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0cd0559e | 1 | /* Implementation of the NORM2 intrinsic |
a5544970 | 2 | Copyright (C) 2010-2019 Free Software Foundation, Inc. |
0cd0559e TB |
3 | Contributed by Tobias Burnus <burnus@net-b.de> |
4 | ||
5 | This file is part of the GNU Fortran runtime library (libgfortran). | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. | |
20 | ||
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/>. */ | |
25 | ||
26 | #include "libgfortran.h" | |
0cd0559e TB |
27 | |
28 | ||
08fd13d4 FXC |
29 | |
30 | #if defined (HAVE_GFC_REAL_8) && defined (HAVE_GFC_REAL_8) && defined (HAVE_SQRT) && defined (HAVE_FABS) | |
31 | ||
32 | #define MATHFUNC(funcname) funcname | |
0cd0559e TB |
33 | |
34 | ||
35 | extern void norm2_r8 (gfc_array_r8 * const restrict, | |
36 | gfc_array_r8 * const restrict, const index_type * const restrict); | |
37 | export_proto(norm2_r8); | |
38 | ||
39 | void | |
40 | norm2_r8 (gfc_array_r8 * const restrict retarray, | |
41 | gfc_array_r8 * const restrict array, | |
42 | const index_type * const restrict pdim) | |
43 | { | |
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_8 * restrict base; | |
49 | GFC_REAL_8 * restrict dest; | |
50 | index_type rank; | |
51 | index_type n; | |
52 | index_type len; | |
53 | index_type delta; | |
54 | index_type dim; | |
55 | int continue_loop; | |
56 | ||
57 | /* Make dim zero based to avoid confusion. */ | |
0cd0559e | 58 | rank = GFC_DESCRIPTOR_RANK (array) - 1; |
cfdf6ff6 TK |
59 | dim = (*pdim) - 1; |
60 | ||
61 | if (unlikely (dim < 0 || dim > rank)) | |
62 | { | |
63 | runtime_error ("Dim argument incorrect in NORM intrinsic: " | |
64 | "is %ld, should be between 1 and %ld", | |
65 | (long int) dim + 1, (long int) rank + 1); | |
66 | } | |
0cd0559e TB |
67 | |
68 | len = GFC_DESCRIPTOR_EXTENT(array,dim); | |
69 | if (len < 0) | |
70 | len = 0; | |
71 | delta = GFC_DESCRIPTOR_STRIDE(array,dim); | |
72 | ||
73 | for (n = 0; n < dim; n++) | |
74 | { | |
75 | sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n); | |
76 | extent[n] = GFC_DESCRIPTOR_EXTENT(array,n); | |
77 | ||
78 | if (extent[n] < 0) | |
79 | extent[n] = 0; | |
80 | } | |
81 | for (n = dim; n < rank; n++) | |
82 | { | |
83 | sstride[n] = GFC_DESCRIPTOR_STRIDE(array, n + 1); | |
84 | extent[n] = GFC_DESCRIPTOR_EXTENT(array, n + 1); | |
85 | ||
86 | if (extent[n] < 0) | |
87 | extent[n] = 0; | |
88 | } | |
89 | ||
21d1335b | 90 | if (retarray->base_addr == NULL) |
0cd0559e TB |
91 | { |
92 | size_t alloc_size, str; | |
93 | ||
94 | for (n = 0; n < rank; n++) | |
95 | { | |
96 | if (n == 0) | |
97 | str = 1; | |
98 | else | |
99 | str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1]; | |
100 | ||
101 | GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str); | |
102 | ||
103 | } | |
104 | ||
105 | retarray->offset = 0; | |
ca708a2b | 106 | retarray->dtype.rank = rank; |
0cd0559e | 107 | |
92e6f3a4 | 108 | alloc_size = GFC_DESCRIPTOR_STRIDE(retarray,rank-1) * extent[rank-1]; |
0cd0559e | 109 | |
92e6f3a4 | 110 | retarray->base_addr = xmallocarray (alloc_size, sizeof (GFC_REAL_8)); |
