* Copyright (c) 2011 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "complex_impl.h"
static const uint32_t
exp_ovfl = 0x42b17218,
cexp_ovfl = 0x43400074;
float complex cexpf(float complex z)
{
float x, y, exp_x;
uint32_t hx, hy;
x = crealf(z);
y = cimagf(z);
GET_FLOAT_WORD(hy, y);
hy &= 0x7fffffff;
if (hy == 0)
return CMPLXF(expf(x), y);
GET_FLOAT_WORD(hx, x);
if ((hx & 0x7fffffff) == 0)
return CMPLXF(cosf(y), sinf(y));
if (hy >= 0x7f800000) {
if ((hx & 0x7fffffff) != 0x7f800000) {
return CMPLXF(y - y, y - y);
} else if (hx & 0x80000000) {
return CMPLXF(0.0, 0.0);
} else {
return CMPLXF(x, y - y);
}
}
if (hx >= exp_ovfl && hx <= cexp_ovfl) {
* x is between 88.7 and 192, so we must scale to avoid
* overflow in expf(x).
*/
return __ldexp_cexpf(z, 0);
} else {
* Cases covered here:
* - x < exp_ovfl and exp(x) won't overflow (common case)
* - x > cexp_ovfl, so exp(x) * s overflows for all s > 0
* - x = +-Inf (generated by exp())
* - x = NaN (spurious inexact exception from y)
*/
exp_x = expf(x);
return CMPLXF(exp_x * cosf(y), exp_x * sinf(y));
}
}
