llrint.c revision 1ec68d336ba97cd53f46053ac10401d16014d075
/*
* 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.
*/
#endif
/*
* llrint(x) rounds its argument to the nearest integer according
* to the current rounding direction and converts the result to a
* 64 bit signed integer.
*
* If x is NaN, infinite, or so large that the nearest integer would
* exceed 64 bits, the invalid operation exception is raised. If x
* is not an integer, the inexact exception is raised.
*/
#include "libm.h"
long long
llrint(double x) {
/*
* Note: The following code works on x86 (in the default rounding
* precision mode), but one should just use the fistpll instruction
* instead.
*/
union {
unsigned i[2];
double d;
unsigned hx;
xx.d = x;
/* add and subtract a power of two to round x to an integer */
#else
#endif
}
/* now x is nan, inf, or integral */
return ((long long) x);
}