Home | History | Annotate | Line # | Download | only in gen
fpclassifyd.c revision 1.2 
      1 /*	$NetBSD: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 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: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $");
     42 #endif
     43 
     44 #include <machine/vaxfp.h>
     45 #include <math.h>
     46 
     47 /*
     48  * 7.12.3.1 fpclassify - classify real floating type
     49  *          VAX D_floating version
     50  *
     51  *          Implementation notes:
     52  *          Reserved operand -> FP_ROP
     53  *          True zero        -> FP_ZERO
     54  *          Dirty zero       -> FP_DIRTY_ZERO
     55  *          Finite           -> FP_NORMAL
     56  */
     57 int
     58 __fpclassifyd(double x)
     59 {
     60 	union vax_dfloating_u u;
     61 
     62 	u.dfltu_d = x;
     63 
     64 	if (u.dfltu_dflt.dflt_exp == 0) {
     65 		if (u.dfltu_dflt.dflt_sign != 0)
     66 			return FP_ROP;
     67 		else if (u.dfltu_dflt.dflt_frach != 0 ||
     68 			 u.dfltu_dflt.dflt_fracm != 0 ||
     69 			 u.dfltu_dflt.dflt_fracl != 0)
     70 			return FP_DIRTYZERO;
     71 		else
     72 			return FP_ZERO;
     73 	} else {
     74 		return FP_NORMAL;
     75 	}
     76 }
     77