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      1 /*-
      2  * Copyright (c) 2004 David Schultz <das (at) FreeBSD.ORG>
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     24  * SUCH DAMAGE.
     25  *
     26  * $FreeBSD$
     27  */
     28 
     29 #include <math.h>
     30 #include <sys/cdefs.h>
     31 #include "fpmath.h"
     32 
     33 /*
     34  * XXX These routines belong in libm, but they must remain in libc for
     35  *     binary compat until we can bump libm's major version number.
     36  */
     37 
     38 int
     39 __isinf(double d)
     40 {
     41 	union IEEEd2bits u;
     42 
     43 	u.d = d;
     44 	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
     45 }
     46 
     47 int
     48 __isinff(float f)
     49 {
     50 	union IEEEf2bits u;
     51 
     52 	u.f = f;
     53 	return (u.bits.exp == 255 && u.bits.man == 0);
     54 }
     55 
     56 int
     57 __isinfl(long double e)
     58 {
     59 	union IEEEl2bits u;
     60 
     61 	u.e = e;
     62 	mask_nbit_l(u);
     63 #ifndef __alpha__
     64 	return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
     65 #else
     66 	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
     67 #endif
     68 }
     69