1 /* Return arc hyperbolic cosine for 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/>. */
25 M_DECL_FUNC (__cacosh
) (CFLOAT x
)
28 int rcls
= fpclassify (__real__ x
);
29 int icls
= fpclassify (__imag__ x
);
31 if (rcls
<= FP_INFINITE
|| icls
<= FP_INFINITE
)
33 if (icls
== FP_INFINITE
)
35 __real__ res
= M_HUGE_VAL
;
40 __imag__ res
= M_COPYSIGN ((rcls
== FP_INFINITE
42 ? M_MLIT (M_PI
) - M_MLIT (M_PI_4
)
44 : M_MLIT (M_PI_2
)), __imag__ x
);
46 else if (rcls
== FP_INFINITE
)
48 __real__ res
= M_HUGE_VAL
;
51 __imag__ res
= M_COPYSIGN (signbit (__real__ x
)
52 ? M_MLIT (M_PI
) : 0, __imag__ x
);
60 __imag__ res
= M_MLIT (M_PI_2
);
65 else if (rcls
== FP_ZERO
&& icls
== FP_ZERO
)
68 __imag__ res
= M_COPYSIGN (M_MLIT (M_PI_2
), __imag__ x
);
74 __real__ y
= -__imag__ x
;
75 __imag__ y
= __real__ x
;
77 y
= M_SUF (__kernel_casinh
) (y
, 1);
79 if (signbit (__imag__ x
))
81 __real__ res
= __real__ y
;
82 __imag__ res
= -__imag__ y
;
86 __real__ res
= -__real__ y
;
87 __imag__ res
= __imag__ y
;
94 declare_mgen_alias (__cacosh
, cacosh
)