76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* Implementation of the DOT_PRODUCT intrinsic
|
|
Copyright 2002 Free Software Foundation, Inc.
|
|
Contributed by Paul Brook <paul@nowt.org>
|
|
|
|
This file is part of the GNU Fortran 95 runtime library (libgfortran).
|
|
|
|
Libgfortran is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file into combinations with other programs,
|
|
and to distribute those combinations without any restriction coming
|
|
from the use of this file. (The General Public License restrictions
|
|
do apply in other respects; for example, they cover modification of
|
|
the file, and distribution when not linked into a combine
|
|
executable.)
|
|
|
|
Libgfortran 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public
|
|
License along with libgfortran; see the file COPYING. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include "config.h"
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include "libgfortran.h"
|
|
|
|
typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) char_array;
|
|
|
|
extern GFC_REAL_8 dot_product_r8 (gfc_array_r8 * a, gfc_array_r8 * b);
|
|
export_proto(dot_product_r8);
|
|
|
|
/* Both parameters will already have been converted to the result type. */
|
|
GFC_REAL_8
|
|
dot_product_r8 (gfc_array_r8 * a, gfc_array_r8 * b)
|
|
{
|
|
GFC_REAL_8 *pa;
|
|
GFC_REAL_8 *pb;
|
|
GFC_REAL_8 res;
|
|
index_type count;
|
|
index_type astride;
|
|
index_type bstride;
|
|
|
|
assert (GFC_DESCRIPTOR_RANK (a) == 1
|
|
&& GFC_DESCRIPTOR_RANK (b) == 1);
|
|
|
|
if (a->dim[0].stride == 0)
|
|
a->dim[0].stride = 1;
|
|
if (b->dim[0].stride == 0)
|
|
b->dim[0].stride = 1;
|
|
|
|
astride = a->dim[0].stride;
|
|
bstride = b->dim[0].stride;
|
|
count = a->dim[0].ubound + 1 - a->dim[0].lbound;
|
|
res = 0;
|
|
pa = a->data;
|
|
pb = b->data;
|
|
|
|
while (count--)
|
|
{
|
|
res += *pa * *pb;
|
|
pa += astride;
|
|
pb += bstride;
|
|
}
|
|
|
|
return res;
|
|
}
|