/*
 * 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 modff = __modff
#pragma weak _modff = __modff

#include "libm.h"

float
__modff(float x, float *iptr) {
        union {
                unsigned i;
                float f;
        } xx, yy;
        unsigned hx, s;

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

        if (hx >= 0x4b000000) { /* x is NaN, infinite, or integral */
                *iptr = x;
                if (hx <= 0x7f800000)
                        xx.i &= 0x80000000;
                return (xx.f);
        }

        if (hx < 0x3f800000) {  /* |x| < 1 */
                xx.i &= 0x80000000;
                *iptr = xx.f;
                return (x);
        }

        /* split x at the binary point */
        s = xx.i & 0x80000000;
        yy.i = xx.i & ~((1 << (0x96 - (hx >> 23))) - 1);
        *iptr = yy.f;
        xx.f -= yy.f;
        xx.i = (xx.i & ~0x80000000) | s;
                                /* restore sign in case difference is 0 */
        return (xx.f);
}