sysdeps/ieee754/ldbl-128/s_f64xfmaf128.c

   1 /* Fused multiply-add of _Float128 value, converting the result to _Float64x.
   2    Copyright (C) 2021-2024 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 #include <tininess.h>
  22
  23 /* math_ldbl.h defines _Float128 to long double for this directory,
  24    but when they are different, this function must be defined with
  25    _Float128 arguments to avoid defining an alias with an incompatible
  26    type.  */
  27 #undef _Float128
  28
  29 #if __HAVE_FLOAT64X_LONG_DOUBLE && __HAVE_DISTINCT_FLOAT128
  30 _Float64x
  31 __f64xfmaf128 (_Float128 x, _Float128 y, _Float128 z)
  32 {
  33   NARROW_FMA_ROUND_TO_ODD (x, y, z, _Float64x, union ieee854_long_double, l,
  34                            mantissa3, TININESS_AFTER_ROUNDING);
  35 }
  36 libm_alias_float64x_float128 (fma)
  37 #else
  38 /* Defined as an alias of fmal.  */
  39 #endif