/* $NetBSD: fpclassifyd_ieee754.c,v 1.2 2008/04/28 20:22:59 martin Exp $ */ /*- * Copyright (c) 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: fpclassifyd_ieee754.c,v 1.2 2008/04/28 20:22:59 martin Exp $"); #endif #include #include /* * 7.12.3.1 fpclassify - classify real floating type * IEEE 754 double-precision version */ int __fpclassifyd(double x) { union ieee_double_u u; u.dblu_d = x; if (u.dblu_dbl.dbl_exp == 0) { if (u.dblu_dbl.dbl_frach == 0 && u.dblu_dbl.dbl_fracl == 0) return FP_ZERO; else return FP_SUBNORMAL; } else if (u.dblu_dbl.dbl_exp == DBL_EXP_INFNAN) { if (u.dblu_dbl.dbl_frach == 0 && u.dblu_dbl.dbl_fracl == 0) return FP_INFINITE; else return FP_NAN; } return FP_NORMAL; }