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src/fms.c
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Vincent Lefevre
Updated the "Contributed" lines.
02 фев 2025, 02:39
02 фев 2025, 02:39
a774f60
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/* mpfr_fms -- Floating multiply-subtract Copyright 2001-2002, 2004, 2006-2025 Free Software Foundation, Inc. Contributed by the Pascaline 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/>. */ #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; /* Warning! If s == z (reuse of z for the destination), s and minus_z will be different pointers in mpfr_fma, while they actually share their significand. So mpfr_fma must either assume a possible reuse of z (at least for the significand) in *any* case or compare the pointers to the significands for reuse detection, if needed. And be careful with sharing that propagates to called functions. */ MPFR_TMP_INIT_NEG (minus_z, z); return mpfr_fma (s, x, y, minus_z, rnd_mode); }