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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 /sysdeps/ieee754/ldbl-128ibm/s_ctanl.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_ctanl.c')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_ctanl.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c b/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c
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+++ b/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c
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+/* Complex tangent function for long double.  IBM extended format version.
+   Copyright (C) 1997,2005,2006 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_ldbl_opt.h>
+
+#include "math_private.h"
+
+
+__complex__ long double
+__ctanl (__complex__ long double x)
+{
+  __complex__ long double res;
+
+  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+    {
+      if (__isinfl (__imag__ x))
+	{
+	  __real__ res = __copysignl (0.0, __real__ x);
+	  __imag__ res = __copysignl (1.0, __imag__ x);
+	}
+      else if (__real__ x == 0.0)
+	{
+	  res = x;
+	}
+      else
+	{
+	  __real__ res = __nanl ("");
+	  __imag__ res = __nanl ("");
+
+#ifdef FE_INVALID
+	  if (__isinfl (__real__ x))
+	    feraiseexcept (FE_INVALID);
+#endif
+	}
+    }
+  else
+    {
+      long double sin2rx, cos2rx;
+      long double den;
+
+      __sincosl (2.0 * __real__ x, &sin2rx, &cos2rx);
+
+      den = cos2rx + __ieee754_coshl (2.0 * __imag__ x);
+
+
+      if (den == 0.0)
+	{
+	  __complex__ long double ez = __cexpl (1.0i * x);
+	  __complex__ long double emz = __cexpl (-1.0i * x);
+
+	  res = (ez - emz) / (ez + emz) * -1.0i;
+	}
+      else
+	{
+	  __real__ res = sin2rx / den;
+	  __imag__ res = __ieee754_sinhl (2.0 * __imag__ x) / den;
+	}
+      /* __gcc_qmul does not respect -0.0 so we need the following fixup.  */
+      if ((__real__ res == 0.0) && (__real__ x == 0.0))
+        __real__ res = __real__ x;
+
+      if ((__real__ res == 0.0) && (__imag__ x == 0.0))
+        __imag__ res = __imag__ x;
+    }
+
+  return res;
+}
+long_double_symbol (libm, __ctanl, ctanl);