59 lines
1.7 KiB
Text
59 lines
1.7 KiB
Text
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`/* Implementation of the NORM2 intrinsic
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Copyright (C) 2010-2022 Free Software Foundation, Inc.
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Contributed by Tobias Burnus <burnus@net-b.de>
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This file is part of the GNU Fortran runtime library (libgfortran).
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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 General Public
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License as published by the Free Software Foundation; either
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version 3 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 General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"'
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include(iparm.m4)dnl
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include(ifunction.m4)dnl
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include(`mtype.m4')dnl
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`#if defined (HAVE_'atype_name`) && defined (HAVE_'rtype_name`) && 'hasmathfunc(sqrt) && hasmathfunc(fabs)
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mathfunc_macro
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ARRAY_FUNCTION(0,
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` 'rtype_name` scale;
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result = 0;
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scale = 1;',
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` if (*src != 0)
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{
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'rtype_name` absX, val;
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absX = MATHFUNC(fabs) (*src);
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if (scale < absX)
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{
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val = scale / absX;
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result = 1 + result * val * val;
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scale = absX;
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}
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else
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{
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val = absX / scale;
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result += val * val;
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}
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}',
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` result = scale * MATHFUNC(sqrt) (result);')
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#endif
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