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dot.c
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1 /* mpfr_dot -- dot product of two array of numbers
2 
3 Copyright 2018-2020 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramba projects, INRIA.
5 
6 This file is part of the GNU MPFR Library.
7 
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
12 
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
17 
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22 
23 #include "mpfr-impl.h"
24 
25 /* FIXME: handle intermediate overflows and underflows. */
26 
27 /* res <- a[0]*b[0] + ... + a[n-1]*b[n-1] */
28 int
30  unsigned long n, mpfr_rnd_t rnd)
31 {
32  mpfr_t *c;
33  size_t i;
34  int inex;
35  mpfr_ptr *tab;
36 
37  if (MPFR_UNLIKELY (n == 0))
38  {
40  MPFR_SET_POS (res);
41  MPFR_RET (0);
42  }
43 
44  c = (mpfr_t *) mpfr_allocate_func (n * sizeof (mpfr_t));
45  tab = (mpfr_ptr *) mpfr_allocate_func (n * sizeof (mpfr_ptr));
46  for (i = 0; i < n; i++)
47  {
49  inex = mpfr_mul (c[i], a[i], b[i], MPFR_RNDZ); /* exact except... */
50  MPFR_ASSERTN (inex == 0); /* failure in case of overflow/underflow */
51  tab[i] = c[i];
52  }
53  inex = mpfr_sum (res, tab, n, rnd);
54  for (i = 0; i < n; i++)
55  mpfr_clear (c[i]);
56  mpfr_free_func (c, n * sizeof (mpfr_t));
57  mpfr_free_func (tab, n * sizeof (mpfr_ptr));
58  return inex;
59 }
#define n
Definition: t4ht.c:1290
#define b
Definition: jpegint.h:372
int mpfr_dot(mpfr_ptr res, const mpfr_ptr *a, const mpfr_ptr *b, unsigned long n, mpfr_rnd_t rnd)
Definition: dot.c:29
#define c(n)
Definition: gpos-common.c:150
#define a(n)
Definition: gpos-common.c:148
small capitals from c petite p scientific i
Definition: afcover.h:80
static const char * tab[]
Definition: xdirtest.c:23
void mpfr_free_func(void *ptr, size_t size)
Definition: mpfr-gmp.c:330
void * mpfr_allocate_func(size_t alloc_size)
Definition: mpfr-gmp.c:308
#define MPFR_UNLIKELY(x)
Definition: mpfr-impl.h:1490
#define MPFR_SET_POS(x)
Definition: mpfr-impl.h:1143
#define MPFR_SET_ZERO(x)
Definition: mpfr-impl.h:1085
#define MPFR_RET(I)
Definition: mpfr-impl.h:1182
#define MPFR_ASSERTN(expr)
Definition: mpfr-impl.h:495
void mpfr_clear(mpfr_ptr m)
Definition: clear.c:26
void mpfr_init2(mpfr_ptr x, mpfr_prec_t p)
Definition: init2.c:26
__mpfr_struct mpfr_t[1]
Definition: mpfr.h:250
int mpfr_sum(mpfr_ptr, const mpfr_ptr *, unsigned long, mpfr_rnd_t)
Definition: sum.c:1266
#define mpfr_get_prec(_x)
Definition: mpfr.h:848
mpfr_rnd_t
Definition: mpfr.h:102
@ MPFR_RNDZ
Definition: mpfr.h:104
int mpfr_mul(mpfr_ptr, mpfr_srcptr, mpfr_srcptr, mpfr_rnd_t)
Definition: mul.c:732
Definition: sh2.c:920
#define rnd(x)
Definition: xim.h:106