/*
* 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
* or http://www.opensolaris.org/os/licensing.
* 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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __scalb = scalb
#pragma weak _scalb = scalb
#include "libm.h"
double
scalb(double x, double fn) {
int hn, in, n;
double z;
if (isnan(x) || isnan(fn))
return (x * fn);
in = ((int *)&fn)[HIWORD];
hn = in & ~0x80000000;
if (hn == 0x7ff00000) /* fn is inf */
return (_SVID_libm_err(x, fn, 47));
/* see if fn is an integer without raising inexact */
if (hn >= 0x43300000) {
/* |fn| >= 2^52, so it must be an integer */
n = (in < 0)? -65000 : 65000;
} else if (hn < 0x3ff00000) {
/* |fn| < 1, so it must be zero or non-integer */
return ((fn == 0.0)? x : (x - x) / (x - x));
} else if (hn < 0x41400000) {
/* |fn| < 2^21 */
if ((hn & ((1 << (0x413 - (hn >> 20))) - 1))
| ((int *)&fn)[LOWORD])
return ((x - x) / (x - x));
n = (int)fn;
} else {
if (((int *)&fn)[LOWORD] & ((1 << (0x433 - (hn >> 20))) - 1))
return ((x - x) / (x - x));
n = (in < 0)? -65000 : 65000;
}
z = scalbn(x, n);
if (z != x) {
if (z == 0.0)
return (_SVID_libm_err(x, fn, 33));
if (!finite(z))
return (_SVID_libm_err(x, fn, 32));
}
return (z);
}