1*7b36286aSmartynas /* $OpenBSD: fpclassifyl.c,v 1.1 2008/09/07 20:36:07 martynas Exp $ */ 2*7b36286aSmartynas /* 3*7b36286aSmartynas * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org> 4*7b36286aSmartynas * 5*7b36286aSmartynas * Permission to use, copy, modify, and distribute this software for any 6*7b36286aSmartynas * purpose with or without fee is hereby granted, provided that the above 7*7b36286aSmartynas * copyright notice and this permission notice appear in all copies. 8*7b36286aSmartynas * 9*7b36286aSmartynas * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10*7b36286aSmartynas * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11*7b36286aSmartynas * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12*7b36286aSmartynas * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13*7b36286aSmartynas * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14*7b36286aSmartynas * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15*7b36286aSmartynas * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16*7b36286aSmartynas */ 17*7b36286aSmartynas 18*7b36286aSmartynas #include <sys/types.h> 19*7b36286aSmartynas #include <machine/ieee.h> 20*7b36286aSmartynas #include <math.h> 21*7b36286aSmartynas 22*7b36286aSmartynas int 23*7b36286aSmartynas __fpclassifyl(long double e) 24*7b36286aSmartynas { 25*7b36286aSmartynas struct ieee_ext *p = (struct ieee_ext *)&e; 26*7b36286aSmartynas 27*7b36286aSmartynas if (p->ext_exp == 0) { 28*7b36286aSmartynas if (p->ext_frach == 0 && p->ext_fracl == 0) 29*7b36286aSmartynas return FP_ZERO; 30*7b36286aSmartynas else 31*7b36286aSmartynas return FP_SUBNORMAL; 32*7b36286aSmartynas } 33*7b36286aSmartynas 34*7b36286aSmartynas p->ext_frach &= ~0x80000000; /* clear normalization bit */ 35*7b36286aSmartynas 36*7b36286aSmartynas if (p->ext_exp == EXT_EXP_INFNAN) { 37*7b36286aSmartynas if (p->ext_frach == 0 && p->ext_fracl == 0) 38*7b36286aSmartynas return FP_INFINITE; 39*7b36286aSmartynas else 40*7b36286aSmartynas return FP_NAN; 41*7b36286aSmartynas } 42*7b36286aSmartynas 43*7b36286aSmartynas return FP_NORMAL; 44*7b36286aSmartynas } 45