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`/* Implementation of the NORM2 intrinsic
Copyright (C) 2010-2022 Free Software Foundation, Inc.
Contributed by Tobias Burnus <burnus@net-b.de>
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"'
include(iparm.m4)dnl
include(ifunction.m4)dnl
include(`mtype.m4')dnl
`#if defined (HAVE_'atype_name`) && defined (HAVE_'rtype_name`) && 'hasmathfunc(sqrt) && hasmathfunc(fabs)
mathfunc_macro
ARRAY_FUNCTION(0,
` 'rtype_name` scale;
result = 0;
scale = 1;',
` if (*src != 0)
{
'rtype_name` absX, val;
absX = MATHFUNC(fabs) (*src);
if (scale < absX)
{
val = scale / absX;
result = 1 + result * val * val;
scale = absX;
}
else
{
val = absX / scale;
result += val * val;
}
}',
` result = scale * MATHFUNC(sqrt) (result);')
#endif
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