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 <assert.h> 46 #include <math.h> 47 48 /* 49 * 7.12.3.1 fpclassify - classify real floating type 50 * IEEE 754 compatible 80-bit extended-precision Intel 386 version 51 */ 52 int 53 __fpclassifyl(long double x) 54 { 55 union ieee_ext_u u; 56 57 u.extu_ld = x; 58 59 _DIAGASSERT(u.extu_ext.ext_exp == 0 || u.extu_ext.ext_int == 1); 60 61 if (u.extu_ext.ext_exp == 0) { 62 if (u.extu_ext.ext_frach == 0 && u.extu_ext.ext_fracl == 0) 63 return FP_ZERO; 64 else 65 return FP_SUBNORMAL; 66 } else if (u.extu_ext.ext_exp == EXT_EXP_INFNAN) { 67 if (u.extu_ext.ext_frach == 0 && u.extu_ext.ext_fracl == 0) 68 return FP_INFINITE; 69 else 70 return FP_NAN; 71 } 72 73 return FP_NORMAL; 74 } 75