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(__ctanhl): Handle case of zero den better.

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This commit is contained in:
Ulrich Drepper 2005-07-07 23:29:00 +00:00
parent 8df08cb248
commit 531680aebf
1 changed files with 13 additions and 3 deletions
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16
sysdeps/generic/s_ctanhl.c
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@ -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;