diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/generic/s_ctanh.c | 16 | ||||
| -rw-r--r-- | sysdeps/generic/s_ctanhf.c | 16 |
3 files changed, 32 insertions, 6 deletions
@@ -1,3 +1,9 @@ +2005-07-07 Ulrich Drepper <drepper@redhat.com> + + * sysdeps/generic/s_ctanh.c (__ctanh): Handle case of zero den better. + * sysdeps/generic/s_ctanhf.c (__ctanhf): Likewise. + * sysdeps/generic/s_ctanhl.c (__ctanhl): Likewise. + 2005-04-13 H.J. Lu <hongjiu.lu@intel.com> [BZ #974] diff --git a/sysdeps/generic/s_ctanh.c b/sysdeps/generic/s_ctanh.c index 971cd90..fe38dae 100644 --- a/sysdeps/generic/s_ctanh.c +++ b/sysdeps/generic/s_ctanh.c @@ -1,5 +1,5 @@ /* Complex hyperbole tangent for double. - 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 @@ __ctanh (__complex__ double x) den = (__ieee754_cosh (2.0 * __real__ x) + cos2ix); - __real__ res = __ieee754_sinh (2.0 * __real__ x) / den; - __imag__ res = sin2ix / den; + if (den == 0.0) + { + __complex__ double ez = __cexp (x); + __complex__ double emz = __cexp (-x); + + res = (ez - emz) / (ez + emz); + } + else + { + __real__ res = __ieee754_sinh (2.0 * __real__ x) / den; + __imag__ res = sin2ix / den; + } } return res; diff --git a/sysdeps/generic/s_ctanhf.c b/sysdeps/generic/s_ctanhf.c index cfcabab..c331dba 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; |