diff options
Diffstat (limited to 'sysdeps/generic/s_ctanhf.c')
| -rw-r--r-- | sysdeps/generic/s_ctanhf.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/sysdeps/generic/s_ctanhf.c b/sysdeps/generic/s_ctanhf.c index cfcabab36a..c331dbaabb 100644 --- a/sysdeps/generic/s_ctanhf.c +++ b/sysdeps/generic/s_ctanhf.c @@ -1,5 +1,5 @@ /* Complex hyperbole tangent for float. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -61,8 +61,18 @@ __ctanhf (__complex__ float x) den = (__ieee754_coshf (2.0 * __real__ x) + cos2ix); - __real__ res = __ieee754_sinhf (2.0 * __real__ x) / den; - __imag__ res = sin2ix / den; + if (den == 0.0f) + { + __complex__ float ez = __cexpf (x); + __complex__ float emz = __cexpf (-x); + + res = (ez - emz) / (ez + emz); + } + else + { + __real__ res = __ieee754_sinhf (2.0 * __real__ x) / den; + __imag__ res = sin2ix / den; + } } return res; |