139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* Implementation of the MATMUL 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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/* Dimensions: retarray(x,y) a(x, count) b(count,y).
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Either a or b can be rank 1. In this case x or y is 1. */
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void
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__matmul_r8 (gfc_array_r8 * retarray, gfc_array_r8 * a, gfc_array_r8 * b)
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{
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GFC_REAL_8 *abase;
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GFC_REAL_8 *bbase;
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GFC_REAL_8 *dest;
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GFC_REAL_8 res;
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index_type rxstride;
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index_type rystride;
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index_type xcount;
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index_type ycount;
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index_type xstride;
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index_type ystride;
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index_type x;
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index_type y;
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GFC_REAL_8 *pa;
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GFC_REAL_8 *pb;
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index_type astride;
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index_type bstride;
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index_type count;
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index_type n;
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assert (GFC_DESCRIPTOR_RANK (a) == 2
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|| GFC_DESCRIPTOR_RANK (b) == 2);
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abase = a->data;
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bbase = b->data;
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dest = retarray->data;
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if (retarray->dim[0].stride == 0)
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retarray->dim[0].stride = 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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if (GFC_DESCRIPTOR_RANK (retarray) == 1)
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{
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rxstride = retarray->dim[0].stride;
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rystride = rxstride;
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}
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else
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{
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rxstride = retarray->dim[0].stride;
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rystride = retarray->dim[1].stride;
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}
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/* If we have rank 1 parameters, zero the absent stride, and set the size to
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one. */
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if (GFC_DESCRIPTOR_RANK (a) == 1)
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{
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astride = a->dim[0].stride;
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count = a->dim[0].ubound + 1 - a->dim[0].lbound;
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xstride = 0;
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rxstride = 0;
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xcount = 1;
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}
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else
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{
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astride = a->dim[1].stride;
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count = a->dim[1].ubound + 1 - a->dim[1].lbound;
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xstride = a->dim[0].stride;
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xcount = a->dim[0].ubound + 1 - a->dim[0].lbound;
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}
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if (GFC_DESCRIPTOR_RANK (b) == 1)
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{
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bstride = b->dim[0].stride;
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assert(count == b->dim[0].ubound + 1 - b->dim[0].lbound);
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ystride = 0;
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rystride = 0;
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ycount = 1;
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}
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else
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{
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bstride = b->dim[0].stride;
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assert(count == b->dim[0].ubound + 1 - b->dim[0].lbound);
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ystride = b->dim[1].stride;
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ycount = b->dim[1].ubound + 1 - b->dim[1].lbound;
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}
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for (y = 0; y < ycount; y++)
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{
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for (x = 0; x < xcount; x++)
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{
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/* Do the summation for this element. For real and integer types
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this is the same as DOT_PRODUCT. For complex types we use do
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a*b, not conjg(a)*b. */
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pa = abase;
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pb = bbase;
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res = 0;
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for (n = 0; n < count; n++)
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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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*dest = res;
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dest += rxstride;
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abase += xstride;
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}
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abase -= xstride * xcount;
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bbase += ystride;
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dest += rystride - (rxstride * xcount);
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}
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}
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