--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libquadmath/math/casinhq.c	Sun Aug 21 07:07:55 2011 +0900
@@ -0,0 +1,78 @@
+/* Return arc hyperbole sine for __float128 value.
+   Copyright (C) 1997, 1998 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 "quadmath-imp.h"
+
+
+__complex128
+casinhq (__complex128 x)
+{
+  __complex128 res;
+  int rcls = fpclassifyq (__real__ x);
+  int icls = fpclassifyq (__imag__ x);
+
+  if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
+    {
+      if (icls == QUADFP_INFINITE)
+	{
+	  __real__ res = copysignq (HUGE_VALQ, __real__ x);
+
+	  if (rcls == QUADFP_NAN)
+	    __imag__ res = nanq ("");
+	  else
+	    __imag__ res = copysignq (rcls >= QUADFP_ZERO ? M_PI_2q : M_PI_4q,
+				      __imag__ x);
+	}
+      else if (rcls <= QUADFP_INFINITE)
+	{
+	  __real__ res = __real__ x;
+	  if ((rcls == QUADFP_INFINITE && icls >= QUADFP_ZERO)
+	      || (rcls == QUADFP_NAN && icls == QUADFP_ZERO))
+	    __imag__ res = copysignq (0.0, __imag__ x);
+	  else
+	    __imag__ res = nanq ("");
+	}
+      else
+	{
+	  __real__ res = nanq ("");
+	  __imag__ res = nanq ("");
+	}
+    }
+  else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
+    {
+      res = x;
+    }
+  else
+    {
+      __complex128 y;
+
+      __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;
+      __imag__ y = 2.0 * __real__ x * __imag__ x;
+
+      y = csqrtq (y);
+
+      __real__ y += __real__ x;
+      __imag__ y += __imag__ x;
+
+      res = clogq (y);
+    }
+
+  return res;
+}