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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/dot.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/dot.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/dot.c b/Build/source/libs/mpfr/mpfr-src/src/dot.c new file mode 100644 index 00000000000..9b4006c09d1 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/dot.c @@ -0,0 +1,59 @@ +/* mpfr_dot -- dot product of two array of numbers + +Copyright 2018-2020 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" + +/* FIXME: handle intermediate overflows and underflows. */ + +/* res <- a[0]*b[0] + ... + a[n-1]*b[n-1] */ +int +mpfr_dot (mpfr_ptr res, const mpfr_ptr *a, const mpfr_ptr *b, + unsigned long n, mpfr_rnd_t rnd) +{ + mpfr_t *c; + size_t i; + int inex; + mpfr_ptr *tab; + + if (MPFR_UNLIKELY (n == 0)) + { + MPFR_SET_ZERO (res); + MPFR_SET_POS (res); + MPFR_RET (0); + } + + c = (mpfr_t *) mpfr_allocate_func (n * sizeof (mpfr_t)); + tab = (mpfr_ptr *) mpfr_allocate_func (n * sizeof (mpfr_ptr)); + for (i = 0; i < n; i++) + { + mpfr_init2 (c[i], mpfr_get_prec (a[i]) + mpfr_get_prec (b[i])); + inex = mpfr_mul (c[i], a[i], b[i], MPFR_RNDZ); /* exact except... */ + MPFR_ASSERTN (inex == 0); /* failure in case of overflow/underflow */ + tab[i] = c[i]; + } + inex = mpfr_sum (res, tab, n, rnd); + for (i = 0; i < n; i++) + mpfr_clear (c[i]); + mpfr_free_func (c, n * sizeof (mpfr_t)); + mpfr_free_func (tab, n * sizeof (mpfr_ptr)); + return inex; +} |