minix/lib/nbsd_libm/src/s_fmax.c
Gianluca Guida 0dc9e0996a Import unmodified NetBSD's libm for compiling with new libc.
As the current libc includes a libm implementation, with the new libc
this is needed. Unneeded (for the moment) archs have been removed.
2011-03-18 15:52:16 +00:00

58 lines
2.1 KiB
C

/*-
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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>
__RCSID("$NetBSD: s_fmax.c,v 1.2 2010/03/08 01:05:20 snj Exp $");
#ifdef notdef
__FBSDID("$FreeBSD: src/lib/msun/src/s_fmax.c,v 1.1 2004/06/30 07:04:01 das Exp $");
#endif
#include <math.h>
#include <machine/ieee.h>
double
fmax(double x, double y)
{
union ieee_double_u u[2];
u[0].dblu_d = x;
u[1].dblu_d = y;
/* Check for NaNs to avoid raising spurious exceptions. */
if (u[0].dblu_dbl.dbl_exp == DBL_EXP_INFNAN &&
(u[0].dblu_dbl.dbl_frach | u[0].dblu_dbl.dbl_fracl) != 0)
return (y);
if (u[1].dblu_dbl.dbl_exp == DBL_EXP_INFNAN &&
(u[1].dblu_dbl.dbl_frach | u[1].dblu_dbl.dbl_fracl) != 0)
return (x);
/* Handle comparisons of signed zeroes. */
if (u[0].dblu_dbl.dbl_sign != u[1].dblu_dbl.dbl_sign)
return (u[u[0].dblu_dbl.dbl_sign].dblu_d);
return (x > y ? x : y);
}