atan2pif.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
* 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 atan2pif = __atan2pif
#include "libm.h"
static const double invpi = 0.3183098861837906715377675;
float
atan2pif(float y, float x) {
int ix, iy, hx, hy;
ix = *(int *)&x;
iy = *(int *)&y;
hx = ix & ~0x80000000;
hy = iy & ~0x80000000;
if (hx > 0x7f800000 || hy > 0x7f800000) /* x or y is nan */
return (x * y);
if ((hx | hy) == 0) {
/* x and y are both zero */
if (ix == 0)
return (y);
return ((iy == 0)? 1.0f : -1.0f);
}
return ((float)(invpi * atan2((double)y, (double)x)));
}