1`/* Implementation of the NORM2 intrinsic
2   Copyright (C) 2010-2019 Free Software Foundation, Inc.
3   Contributed by Tobias Burnus  <burnus@net-b.de>
4
5This file is part of the GNU Fortran runtime library (libgfortran).
6
7Libgfortran is free software; you can redistribute it and/or
8modify it under the terms of the GNU General Public
9License as published by the Free Software Foundation; either
10version 3 of the License, or (at your option) any later version.
11
12Libgfortran is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24<http://www.gnu.org/licenses/>.  */
25
26#include "libgfortran.h"'
27
28include(iparm.m4)dnl
29include(ifunction.m4)dnl
30include(`mtype.m4')dnl
31
32`#if defined (HAVE_'atype_name`) && defined (HAVE_'rtype_name`) && 'hasmathfunc(sqrt) && hasmathfunc(fabs)
33
34mathfunc_macro
35
36ARRAY_FUNCTION(0,
37`	'rtype_name` scale;
38	result = 0;
39	scale = 1;',
40`	  if (*src != 0)
41	    {
42	      'rtype_name` absX, val;
43	      absX = MATHFUNC(fabs) (*src);
44	      if (scale < absX)
45		{
46		  val = scale / absX;
47		  result = 1 + result * val * val;
48		  scale = absX;
49		}
50	      else
51		{
52		  val = absX / scale;
53		  result += val * val;
54		}
55	    }',
56`   result = scale * MATHFUNC(sqrt) (result);')
57
58#endif
59