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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
parent531680aebfa57f25b24b993f3c911af1ca8981e3 (diff)
* 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')
-rw-r--r--sysdeps/generic/s_ctanh.c16
-rw-r--r--sysdeps/generic/s_ctanhf.c16
2 files changed, 26 insertions, 6 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;
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;