libgfortran/generated/pack_c8.c

   1 /* Specific implementation of the PACK intrinsic
   2    Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 95 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 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.
  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"
  27 #include <stdlib.h>
  28 #include <assert.h>
  29 #include <string.h>
  30
  31
  32 #if defined (HAVE_GFC_COMPLEX_8)
  33
  34 /* PACK is specified as follows:
  35
  36    13.14.80 PACK (ARRAY, MASK, [VECTOR])
  37
  38    Description: Pack an array into an array of rank one under the
  39    control of a mask.
  40
  41    Class: Transformational function.
  42
  43    Arguments:
  44       ARRAY   may be of any type. It shall not be scalar.
  45       MASK    shall be of type LOGICAL. It shall be conformable with ARRAY.
  46       VECTOR  (optional) shall be of the same type and type parameters
  47               as ARRAY. VECTOR shall have at least as many elements as
  48               there are true elements in MASK. If MASK is a scalar
  49               with the value true, VECTOR shall have at least as many
  50               elements as there are in ARRAY.
  51
  52    Result Characteristics: The result is an array of rank one with the
  53    same type and type parameters as ARRAY. If VECTOR is present, the
  54    result size is that of VECTOR; otherwise, the result size is the
  55    number /t/ of true elements in MASK unless MASK is scalar with the
  56    value true, in which case the result size is the size of ARRAY.
  57
  58    Result Value: Element /i/ of the result is the element of ARRAY
  59    that corresponds to the /i/th true element of MASK, taking elements
  60    in array element order, for /i/ = 1, 2, ..., /t/. If VECTOR is
  61    present and has size /n/ > /t/, element /i/ of the result has the
  62    value VECTOR(/i/), for /i/ = /t/ + 1, ..., /n/.
  63
  64    Examples: The nonzero elements of an array M with the value
  65    | 0 0 0 |
  66    | 9 0 0 | may be "gathered" by the function PACK. The result of
  67    | 0 0 7 |
  68    PACK (M, MASK = M.NE.0) is [9,7] and the result of PACK (M, M.NE.0,
  69    VECTOR = (/ 2,4,6,8,10,12 /)) is [9,7,6,8,10,12].
  70
  71 There are two variants of the PACK intrinsic: one, where MASK is
  72 array valued, and the other one where MASK is scalar.  */
  73
  74 void
  75 pack_c8 (gfc_array_c8 *ret, const gfc_array_c8 *array,
  76                const gfc_array_l1 *mask, const gfc_array_c8 *vector)
  77 {
  78   /* r.* indicates the return array.  */
  79   index_type rstride0;
  80   GFC_COMPLEX_8 * restrict rptr;
  81   /* s.* indicates the source array.  */
  82   index_type sstride[GFC_MAX_DIMENSIONS];
  83   index_type sstride0;
  84   const GFC_COMPLEX_8 *sptr;
  85   /* m.* indicates the mask array.  */
  86   index_type mstride[GFC_MAX_DIMENSIONS];
  87   index_type mstride0;
  88   const GFC_LOGICAL_1 *mptr;
  89
  90   index_type count[GFC_MAX_DIMENSIONS];
  91   index_type extent[GFC_MAX_DIMENSIONS];
  92   int zero_sized;
  93   index_type n;
  94   index_type dim;
  95   index_type nelem;
  96   index_type total;
  97   int mask_kind;
  98
  99   dim = GFC_DESCRIPTOR_RANK (array);
 100
 101   mptr = mask->data;
 102
 103   /* Use the same loop for all logical types, by using GFC_LOGICAL_1
 104      and using shifting to address size and endian issues.  */
 105
 106   mask_kind = GFC_DESCRIPTOR_SIZE (mask);
 107
 108   if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
 109 #ifdef HAVE_GFC_LOGICAL_16
 110       || mask_kind == 16
 111 #endif
 112       )
 113     {
 114       /*  Do not convert a NULL pointer as we use test for NULL below.  */
 115       if (mptr)
 116         mptr = GFOR_POINTER_TO_L1 (mptr, mask_kind);
 117     }
 118   else
 119     runtime_error ("Funny sized logical array");
 120
 121   zero_sized = 0;
