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authorUlrich Drepper <drepper@redhat.com>2005-07-07 23:29:00 +0000
committerUlrich Drepper <drepper@redhat.com>2005-07-07 23:29:00 +0000
commit531680aebfa57f25b24b993f3c911af1ca8981e3 (patch)
tree634e80ce5a4f474e7cadaba2755f36d0ad86eeab /sysdeps
parent8df08cb248ed8fe5fb489678774f984c4a08a534 (diff)
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(__ctanhl): Handle case of zero den better.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/s_ctanhl.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/sysdeps/generic/s_ctanhl.c b/sysdeps/generic/s_ctanhl.c
index 7bf6b39..77ca8f8 100644
--- a/sysdeps/generic/s_ctanhl.c
+++ b/sysdeps/generic/s_ctanhl.c
@@ -1,5 +1,5 @@
/* Complex hyperbole tangent for long 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 @@ __ctanhl (__complex__ long double x)
den = (__ieee754_coshl (2.0 * __real__ x) + cos2ix);
- __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den;
- __imag__ res = sin2ix / den;
+ if (den == 0.0L)
+ {
+ __complex__ long double ez = __cexpl (x);
+ __complex__ long double emz = __cexpl (-x);
+
+ res = (ez - emz) / (ez + emz);
+ }
+ else
+ {
+ __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den;
+ __imag__ res = sin2ix / den;
+ }
}
return res;