/*
 * 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 frexpf = __frexpf

#include "libm.h"

float
__frexpf(float x, int *exp) {
        union {
                unsigned i;
                float f;
        } xx;
        unsigned hx;
        int e;

        xx.f = x;
        hx = xx.i & ~0x80000000;

        if (hx >= 0x7f800000) { /* x is infinite or NaN */
                *exp = 0;
                return (x);
        }

        e = 0;
        if (hx < 0x00800000) { /* x is subnormal or zero */
                if (hx == 0) {
                        *exp = 0;
                        return (x);
                }

                /* normalize x by regarding it as an integer */
                xx.f = (int) xx.i < 0 ? -(int) hx : (int) hx;
                hx = xx.i & ~0x80000000;
                e = -149;
        }

        /* now xx.f is normal */
        xx.i = (xx.i & ~0x7f800000) | 0x3f000000;
        *exp = e + (hx >> 23) - 0x7e;
        return (xx.f);
}