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/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __nextafterf = nextafterf
#include "libm.h"
float
nextafterf(float x, float y) {
float w;
int *pw = (int *) &w;
int *px = (int *) &x;
int *py = (int *) &y;
int ix, iy, iz;
ix = px[0];
iy = py[0];
if ((ix & ~0x80000000) > 0x7f800000)
return (x * y); /* + -> * for Cheetah */
if ((iy & ~0x80000000) > 0x7f800000)
return (y * x); /* + -> * for Cheetah */
if (ix == iy || (ix | iy) == 0x80000000)
return (y); /* C99 requirement */
if ((ix & ~0x80000000) == 0)
iz = 1 | (iy & 0x80000000);
else if (ix > 0) {
if (ix > iy)
iz = ix - 1;
else
iz = ix + 1;
} else {
if (iy < 0 && ix < iy)
iz = ix + 1;
else
iz = ix - 1;
}
pw[0] = iz;
ix = iz & 0x7f800000;
if (ix == 0x7f800000) {
/* raise overflow */
volatile float t;
*(int *) &t = 0x7f7fffff;
t *= t;
} else if (ix == 0) {
/* raise underflow */
volatile float t;
*(int *) &t = 0x00800000;
t *= t;
}
return (w);
}
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