From abfbdde177c3a7155070dda1b2cdc8292054cc26 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Wed, 14 Jul 1999 00:54:57 +0000
Subject: Update.

---
 sysdeps/generic/s_cacosh.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 sysdeps/generic/s_cacosh.c

(limited to 'sysdeps/generic/s_cacosh.c')

diff --git a/sysdeps/generic/s_cacosh.c b/sysdeps/generic/s_cacosh.c
new file mode 100644
index 0000000000..d938c64473
--- /dev/null
+++ b/sysdeps/generic/s_cacosh.c
@@ -0,0 +1,88 @@
+/* Return arc hyperbole cosine for double value.
+   Copyright (C) 1997 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <complex.h>
+#include <math.h>
+
+
+__complex__ double
+__cacosh (__complex__ double x)
+{
+  __complex__ double res;
+  int rcls = fpclassify (__real__ x);
+  int icls = fpclassify (__imag__ x);
+
+  if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
+    {
+      if (icls == FP_INFINITE)
+	{
+	  __real__ res = HUGE_VAL;
+
+	  if (rcls == FP_NAN)
+	    __imag__ res = __nan ("");
+	  else
+	    __imag__ res = __copysign ((rcls == FP_INFINITE
+					? (__real__ x < 0.0
+					   ? M_PI - M_PI_4 : M_PI_4)
+					: M_PI_2), __imag__ x);
+	}
+      else if (rcls == FP_INFINITE)
+	{
+	  __real__ res = HUGE_VAL;
+
+	  if (icls >= FP_ZERO)
+	    __imag__ res = __copysign (signbit (__real__ x) ? M_PI : 0.0,
+				       __imag__ x);
+	  else
+	    __imag__ res = __nan ("");
+	}
+      else
+	{
+	  __real__ res = __nan ("");
+	  __imag__ res = __nan ("");
+	}
+    }
+  else if (rcls == FP_ZERO && icls == FP_ZERO)
+    {
+      __real__ res = 0.0;
+      __imag__ res = __copysign (M_PI_2, __imag__ x);
+    }
+  else
+    {
+      __complex__ double y;
+
+      __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0;
+      __imag__ y = 2.0 * __real__ x * __imag__ x;
+
+      y = __csqrt (y);
+
+      __real__ y += __real__ x;
+      __imag__ y += __imag__ x;
+
+      res = __clog (y);
+    }
+
+  return res;
+}
+weak_alias (__cacosh, cacosh)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__cacosh, __cacoshl)
+weak_alias (__cacosh, cacoshl)
+#endif
-- 
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