projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 05ecdcef SS |
1 | /*- |
| 2 | * Copyright (c) 2003 The NetBSD Foundation, Inc. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to The NetBSD Foundation | |
| 6 | * by Klaus Klein. | |
| 7 | * | |
| 8 | * Redistribution and use in source and binary forms, with or without | |
| 9 | * modification, are permitted provided that the following conditions | |
| 10 | * are met: | |
| 11 | * 1. Redistributions of source code must retain the above copyright | |
| 12 | * notice, this list of conditions and the following disclaimer. | |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 | * notice, this list of conditions and the following disclaimer in the | |
| 15 | * documentation and/or other materials provided with the distribution. | |
| 16 | * 3. All advertising materials mentioning features or use of this software | |
| 17 | * must display the following acknowledgement: | |
| 18 | * This product includes software developed by the NetBSD | |
| 19 | * Foundation, Inc. and its contributors. | |
| 20 | * 4. Neither the name of The NetBSD Foundation nor the names of its | |
| 21 | * contributors may be used to endorse or promote products derived | |
| 22 | * from this software without specific prior written permission. | |
| 23 | * | |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
| 25 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 26 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 27 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
| 28 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 34 | * POSSIBILITY OF SUCH DAMAGE. | |
| 35 | * | |
| 36 | * $NetBSD: signbitl.c,v 1.1 2004/01/15 19:43:45 kleink Exp $ | |
| 05ecdcef SS |
37 | */ |
| 38 | ||
| 05ecdcef SS |
39 | #include <machine/ieee.h> |
| 40 | #include <math.h> | |
| 41 | ||
| 42 | /* | |
| 43 | * 7.12.3.6 signbit - determine whether the sign of an argument is negative | |
| 44 | * IEEE 754 compatible 80-bit extended-precision Intel 386 version | |
| 45 | */ | |
| 46 | int | |
| 47 | __signbitl(long double x) | |
| 48 | { | |
| 49 | union ieee_ext_u u; | |
| 50 | ||
| 51 | u.extu_ld = x; | |
| 52 | ||
| 53 | return (u.extu_ext.ext_sign == 1); | |
| 54 | } |