1 /* $NetBSD: fpclassifyl.c,v 1.4 2008/04/28 20:22:58 martin 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: fpclassifyl.c,v 1.4 2008/04/28 20:22:58 martin Exp $"); 35 #endif 36 37 #include <machine/ieee.h> 38 #include <assert.h> 39 #include <math.h> 40 41 /* 42 * 7.12.3.1 fpclassify - classify real floating type 43 * IEEE 754 compatible 80-bit extended-precision Intel 386 version 44 */ 45 int 46 __fpclassifyl(long double x) 47 { 48 union ieee_ext_u u; 49 50 u.extu_ld = x; 51 52 _DIAGASSERT(u.extu_ext.ext_exp == 0 || 53 (u.extu_ext.ext_frach & 0x80000000)); 54 55 if (u.extu_ext.ext_exp == 0) { 56 if ((u.extu_ext.ext_frach & 0x7fffffff) == 0 && 57 u.extu_ext.ext_fracl == 0) 58 return FP_ZERO; 59 else 60 return FP_SUBNORMAL; 61 } else if (u.extu_ext.ext_exp == EXT_EXP_INFNAN) { 62 if ((u.extu_ext.ext_frach & 0x7fffffff) == 0 && 63 u.extu_ext.ext_fracl == 0) 64 return FP_INFINITE; 65 else 66 return FP_NAN; 67 } 68 69 return FP_NORMAL; 70 } 71