65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
|
/* $NetBSD: fpclassifyf_ieee754.c,v 1.3 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 <sys/cdefs.h>
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
__RCSID("$NetBSD: fpclassifyf_ieee754.c,v 1.3 2008/04/28 20:22:59 martin Exp $");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <machine/ieee.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 7.12.3.1 fpclassify - classify real floating type
|
||
|
|
* IEEE 754 single-precision version
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
__fpclassifyf(float x)
|
||
|
|
{
|
||
|
|
union ieee_single_u u;
|
||
|
|
|
||
|
|
u.sngu_f = x;
|
||
|
|
|
||
|
|
if (u.sngu_sng.sng_exp == 0) {
|
||
|
|
if (u.sngu_sng.sng_frac == 0)
|
||
|
|
return FP_ZERO;
|
||
|
|
else
|
||
|
|
return FP_SUBNORMAL;
|
||
|
|
} else if (u.sngu_sng.sng_exp == SNG_EXP_INFNAN) {
|
||
|
|
if (u.sngu_sng.sng_frac == 0)
|
||
|
|
return FP_INFINITE;
|
||
|
|
else
|
||
|
|
return FP_NAN;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FP_NORMAL;
|
||
|
|
}
|