third-party-mirror / GRTEv4 / cf41cedf52c87cf4f27c61e4eb8444ecb811ab13 / . / google3 / third_party / grte / v4_src / glibc-2.19 / math / s_cacos.c

/* Return cosine of complex double value. | |

Copyright (C) 1997-2014 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, see | |

<http://www.gnu.org/licenses/>. */ | |

#include <complex.h> | |

#include <math.h> | |

__complex__ double | |

__cacos (__complex__ double x) | |

{ | |

__complex__ double y; | |

__complex__ double res; | |

int rcls = fpclassify (__real__ x); | |

int icls = fpclassify (__imag__ x); | |

if (rcls <= FP_INFINITE || icls <= FP_INFINITE | |

|| (rcls == FP_ZERO && icls == FP_ZERO)) | |

{ | |

y = __casin (x); | |

__real__ res = (double) M_PI_2 - __real__ y; | |

__imag__ res = -__imag__ y; | |

} | |

else | |

{ | |

__real__ y = -__imag__ x; | |

__imag__ y = __real__ x; | |

y = __kernel_casinh (y, 1); | |

__real__ res = __imag__ y; | |

__imag__ res = __real__ y; | |

} | |

return res; | |

} | |

weak_alias (__cacos, cacos) | |

#ifdef NO_LONG_DOUBLE | |

strong_alias (__cacos, __cacosl) | |

weak_alias (__cacos, cacosl) | |

#endif |