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/* Implementation of the DOT_PRODUCT intrinsic
Copyright 2002 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.org>
and Feng Wang <fengwang@nudt.edu.cn>
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfortran 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 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with libgfor; see the file COPYING.LIB. 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_COMPLEX_8 dot_product_c8 (gfc_array_c8 * a, gfc_array_c8 * b);
export_proto(dot_product_c8);
/* Both parameters will already have been converted to the result type. */
GFC_COMPLEX_8
dot_product_c8 (gfc_array_c8 * a, gfc_array_c8 * b)
{
GFC_COMPLEX_8 *pa;
GFC_COMPLEX_8 *pb;
GFC_COMPLEX_8 res;
GFC_COMPLEX_8 conjga;
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--)
{
COMPLEX_ASSIGN(conjga, REALPART (*pa), -IMAGPART (*pa));
res += conjga * *pb;
pa += astride;
pb += bstride;
}
return res;
}
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