lib/fabsl.c

   1 /* Absolute value.
   2    Copyright (C) 2012-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <math.h>
  21
  22 /* fabsl (x) can be defined as copysignl (x, 1.0L).
  23    Or, more directly, as (signbit (x) ? - x : x).  */
  24
  25 #if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
  26
  27 long double
  28 fabsl (long double x)
  29 {
  30   return fabs (x);
  31 }
  32
  33 #else
  34
  35 long double
  36 fabsl (long double x)
  37 {
  38   return (signbit (x) ? - x : x);
  39 }
  40
  41 #endif