sysdeps/ieee754/ldbl-128ibm/s_ceill.c

   1 /* Ceil (round to +inf) long double floating-point values.
   2    IBM extended format long double version.
   3    Copyright (C) 2006-2016 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   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.
  10
  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.
  15
  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/>.  */
  19
  20 #include <math.h>
  21 #include <math_ldbl_opt.h>
  22 #include <float.h>
  23 #include <ieee754.h>
  24
  25
  26 long double
  27 __ceill (long double x)
  28 {
  29   double xh, xl, hi, lo;
  30
  31   ldbl_unpack (x, &xh, &xl);
  32
  33   /* Return Inf, Nan, +/-0 unchanged.  */
  34   if (__builtin_expect (xh != 0.0
  35                         && __builtin_isless (__builtin_fabs (xh),
  36                                              __builtin_inf ()), 1))
  37     {
  38       hi = __ceil (xh);
  39       if (hi != xh)
  40         {
  41           /* The high part is not an integer; the low part does not
  42              affect the result.  */
  43           xh = hi;
  44           xl = 0;
  45         }
  46       else
  47         {
  48           /* The high part is a nonzero integer.  */
  49           lo = __ceil (xl);
  50           xh = hi;
  51           xl = lo;
  52           ldbl_canonicalize_int (&xh, &xl);
  53         }
  54     }
  55   else
  56     /* Quiet signaling NaN arguments.  */
  57     xh += xh;
  58
  59   return ldbl_pack (xh, xl);
  60 }
  61
  62 long_double_symbol (libm, __ceill, ceill);