1 `/* Specific implementation of the PACK intrinsic
2 Copyright (C) 2002-2024 Free Software Foundation, Inc.
3 Contributed by Paul Brook <paul@nowt.org>
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 Ligbfortran 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"
31 `#if defined (HAVE_'rtype_name`)
33 /* PACK is specified as follows:
35 13.14.80 PACK (ARRAY, MASK, [VECTOR])
37 Description: Pack an array into an array of rank one under the
40 Class: Transformational function.
43 ARRAY may be of any type. It shall not be scalar.
44 MASK shall be of type LOGICAL. It shall be conformable with ARRAY.
45 VECTOR (optional) shall be of the same type and type parameters
46 as ARRAY. VECTOR shall have at least as many elements as
47 there are true elements in MASK. If MASK is a scalar
48 with the value true, VECTOR shall have at least as many
49 elements as there are in ARRAY.
51 Result Characteristics: The result is an array of rank one with the
52 same type and type parameters as ARRAY. If VECTOR is present, the
53 result size is that of VECTOR; otherwise, the result size is the
54 number /t/ of true elements in MASK unless MASK is scalar with the
55 value true, in which case the result size is the size of ARRAY.
57 Result Value: Element /i/ of the result is the element of ARRAY
58 that corresponds to the /i/th true element of MASK, taking elements
59 in array element order, for /i/ = 1, 2, ..., /t/. If VECTOR is
60 present and has size /n/ > /t/, element /i/ of the result has the
61 value VECTOR(/i/), for /i/ = /t/ + 1, ..., /n/.
63 Examples: The nonzero elements of an array M with the value
65 | 9 0 0 | may be "gathered" by the function PACK. The result of
67 PACK (M, MASK = M.NE.0) is [9,7] and the result of PACK (M, M.NE.0,
68 VECTOR = (/ 2,4,6,8,10,12 /)) is [9,7,6,8,10,12].
70 There are two variants of the PACK intrinsic: one, where MASK is
71 array valued, and the other one where MASK is scalar. */
74 pack_'rtype_code` ('rtype` *ret, const 'rtype` *array,
75 const gfc_array_l1 *mask, const 'rtype` *vector)
77 /* r.* indicates the return array. */
79 'rtype_name` * restrict rptr;
80 /* s.* indicates the source array. */
81 index_type sstride[GFC_MAX_DIMENSIONS];
83 const 'rtype_name` *sptr;
84 /* m.* indicates the mask array. */
85 index_type mstride[GFC_MAX_DIMENSIONS];
87 const GFC_LOGICAL_1 *mptr;
89 index_type count[GFC_MAX_DIMENSIONS];
90 index_type extent[GFC_MAX_DIMENSIONS];
98 dim = GFC_DESCRIPTOR_RANK (array);
100 sstride[0] = 0; /* Avoid warnings if not initialized. */
103 mptr = mask->base_addr;
105 /* Use the same loop for all logical types, by using GFC_LOGICAL_1
106 and using shifting to address size and endian issues. */
108 mask_kind = GFC_DESCRIPTOR_SIZE (mask);
110 if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
111 #ifdef HAVE_GFC_LOGICAL_16
116 /* Do not convert a NULL pointer as we use test for NULL below. */
118 mptr = GFOR_POINTER_TO_L1 (mptr, mask_kind);
121 runtime_error ("Funny sized logical array");
124 for (n = 0; n < dim; n++)
127 extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
130 sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
131 mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);
136 mstride[0] = mask_kind;
141 sptr = array->base_addr;
143 if (ret->base_addr == NULL || unlikely (compile_options.bounds_check))
145 /* Count the elements, either for allocating memory or
146 for bounds checking. */
150 /* The return array will have as many
151 elements as there are in VECTOR. */
152 total = GFC_DESCRIPTOR_EXTENT(vector,0);
161 /* We have to count the true elements in MASK. */
162 total = count_0 (mask);
165 if (ret->base_addr == NULL)
167 /* Setup the array descriptor. */
168 GFC_DIMENSION_SET(ret->dim[0], 0, total-1, 1);
172 /* xmallocarray allocates a single byte for zero size. */
173 ret->base_addr = xmallocarray (total, sizeof ('rtype_name`));
180 /* We come here because of range checking. */
181 index_type ret_extent;
183 ret_extent = GFC_DESCRIPTOR_EXTENT(ret,0);
184 if (total != ret_extent)
185 runtime_error ("Incorrect extent in return value of PACK intrinsic;"
186 " is %ld, should be %ld", (long int) total,
187 (long int) ret_extent);
191 rstride0 = GFC_DESCRIPTOR_STRIDE(ret,0);
194 sstride0 = sstride[0];
195 mstride0 = mstride[0];
196 rptr = ret->base_addr;
200 /* Test this element. */
207 /* Advance to the next element. */
212 while (count[n] == extent[n])
214 /* When we get to the end of a dimension, reset it and increment
215 the next dimension. */
217 /* We could precalculate these products, but this is a less
218 frequently used path so probably not worth it. */
219 sptr -= sstride[n] * extent[n];
220 mptr -= mstride[n] * extent[n];
224 /* Break out of the loop. */
237 /* Add any remaining elements from VECTOR. */
240 n = GFC_DESCRIPTOR_EXTENT(vector,0);
241 nelem = ((rptr - ret->base_addr) / rstride0);
244 sstride0 = GFC_DESCRIPTOR_STRIDE(vector,0);
248 sptr = vector->base_addr + sstride0 * nelem;