| /* | |
| * Copyright (c) 2000, 2015, 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 "mlib_image.h" | |
| #include <jni.h> | |
| #include "jni_util.h" | |
| /* | |
| * Declare library specific JNI_Onload entry if static build | |
| */ | |
| DEF_STATIC_JNI_OnLoad | |
| /***************************************************************/ | |
| typedef union { | |
| mlib_d64 db; | |
| struct { | |
| #ifdef _LITTLE_ENDIAN | |
| mlib_s32 int1, int0; | |
| #else | |
| mlib_s32 int0, int1; | |
| #endif | |
| } two_int; | |
| } type_union_mlib_d64; | |
| #define DVAIN52 4.503599627370496e15 | |
| /***************************************************************/ | |
| mlib_s32 mlib_ilogb(mlib_d64 X) | |
| { | |
| type_union_mlib_d64 arg; | |
| mlib_s32 n; | |
| if (X == 0.0) | |
| return -MLIB_S32_MAX; | |
| arg.db = X; | |
| n = arg.two_int.int0 & 0x7ff00000; | |
| if (n) | |
| n = (n < 0x7ff00000) ? (n >> 20) - 1023 : MLIB_S32_MAX; | |
| else { | |
| arg.db = X * DVAIN52; | |
| n = ((arg.two_int.int0 & 0x7ff00000) >> 20) - 1075; | |
| } | |
| return n; | |
| } | |
| /***************************************************************/ |