1 /* Implementation of the NORM2 intrinsic
2 Copyright 2010 Free Software Foundation, Inc.
3 Contributed by Tobias Burnus <burnus@net-b.de>
5 This file is part of the GNU Fortran runtime library (libgfortran).
7 Libgfortran is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either
10 version 3 of the License, or (at your option) any later version.
12 Libgfortran is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
26 #include "libgfortran.h"
32 #if defined (HAVE_GFC_REAL_10) && defined (HAVE_GFC_REAL_10)
35 extern void norm2_r10 (gfc_array_r10 * const restrict,
36 gfc_array_r10 * const restrict, const index_type * const restrict);
37 export_proto(norm2_r10);
40 norm2_r10 (gfc_array_r10 * const restrict retarray,
41 gfc_array_r10 * const restrict array,
42 const index_type * const restrict pdim)
44 index_type count[GFC_MAX_DIMENSIONS];
45 index_type extent[GFC_MAX_DIMENSIONS];
46 index_type sstride[GFC_MAX_DIMENSIONS];
47 index_type dstride[GFC_MAX_DIMENSIONS];
48 const GFC_REAL_10 * restrict base;
49 GFC_REAL_10 * restrict dest;
57 /* Make dim zero based to avoid confusion. */
59 rank = GFC_DESCRIPTOR_RANK (array) - 1;
61 len = GFC_DESCRIPTOR_EXTENT(array,dim);
64 delta = GFC_DESCRIPTOR_STRIDE(array,dim);
66 for (n = 0; n < dim; n++)
68 sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
69 extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
74 for (n = dim; n < rank; n++)
76 sstride[n] = GFC_DESCRIPTOR_STRIDE(array, n + 1);
77 extent[n] = GFC_DESCRIPTOR_EXTENT(array, n + 1);
83 if (retarray->data == NULL)
85 size_t alloc_size, str;
87 for (n = 0; n < rank; n++)
92 str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1];
94 GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str);
99 retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;
101 alloc_size = sizeof (GFC_REAL_10) * GFC_DESCRIPTOR_STRIDE(retarray,rank-1)
106 /* Make sure we have a zero-sized array. */
107 GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
112 retarray->data = internal_malloc_size (alloc_size);
116 if (rank != GFC_DESCRIPTOR_RANK (retarray))
117 runtime_error ("rank of return array incorrect in"
118 " NORM intrinsic: is %ld, should be %ld",
119 (long int) (GFC_DESCRIPTOR_RANK (retarray)),
122 if (unlikely (compile_options.bounds_check))
123 bounds_ifunction_return ((array_t *) retarray, extent,
124 "return value", "NORM");
127 for (n = 0; n < rank; n++)
130 dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
136 dest = retarray->data;
139 while (continue_loop)
141 const GFC_REAL_10 * restrict src;
153 for (n = 0; n < len; n++, src += delta)
158 GFC_REAL_10 absX, val;
163 result = 1.0L + result * val * val;
173 result = scale * sqrtl (result);
177 /* Advance to the next element. */
182 while (count[n] == extent[n])
184 /* When we get to the end of a dimension, reset it and increment
185 the next dimension. */
187 /* We could precalculate these products, but this is a less
188 frequently used path so probably not worth it. */
189 base -= sstride[n] * extent[n];
190 dest -= dstride[n] * extent[n];
194 /* Break out of the look. */