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-rw-r--r--libquadmath/math/cacosq.c35
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diff --git a/libquadmath/math/cacosq.c b/libquadmath/math/cacosq.c
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+/* Return cosine of complex __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
+cacosq (__complex128 x)
+{
+ __complex128 y;
+ __complex128 res;
+
+ y = casinq (x);
+
+ __real__ res = M_PI_2q - __real__ y;
+ __imag__ res = -__imag__ y;
+
+ return res;
+}