65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Implementation of the DOT_PRODUCT intrinsic
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfor; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <stdlib.h>
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#include <assert.h>
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#include "libgfortran.h"
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typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) char_array;
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/* Both parameters will already have been converted to the result type. */
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GFC_REAL_8
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__dot_product_r8 (gfc_array_r8 * a, gfc_array_r8 * b)
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{
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GFC_REAL_8 *pa;
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GFC_REAL_8 *pb;
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GFC_REAL_8 res;
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index_type count;
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index_type astride;
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index_type bstride;
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assert (GFC_DESCRIPTOR_RANK (a) == 1
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&& GFC_DESCRIPTOR_RANK (b) == 1);
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if (a->dim[0].stride == 0)
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a->dim[0].stride = 1;
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if (b->dim[0].stride == 0)
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b->dim[0].stride = 1;
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astride = a->dim[0].stride;
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bstride = b->dim[0].stride;
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count = a->dim[0].ubound + 1 - a->dim[0].lbound;
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res = 0;
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pa = a->data;
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pb = b->data;
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while (count--)
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{
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res += *pa * *pb;
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pa += astride;
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pb += bstride;
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}
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return res;
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}
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