sysdeps/ieee754/ldbl-128/s_f64xsubf128.c

   1 /* Subtract _Float128 values, converting the result to _Float64x.
   2    Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math-narrow.h>
  21
  22 /* math_ldbl.h defines _Float128 to long double for this directory,
  23    but when they are different, this function must be defined with
  24    _Float128 arguments to avoid defining an alias with an incompatible
  25    type.  */
  26 #undef _Float128
  27
  28 _Float64x
  29 __f64xsubf128 (_Float128 x, _Float128 y)
  30 {
  31 #if __HAVE_FLOAT64X_LONG_DOUBLE && __HAVE_DISTINCT_FLOAT128
  32   NARROW_SUB_ROUND_TO_ODD (x, y, _Float64x, union ieee854_long_double, l,
  33                            mantissa3);
  34 #else
  35   NARROW_SUB_TRIVIAL (x, y, _Float64x);
  36 #endif
  37 }
  38 libm_alias_float64x_float128 (sub)