diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_cexpf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_cexpf.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_cexpf.c b/sysdeps/libm-ieee754/s_cexpf.c new file mode 100644 index 0000000000..14cfb19766 --- /dev/null +++ b/sysdeps/libm-ieee754/s_cexpf.c @@ -0,0 +1,63 @@ +/* Return value of complex exponential function for float complex value. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <complex.h> +#include <math.h> + + +__complex__ float +__cexpf (__complex__ float x) +{ + __complex__ float retval; + + if (isfinite (__real__ x)) + { + if (isfinite (__imag__ x)) + { + retval = __expf (__real__ x) * (__cosf (__imag__ x) + + 1i * __sinf (__imag__ x)); + } + else + /* If the imaginary part is +-inf or NaN and the real part is + not +-inf the result is NaN + iNan. */ + retval = __nanf ("") + 1.0i * __nanf (""); + } + else if (__isinff (__real__ x)) + { + if (isfinite (__imag__ x)) + { + if (signbit (__real__ x) == 0 && __imag__ x == 0.0) + retval = HUGE_VALF; + else + retval = ((signbit (__real__ x) ? 0.0 : HUGE_VALF) + * (__cosf (__imag__ x) + 1i * __sinf (__imag__ x))); + } + else if (signbit (__real__ x)) + retval = HUGE_VALF + 1.0i * __nanf (""); + else + retval = 0.0; + } + else + /* If the real part is NaN the result is NaN + iNan. */ + retval = __nanf ("") + 1.0i * __nanf (""); + + return retval; +} +weak_alias (__cexpf, cexpf) |