libgfortran/generated/matmul_r4.c

   1 /* Implementation of the MATMUL intrinsic
   2    Copyright 2002 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfor).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Lesser General Public
   9 License as published by the Free Software Foundation; either
  10 version 2.1 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU Lesser General Public License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public
  18 License along with libgfor; see the file COPYING.LIB.  If not,
  19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include <stdlib.h>
  24 #include <assert.h>
  25 #include "libgfortran.h"
  26
  27 /* Dimensions: retarray(x,y) a(x, count) b(count,y).
  28    Either a or b can be rank 1.  In this case x or y is 1.  */
  29 void
  30 __matmul_r4 (gfc_array_r4 * retarray, gfc_array_r4 * a, gfc_array_r4 * b)
  31 {
  32   GFC_REAL_4 *abase;
  33   GFC_REAL_4 *bbase;
  34   GFC_REAL_4 *dest;
  35   GFC_REAL_4 res;
  36   index_type rxstride;
  37   index_type rystride;
  38   index_type xcount;
  39   index_type ycount;
  40   index_type xstride;
  41   index_type ystride;
  42   index_type x;
  43   index_type y;
  44
  45   GFC_REAL_4 *pa;
  46   GFC_REAL_4 *pb;
  47   index_type astride;
  48   index_type bstride;
  49   index_type count;
  50   index_type n;
  51
  52   assert (GFC_DESCRIPTOR_RANK (a) == 2
  53           || GFC_DESCRIPTOR_RANK (b) == 2);
  54   abase = a->data;
  55   bbase = b->data;
  56   dest = retarray->data;
  57
  58   if (retarray->dim[0].stride == 0)
  59     retarray->dim[0].stride = 1;
  60   if (a->dim[0].stride == 0)
  61     a->dim[0].stride = 1;
  62   if (b->dim[0].stride == 0)
  63     b->dim[0].stride = 1;
  64
  65
  66   if (GFC_DESCRIPTOR_RANK (retarray) == 1)
  67     {
  68       rxstride = retarray->dim[0].stride;
  69       rystride = rxstride;
  70     }
  71   else
  72     {
  73       rxstride = retarray->dim[0].stride;
  74       rystride = retarray->dim[1].stride;
  75     }
  76
  77   /* If we have rank 1 parameters, zero the absent stride, and set the size to
  78      one.  */
  79   if (GFC_DESCRIPTOR_RANK (a) == 1)
  80     {
  81       astride = a->dim[0].stride;
  82       count = a->dim[0].ubound + 1 - a->dim[0].lbound;
  83       xstride = 0;
  84       rxstride = 0;
  85       xcount = 1;
  86     }
  87   else
  88     {
  89       astride = a->dim[1].stride;
  90       count = a->dim[1].ubound + 1 - a->dim[1].lbound;
  91       xstride = a->dim[0].stride;
  92       xcount = a->dim[0].ubound + 1 - a->dim[0].lbound;
  93     }
  94   if (GFC_DESCRIPTOR_RANK (b) == 1)
  95     {
  96       bstride = b->dim[0].stride;
  97       assert(count == b->dim[0].ubound + 1 - b->dim[0].lbound);
  98       ystride = 0;
  99       rystride = 0;
 100       ycount = 1;
 101     }
 102   else
 103     {
 104       bstride = b->dim[0].stride;
 105       assert(count == b->dim[0].ubound + 1 - b->dim[0].lbound);
 106       ystride = b->dim[1].stride;
 107       ycount = b->dim[1].ubound + 1 - b->dim[1].lbound;
 108     }
 109
 110   for (y = 0; y < ycount; y++)
 111     {
 112       for (x = 0; x < xcount; x++)
 113         {
 114           /* Do the summation for this element.  For real and integer types
 115              this is the same as DOT_PRODUCT.  For complex types we use do
 116              a*b, not conjg(a)*b.  */
 117           pa = abase;
 118           pb = bbase;
 119           res = 0;
 120
 121           for (n = 0; n < count; n++)
 122             {
 123               res += *pa * *pb;
 124               pa += astride;
 125               pb += bstride;
 126             }
 127
 128           *dest = res;
 129
 130           dest += rxstride;
 131           abase += xstride;
 132         }
 133       abase -= xstride * xcount;
 134       bbase += ystride;
 135       dest += rystride - (rxstride * xcount);
 136     }
 137 }
 138