57 float f;
58 } u;
59 u.f = (float)v;
60 return (jint)u.i;
61 }
62 static JNINativeMethod gMethods[] = {
63 NATIVE_METHOD(Float, intBitsToFloat, "(I)F"),
64 NATIVE_METHOD(Float, floatToRawIntBits, "(F)I"),
65 };
66
register_java_lang_Float(JNIEnv * env)67 void register_java_lang_Float(JNIEnv* env) {
68 jniRegisterNativeMethods(env, "java/lang/Float", gMethods, NELEM(gMethods));
69 }
70