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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /math/s_ctanhf.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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diff --git a/math/s_ctanhf.c b/math/s_ctanhf.c
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+/* Complex hyperbole tangent for float.
+ 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.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <complex.h>
+#include <fenv.h>
+#include <math.h>
+
+#include "math_private.h"
+
+
+__complex__ float
+__ctanhf (__complex__ float x)
+{
+ __complex__ float res;
+
+ if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+ {
+ if (__isinff (__real__ x))
+ {
+ __real__ res = __copysignf (1.0, __real__ x);
+ __imag__ res = __copysignf (0.0, __imag__ x);
+ }
+ else if (__imag__ x == 0.0)
+ {
+ res = x;
+ }
+ else
+ {
+ __real__ res = __nanf ("");
+ __imag__ res = __nanf ("");
+
+#ifdef FE_INVALID
+ if (__isinff (__imag__ x))
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else
+ {
+ float sin2ix, cos2ix;
+ float den;
+
+ __sincosf (2.0 * __imag__ x, &sin2ix, &cos2ix);
+
+ den = (__ieee754_coshf (2.0 * __real__ x) + cos2ix);
+
+ 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;
+}
+#ifndef __ctanhf
+weak_alias (__ctanhf, ctanhf)
+#endif