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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libquadmath/math/cprojq.c
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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
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+++ b/libquadmath/math/cprojq.c
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+/* 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;
+}