 122   for (n = 0; n < dim; n++)
 123     {
 124       count[n] = 0;
 125       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
 126       if (extent[n] <= 0)
 127        zero_sized = 1;
 128       sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
 129       mstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(mask,n);
 130     }
 131   if (sstride[0] == 0)
 132     sstride[0] = 1;
 133   if (mstride[0] == 0)
 134     mstride[0] = mask_kind;
 135
 136   if (zero_sized)
 137     sptr = NULL;
 138   else
 139     sptr = array->data;
 140
 141   if (ret->data == NULL || unlikely (compile_options.bounds_check))
 142     {
 143       /* Count the elements, either for allocating memory or
 144          for bounds checking.  */
 145
 146       if (vector != NULL)
 147         {
 148           /* The return array will have as many
 149              elements as there are in VECTOR.  */
 150           total = GFC_DESCRIPTOR_EXTENT(vector,0);
 151           if (total < 0)
 152             {
 153               total = 0;
 154               vector = NULL;
 155             }
 156         }
 157       else
 158         {
 159           /* We have to count the true elements in MASK.  */
 160           total = count_0 (mask);
 161         }
 162
 163       if (ret->data == NULL)
 164         {
 165           /* Setup the array descriptor.  */
 166           GFC_DIMENSION_SET(ret->dim[0], 0, total-1, 1);
 167
 168           ret->offset = 0;
 169           if (total == 0)
 170             {
 171               /* In this case, nothing remains to be done.  */
 172               ret->data = internal_malloc_size (1);
 173               return;
 174             }
 175           else
 176             ret->data = internal_malloc_size (sizeof (GFC_COMPLEX_8) * total);
 177         }
 178       else
 179         {
 180           /* We come here because of range checking.  */
 181           index_type ret_extent;
 182
 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);
 188         }
 189     }
 190
 191   rstride0 = GFC_DESCRIPTOR_STRIDE(ret,0);
 192   if (rstride0 == 0)
 193     rstride0 = 1;
 194   sstride0 = sstride[0];
 195   mstride0 = mstride[0];
 196   rptr = ret->data;
 197
 198   while (sptr && mptr)
 199     {
 200       /* Test this element.  */
 201       if (*mptr)
 202         {
 203           /* Add it.  */
 204           *rptr = *sptr;
 205           rptr += rstride0;
 206         }
 207       /* Advance to the next element.  */
 208       sptr += sstride0;
 209       mptr += mstride0;
 210       count[0]++;
 211       n = 0;
 212       while (count[n] == extent[n])
 213         {
 214           /* When we get to the end of a dimension, reset it and increment
 215              the next dimension.  */
 216           count[n] = 0;
 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];
 221           n++;
 222           if (n >= dim)
 223             {
 224               /* Break out of the loop.  */
 225               sptr = NULL;
 226               break;
 227             }
 228           else
 229             {
 230               count[n]++;
 231               sptr += sstride[n];
 232               mptr += mstride[n];
 233             }
 234         }
 235     }
 236
 237   /* Add any remaining elements from VECTOR.  */
 238   if (vector)
 239     {
 240       n = GFC_DESCRIPTOR_EXTENT(vector,0);
 241       nelem = ((rptr - ret->data) / rstride0);
 242       if (n > nelem)
 243         {
 244           sstride0 = GFC_DESCRIPTOR_STRIDE(vector,0);
 245           if (sstride0 == 0)
 246             sstride0 = 1;
 247
 248           sptr = vector->data + sstride0 * nelem;
 249           n -= nelem;
 250           while (n--)
 251             {
 252               *rptr = *sptr;
 253               rptr += rstride0;
 254               sptr += sstride0;
 255             }
 256         }
 257     }
 258 }
 259
 260 #endif
 261