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authorUlrich Drepper <drepper@redhat.com>2005-07-07 23:31:46 +0000
committerUlrich Drepper <drepper@redhat.com>2005-07-07 23:31:46 +0000
commit96191db217c69f989c68121a2ceb06c24939b848 (patch)
tree3177491155775123f72433689d2eeffb30817e6b /sysdeps/generic/s_ctanh.c
parent531680aebfa57f25b24b993f3c911af1ca8981e3 (diff)
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* 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.
Diffstat (limited to 'sysdeps/generic/s_ctanh.c')
-rw-r--r--sysdeps/generic/s_ctanh.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/sysdeps/generic/s_ctanh.c b/sysdeps/generic/s_ctanh.c
index 971cd9040c..fe38dae291 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;