/*
 * 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 __clogf = clogf

#include "libm.h"
#include "complex_wrapper.h"

#if defined(__i386) && !defined(__amd64)
extern int __swapRP(int);
#endif

fcomplex
clogf(fcomplex z) {
        fcomplex        ans;
        float           x, y, ax, ay;
        double          dx, dy;
        int             ix, iy, hx, hy;

        x = F_RE(z);
        y = F_IM(z);
        hx = THE_WORD(x);
        hy = THE_WORD(y);
        ix = hx & 0x7fffffff;
        iy = hy & 0x7fffffff;
        ay = fabsf(y);
        ax = fabsf(x);
        F_IM(ans) = atan2f(y, x);
        if (ix >= 0x7f800000 || iy >= 0x7f800000) {
                /* x or y is Inf or NaN */
                if (iy == 0x7f800000)
                        F_RE(ans) = ay;
                else if (ix == 0x7f800000)
                        F_RE(ans) = ax;
                else
                        F_RE(ans) = ax + ay;
        } else {
#if defined(__i386) && !defined(__amd64)
                int     rp = __swapRP(fp_extended);
#endif
                dx = (double)ax;
                dy = (double)ay;
                if (ix == 0x3f800000)
                        F_RE(ans) = (float)(0.5 * log1p(dy * dy));
                else if (iy == 0x3f800000)
                        F_RE(ans) = (float)(0.5 * log1p(dx * dx));
                else if ((ix | iy) == 0)
                        F_RE(ans) = -1.0f / ax;
                else
                        F_RE(ans) = (float)(0.5 * log(dx * dx + dy * dy));
#if defined(__i386) && !defined(__amd64)
                if (rp != fp_extended)
                        (void) __swapRP(rp);
#endif
        }
        return (ans);
}