/*
 * 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 __cexpf = cexpf

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

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

static const float zero = 0.0F;

fcomplex
cexpf(fcomplex z) {
        fcomplex        ans;
        float           x, y, c, s;
        double          t;
        int             n, 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;
        if (iy == 0) {          /* y = 0 */
                F_RE(ans) = expf(x);
                F_IM(ans) = y;
        } else if (ix == 0x7f800000) {  /* x is +-inf */
                if (hx < 0) {
                        if (iy >= 0x7f800000) {
                                F_RE(ans) = zero;
                                F_IM(ans) = zero;
                        } else {
                                sincosf(y, &s, &c);
                                F_RE(ans) = zero * c;
                                F_IM(ans) = zero * s;
                        }
                } else {
                        if (iy >= 0x7f800000) {
                                F_RE(ans) = x;
                                F_IM(ans) = y - y;
                        } else {
                                sincosf(y, &s, &c);
                                F_RE(ans) = x * c;
                                F_IM(ans) = x * s;
                        }
                }
        } else {
                sincosf(y, &s, &c);
                if (ix >= 0x42B171AA) { /* |x| > 88.722... ~ log(2**128) */
#if defined(__i386) && !defined(__amd64)
                        int     rp = __swapRP(fp_extended);
#endif
                        t = __k_cexp(x, &n);
                        F_RE(ans) = (float)scalbn(t * (double)c, n);
                        F_IM(ans) = (float)scalbn(t * (double)s, n);
#if defined(__i386) && !defined(__amd64)
                        if (rp != fp_extended)
                                (void) __swapRP(rp);
#endif
                } else {
                        t = expf(x);
                        F_RE(ans) = t * c;
                        F_IM(ans) = t * s;
                }
        }
        return (ans);
}