Retro68/gcc/libgfortran/m4/bessel.m4

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`/* Implementation of the BESSEL_JN and BESSEL_YN transformational
function using a recurrence algorithm.
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Copyright (C) 2010-2014 Free Software Foundation, Inc.
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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 <stdlib.h>
#include <assert.h>'
include(iparm.m4)dnl
include(`mtype.m4')dnl
mathfunc_macro
`#if defined (HAVE_'rtype_name`)
#if 'hasmathfunc(jn)`
extern void bessel_jn_r'rtype_kind` ('rtype` * const restrict ret, int n1,
int n2, 'rtype_name` x);
export_proto(bessel_jn_r'rtype_kind`);
void
bessel_jn_r'rtype_kind` ('rtype` * const restrict ret, int n1, int n2, 'rtype_name` x)
{
int i;
index_type stride;
'rtype_name` last1, last2, x2rev;
stride = GFC_DESCRIPTOR_STRIDE(ret,0);
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if (ret->base_addr == NULL)
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{
size_t size = n2 < n1 ? 0 : n2-n1+1;
GFC_DIMENSION_SET(ret->dim[0], 0, size-1, 1);
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ret->base_addr = xmalloc (sizeof ('rtype_name`) * size);
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ret->offset = 0;
}
if (unlikely (n2 < n1))
return;
if (unlikely (compile_options.bounds_check)
&& GFC_DESCRIPTOR_EXTENT(ret,0) != (n2-n1+1))
runtime_error("Incorrect extent in return value of BESSEL_JN "
"(%ld vs. %ld)", (long int) n2-n1,
(long int) GFC_DESCRIPTOR_EXTENT(ret,0));
stride = GFC_DESCRIPTOR_STRIDE(ret,0);
if (unlikely (x == 0))
{
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ret->base_addr[0] = 1;
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for (i = 1; i <= n2-n1; i++)
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ret->base_addr[i*stride] = 0;
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return;
}
last1 = MATHFUNC(jn) (n2, x);
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ret->base_addr[(n2-n1)*stride] = last1;
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if (n1 == n2)
return;
last2 = MATHFUNC(jn) (n2 - 1, x);
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ret->base_addr[(n2-n1-1)*stride] = last2;
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if (n1 + 1 == n2)
return;
x2rev = GFC_REAL_'rtype_kind`_LITERAL(2.)/x;
for (i = n2-n1-2; i >= 0; i--)
{
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ret->base_addr[i*stride] = x2rev * (i+1+n1) * last2 - last1;
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last1 = last2;
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last2 = ret->base_addr[i*stride];
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}
}
#endif
#if 'hasmathfunc(yn)`
extern void bessel_yn_r'rtype_kind` ('rtype` * const restrict ret,
int n1, int n2, 'rtype_name` x);
export_proto(bessel_yn_r'rtype_kind`);
void
bessel_yn_r'rtype_kind` ('rtype` * const restrict ret, int n1, int n2,
'rtype_name` x)
{
int i;
index_type stride;
'rtype_name` last1, last2, x2rev;
stride = GFC_DESCRIPTOR_STRIDE(ret,0);
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if (ret->base_addr == NULL)
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{
size_t size = n2 < n1 ? 0 : n2-n1+1;
GFC_DIMENSION_SET(ret->dim[0], 0, size-1, 1);
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ret->base_addr = xmalloc (sizeof ('rtype_name`) * size);
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ret->offset = 0;
}
if (unlikely (n2 < n1))
return;
if (unlikely (compile_options.bounds_check)
&& GFC_DESCRIPTOR_EXTENT(ret,0) != (n2-n1+1))
runtime_error("Incorrect extent in return value of BESSEL_JN "
"(%ld vs. %ld)", (long int) n2-n1,
(long int) GFC_DESCRIPTOR_EXTENT(ret,0));
stride = GFC_DESCRIPTOR_STRIDE(ret,0);
if (unlikely (x == 0))
{
for (i = 0; i <= n2-n1; i++)
#if defined('rtype_name`_INFINITY)
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ret->base_addr[i*stride] = -'rtype_name`_INFINITY;
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#else
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ret->base_addr[i*stride] = -'rtype_name`_HUGE;
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#endif
return;
}
last1 = MATHFUNC(yn) (n1, x);
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ret->base_addr[0] = last1;
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if (n1 == n2)
return;
last2 = MATHFUNC(yn) (n1 + 1, x);
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ret->base_addr[1*stride] = last2;
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if (n1 + 1 == n2)
return;
x2rev = GFC_REAL_'rtype_kind`_LITERAL(2.)/x;
for (i = 2; i <= n1+n2; i++)
{
#if defined('rtype_name`_INFINITY)
if (unlikely (last2 == -'rtype_name`_INFINITY))
{
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ret->base_addr[i*stride] = -'rtype_name`_INFINITY;
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}
else
#endif
{
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ret->base_addr[i*stride] = x2rev * (i-1+n1) * last2 - last1;
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last1 = last2;
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last2 = ret->base_addr[i*stride];
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}
}
}
#endif
#endif'