/* mpfr_fms -- Floating multiply-subtract Copyright 2001-2002, 2004, 2006-2023 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); } |