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isinfl_ieee754.c revision 1.1 
      1 /*	$NetBSD: isinfl_ieee754.c,v 1.1 2003/05/17 14:51:25 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 #if defined(LIBC_SCCS) && !defined(lint)
     44 #if 0
     45 static char sccsid[] = "@(#)isinf.c	8.1 (Berkeley) 6/4/93";
     46 #else
     47 __RCSID("$NetBSD");
     48 #endif
     49 #endif /* LIBC_SCCS and not lint */
     50 
     51 #include "namespace.h"
     52 #include <sys/types.h>
     53 #include <machine/ieee.h>
     54 #include <math.h>
     55 
     56 #if !defined(EXT_EXP_INFNAN)
     57 #include <assert.h>
     58 #endif
     59 
     60 #if 0	/* XXX Currently limited to internal use. */
     61 #ifdef __weak_alias
     62 __weak_alias(isinfl,_isinfl)
     63 #endif
     64 #endif
     65 
     66 int
     67 isinfl(long double ld)
     68 {
     69 #if defined(EXT_EXP_INFNAN)
     70 	union {
     71 		long double ld;
     72 		struct ieee_ext ldbl;
     73 	} u;
     74 
     75 	u.ld = ld;
     76 	return (u.ldbl.ext_exp == EXT_EXP_INFNAN &&
     77 	    (u.ldbl.ext_frach == 0 && u.ldbl.ext_frachm == 0 &&
     78 	     u.ldbl.ext_fraclm == 0 && u.ldbl.ext_fracl == 0));
     79 #else
     80 	_DIAGASSERT(sizeof(double) == sizeof(long double));
     81 	return (isinf((double) ld));
     82 #endif /* EXT_EXP_INFNAN */
     83 }
     84