1 files changed, 40 insertions, 0 deletions
diff --git a/libquadmath/math/cprojq.c b/libquadmath/math/cprojq.c
new file mode 100644
index 000000000..6092c7325
--- /dev/null
+++ b/libquadmath/math/cprojq.c
@@ -0,0 +1,40 @@
+/* Compute projection of complex __float128 value to Riemann sphere.
+   Copyright (C) 1997, 1999, 2010 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
+cprojq (__complex128 x)
+{
+  if (isnanq (__real__ x) && isnanq (__imag__ x))
+    return x;
+  else if (!finiteq (__real__ x) || !finiteq (__imag__ x))
+    {
+      __complex128 res;
+
+      __real__ res = __builtin_inf ();
+      __imag__ res = copysignq (0.0, __imag__ x);
+
+      return res;
+    }
+
+  return x;
+}