mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* $NetBSD: isfinitel.c,v 1.3 2008/04/28 20:22:56 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 <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: isfinitel.c,v 1.3 2008/04/28 20:22:56 martin Exp $");
|
|
#endif
|
|
|
|
#include <machine/ieee.h>
|
|
#include <assert.h>
|
|
#include <float.h>
|
|
#include <math.h>
|
|
|
|
#if defined(__HAVE_LONG_DOUBLE) && LDBL_MANT_DIG == 64
|
|
/*
|
|
* 7.12.3.2 isfinite - determine whether an argument has finite value
|
|
* IEEE 754 compatible 80-bit extended-precision Intel 386 version
|
|
*/
|
|
int
|
|
__isfinitel(long double x)
|
|
{
|
|
union ieee_ext_u u;
|
|
|
|
u.extu_ld = x;
|
|
|
|
assert(u.extu_ext.ext_exp == 0 ||
|
|
(u.extu_ext.ext_frach & 0x80000000));
|
|
|
|
if (u.extu_ext.ext_exp == EXT_EXP_INFNAN)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|