libgfortran/generated/dotprod_c16.c

   1 /* Implementation of the DOT_PRODUCT intrinsic
   2    Copyright 2002 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4    and Feng Wang <fengwang@nudt.edu.cn>
   5
   6 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   7
   8 Libgfortran is free software; you can redistribute it and/or
   9 modify it under the terms of the GNU General Public
  10 License as published by the Free Software Foundation; either
  11 version 2 of the License, or (at your option) any later version.
  12
  13 In addition to the permissions in the GNU General Public License, the
  14 Free Software Foundation gives you unlimited permission to link the
  15 compiled version of this file into combinations with other programs,
  16 and to distribute those combinations without any restriction coming
  17 from the use of this file.  (The General Public License restrictions
  18 do apply in other respects; for example, they cover modification of
  19 the file, and distribution when not linked into a combine
  20 executable.)
  21
  22 Libgfortran is distributed in the hope that it will be useful,
  23 but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 GNU General Public License for more details.
  26
  27 You should have received a copy of the GNU General Public
  28 License along with libgfortran; see the file COPYING.  If not,
  29 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  30 Boston, MA 02110-1301, USA.  */
  31
  32 #include "config.h"
  33 #include <stdlib.h>
  34 #include <assert.h>
  35 #include "libgfortran.h"
  36
  37 #if defined (HAVE_GFC_COMPLEX_16)
  38
  39 typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) char_array;
  40
  41 extern GFC_COMPLEX_16 dot_product_c16 (gfc_array_c16 * const restrict a,
  42         gfc_array_c16 * const restrict b);
  43 export_proto(dot_product_c16);
  44
  45 /* Both parameters will already have been converted to the result type.  */
  46 GFC_COMPLEX_16
  47 dot_product_c16 (gfc_array_c16 * const restrict a, gfc_array_c16 * const restrict b)
  48 {
  49   const GFC_COMPLEX_16 * restrict pa;
  50   const GFC_COMPLEX_16 * restrict pb;
  51   GFC_COMPLEX_16 res;
  52   index_type count;
  53   index_type astride;
  54   index_type bstride;
  55
  56   assert (GFC_DESCRIPTOR_RANK (a) == 1
  57           && GFC_DESCRIPTOR_RANK (b) == 1);
  58
  59   if (a->dim[0].stride == 0)
  60     a->dim[0].stride = 1;
  61   if (b->dim[0].stride == 0)
  62     b->dim[0].stride = 1;
  63
  64   astride = a->dim[0].stride;
  65   bstride = b->dim[0].stride;
  66   count = a->dim[0].ubound + 1 - a->dim[0].lbound;
  67   res = 0;
  68   pa = a->data;
  69   pb = b->data;
  70
  71   while (count--)
  72     {
  73       res += __builtin_conjl (*pa) * *pb;
  74       pa += astride;
  75       pb += bstride;
  76     }
  77
  78   return res;
  79 }
  80
  81 #endif