/*
 * 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 __scalbf = scalbf

#include "libm.h"

float
scalbf(float x, float y) {
        int     ix, iy, hx, hy, n;

        ix = *(int *)&x;
        iy = *(int *)&y;
        hx = ix & ~0x80000000;
        hy = iy & ~0x80000000;

        if (hx > 0x7f800000 || hy >= 0x7f800000) {
                /* x is nan or y is inf or nan */
                return ((iy < 0)? x / -y : x * y);
        }

        /* see if y is an integer without raising inexact */
        if (hy >= 0x4b000000) {
                /* |y| >= 2^23, so it must be an integer */
                n = (iy < 0)? -65000 : 65000;
        } else if (hy < 0x3f800000) {
                /* |y| < 1, so it must be zero or non-integer */
                return ((hy == 0)? x : (x - x) / (x - x));
        } else {
                if (hy & ((1 << (0x96 - (hy >> 23))) - 1))
                        return ((y - y) / (y - y));
                n = (int)y;
        }
        return (scalbnf(x, n));
}