fmax.c revision 25c28e83beb90e7c80452a7c818c5e6f73a07dc8
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#if defined(ELFOBJ)
#endif
/*
* fmax(x,y) returns the larger of x and y. If just one of the
* arguments is NaN, fmax returns the other argument. If both
* arguments are NaN, fmax returns NaN.
*
* See fmaxf.c for a discussion of implementation trade-offs.
*/
#include "libm.h" /* for isgreaterequal macro */
#include <fenv.h>
double
__fmax(double x, double y) {
union {
unsigned i[2];
double d;
unsigned s;
/* if y is nan, replace it by x */
if (y != y)
y = x;
/* if x is nan, replace it by y */
if (x != x)
x = y;
/* At this point, x and y are either both numeric, or both NaN */
if (!isnan(x) && !isgreaterequal(x, y))
x = y;
/*
* clear the sign of the result if either x or y has its sign clear
*/
xx.d = x;
yy.d = y;
#if defined(__sparc)
xx.i[0] &= ~s;
xx.i[1] &= ~s;
#else
#endif
return (xx.d);
}