1 /* Return cosine of a complex type.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
20 #include "quadmath-imp.h"
23 cacosq (__complex128 x
)
27 int rcls
= fpclassifyq (__real__ x
);
28 int icls
= fpclassifyq (__imag__ x
);
30 if (rcls
<= QUADFP_INFINITE
|| icls
<= QUADFP_INFINITE
31 || (rcls
== QUADFP_ZERO
&& icls
== QUADFP_ZERO
))
35 __real__ res
= (__float128
) M_PI_2q
- __real__ y
;
36 if (__real__ res
== 0)
38 __imag__ res
= -__imag__ y
;
42 __real__ y
= -__imag__ x
;
43 __imag__ y
= __real__ x
;
45 y
= __quadmath_kernel_casinhq (y
, 1);
47 __real__ res
= __imag__ y
;
48 __imag__ res
= __real__ y
;