0cd0559e TB |
111 | if (alloc_size == 0) |
112 | { | |
113 | /* Make sure we have a zero-sized array. */ | |
114 | GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1); | |
115 | return; | |
116 | ||
117 | } | |
0cd0559e TB |
118 | } |
119 | else | |
120 | { | |
121 | if (rank != GFC_DESCRIPTOR_RANK (retarray)) | |
122 | runtime_error ("rank of return array incorrect in" | |
123 | " NORM intrinsic: is %ld, should be %ld", | |
124 | (long int) (GFC_DESCRIPTOR_RANK (retarray)), | |
125 | (long int) rank); | |
126 | ||
127 | if (unlikely (compile_options.bounds_check)) | |
128 | bounds_ifunction_return ((array_t *) retarray, extent, | |
129 | "return value", "NORM"); | |
130 | } | |
131 | ||
132 | for (n = 0; n < rank; n++) | |
133 | { | |
134 | count[n] = 0; | |
135 | dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n); | |
136 | if (extent[n] <= 0) | |
3d2244b9 | 137 | return; |
0cd0559e TB |
138 | } |
139 | ||
21d1335b TB |
140 | base = array->base_addr; |
141 | dest = retarray->base_addr; | |
0cd0559e TB |
142 | |
143 | continue_loop = 1; | |
144 | while (continue_loop) | |
145 | { | |
146 | const GFC_REAL_8 * restrict src; | |
147 | GFC_REAL_8 result; | |
148 | src = base; | |
149 | { | |
150 | ||
151 | GFC_REAL_8 scale; | |
08fd13d4 FXC |
152 | result = 0; |
153 | scale = 1; | |
0cd0559e | 154 | if (len <= 0) |
08fd13d4 | 155 | *dest = 0; |
0cd0559e TB |
156 | else |
157 | { | |
b573f931 | 158 | #if ! defined HAVE_BACK_ARG |
0cd0559e TB |
159 | for (n = 0; n < len; n++, src += delta) |
160 | { | |
b573f931 | 161 | #endif |
0cd0559e | 162 | |
08fd13d4 | 163 | if (*src != 0) |
0cd0559e TB |
164 | { |
165 | GFC_REAL_8 absX, val; | |
08fd13d4 | 166 | absX = MATHFUNC(fabs) (*src); |
0cd0559e TB |
167 | if (scale < absX) |
168 | { | |
169 | val = scale / absX; | |
08fd13d4 | 170 | result = 1 + result * val * val; |
0cd0559e TB |
171 | scale = absX; |
172 | } | |
173 | else | |
174 | { | |
175 | val = absX / scale; | |
176 | result += val * val; | |
177 | } | |
178 | } | |
179 | } | |
08fd13d4 | 180 | result = scale * MATHFUNC(sqrt) (result); |
0cd0559e TB |
181 | *dest = result; |
182 | } | |
183 | } | |
184 | /* Advance to the next element. */ | |
185 | count[0]++; | |
186 | base += sstride[0]; | |
187 | dest += dstride[0]; | |
188 | n = 0; | |
189 | while (count[n] == extent[n]) | |
190 | { | |
191 | /* When we get to the end of a dimension, reset it and increment | |
192 | the next dimension. */ | |
193 | count[n] = 0; | |
194 | /* We could precalculate these products, but this is a less | |
195 | frequently used path so probably not worth it. */ | |
196 | base -= sstride[n] * extent[n]; | |
197 | dest -= dstride[n] * extent[n]; | |
198 | n++; | |
80dd631f | 199 | if (n >= rank) |
0cd0559e | 200 | { |
80dd631f | 201 | /* Break out of the loop. */ |
0cd0559e TB |
202 | continue_loop = 0; |
203 | break; | |
204 | } | |
205 | else | |
206 | { | |
207 | count[n]++; | |
208 | base += sstride[n]; | |
209 | dest += dstride[n]; | |
210 | } | |
211 | } | |
212 | } | |
213 | } | |
214 | ||
215 | #endif |