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