/*
 * 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 __ccoshf = ccoshf

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

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

static const float zero = 0.0F, half = 0.5F;

fcomplex
ccoshf(fcomplex z) {
        float           t, x, y, S, C;
        double          w;
        int             hx, ix, hy, iy, n;
        fcomplex        ans;

        x = F_RE(z);
        y = F_IM(z);
        hx = THE_WORD(x);
        ix = hx & 0x7fffffff;
        hy = THE_WORD(y);
        iy = hy & 0x7fffffff;
        x = fabsf(x);
        y = fabsf(y);

        sincosf(y, &S, &C);
        if (ix >= 0x41600000) { /* |x| > 14 = prec/2 (14,28,34,60) */
                if (ix >= 0x42B171AA) { /* |x| > 88.722... ~ log(2**128) */
                        if (ix >= 0x7f800000) { /* |x| is inf or NaN */
                                if (iy == 0) {
                                        F_RE(ans) = x;
                                        F_IM(ans) = y;
                                } else if (iy >= 0x7f800000) {
                                        F_RE(ans) = x;
                                        F_IM(ans) = x - y;
                                } else {
                                        F_RE(ans) = C * x;
                                        F_IM(ans) = S * x;
                                }
                        } else {
#if defined(__i386) && !defined(__amd64)
                                int     rp = __swapRP(fp_extended);
#endif
                                /* return (C, S) * exp(x) / 2 */
                                w = __k_cexp((double)x, &n);
                                F_RE(ans) = (float)scalbn(C * w, n - 1);
                                F_IM(ans) = (float)scalbn(S * w, n - 1);
#if defined(__i386) && !defined(__amd64)
                                if (rp != fp_extended)
                                        (void) __swapRP(rp);
#endif
                        }
                } else {
                        t = expf(x) * half;
                        F_RE(ans) = C * t;
                        F_IM(ans) = S * t;
                }
        } else {
                if (ix == 0) {  /* x = 0, return (C,0) */
                        F_RE(ans) = C;
                        F_IM(ans) = zero;
                } else {
                        F_RE(ans) = C * coshf(x);
                        F_IM(ans) = S * sinhf(x);
                }
        }
        if ((hx ^ hy) < 0)
                F_IM(ans) = -F_IM(ans);
        return (ans);
}