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/* mpfr_fms -- Floating multiply-subtract
Copyright 2001-2002, 2004, 2006-2021 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-impl.h"
/* The fused-multiply-subtract (fms) of x, y and z is defined by:
fms(x,y,z)= x*y - z
Note: this is neither in IEEE 754-2008, nor in LIA-2, but both the
PowerPC and the Itanium define fms as x*y - z.
*/
int
mpfr_fms (mpfr_ptr s, mpfr_srcptr x, mpfr_srcptr y, mpfr_srcptr z,
mpfr_rnd_t rnd_mode)
{
mpfr_t minus_z;
MPFR_ALIAS (minus_z, z, -MPFR_SIGN(z), MPFR_EXP(z));
return mpfr_fma (s, x, y, minus_z, rnd_mode);
}
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