summaryrefslogtreecommitdiff
path: root/Build/source/libs/mpfr/mpfr-src/src/dot.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/dot.c')
-rw-r--r--Build/source/libs/mpfr/mpfr-src/src/dot.c59
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;
+}