libm/w_atan2l.c

   1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include "math_private.h"
  21 #if defined(__UCLIBC_HAS_FENV__)
  22 #include <errno.h>
  23 #endif
  24
  25 #if !defined __NO_LONG_DOUBLE_MATH
  26 /* wrapper atan2l(y,x) */
  27 long double
  28 atan2l (long double y, long double x)
  29 {
  30 # if defined(__UCLIBC_HAS_FENV__)
  31   long double z;
  32
  33   if (__builtin_expect (x == 0.0L && y == 0.0L, 0) && _LIB_VERSION == _SVID_)
  34     return __kernel_standard_l (y, x, 203); /* atan2(+-0,+-0) */
  35
  36   z = (long double) __ieee754_atan2 ((double)y,(double) x);
  37   if (__builtin_expect (z == 0.0L && y != 0.0L && isfinite (x),0))
  38     __set_errno (ERANGE);
  39   return z;
  40 # else
  41   return (long double) __ieee754_atan2 ((double)y,(double) x);
  42 # endif /* __UCLIBC_HAS_FENV__ */
  43 }
  44 #endif /* __NO_LONG_DOUBLE_MATH */