summaryrefslogtreecommitdiff
path: root/libquadmath/math/cprojq.c
diff options
context:
space:
mode:
Diffstat (limited to 'libquadmath/math/cprojq.c')
-rw-r--r--libquadmath/math/cprojq.c40
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;
+}