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fpclassifyl.c revision 1.1 
      1 /*	$NetBSD: fpclassifyl.c,v 1.1 2003/10/28 22:05:37 kleink Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 __RCSID("$NetBSD: fpclassifyl.c,v 1.1 2003/10/28 22:05:37 kleink Exp $");
     42 #endif
     43 
     44 #include <machine/ieee.h>
     45 #include <math.h>
     46 
     47 /*
     48  * 7.12.3.1 fpclassify - classify real floating type
     49  *          IEEE 754 compatible 128-bit extended-precision version
     50  */
     51 int
     52 __fpclassifyl(long double x)
     53 {
     54 	union ieee_ext_u u;
     55 
     56 	u.extu_ld = x;
     57 
     58 	if (u.extu_ext.ext_exp == 0) {
     59 		if (u.extu_ext.ext_frach  == 0 && u.extu_ext.ext_frachm == 0 &&
     60 		    u.extu_ext.ext_fraclm == 0 && u.extu_ext.ext_fracl  == 0)
     61 			return FP_ZERO;
     62 		else
     63 			return FP_SUBNORMAL;
     64 	} else if (u.extu_ext.ext_exp == EXT_EXP_INFNAN) {
     65 		if (u.extu_ext.ext_frach  == 0 && u.extu_ext.ext_frachm == 0 &&
     66 		    u.extu_ext.ext_fraclm == 0 && u.extu_ext.ext_fracl  == 0)
     67 			return FP_INFINITE;
     68 		else
     69 			return FP_NAN;
     70 	}
     71 
     72 	return FP_NORMAL;
     73 }
     74