316 lines
9.0 KiB
C
316 lines
9.0 KiB
C
/* Specific implementation of the PACK intrinsic
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Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Ligbfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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#if defined (HAVE_GFC_INTEGER_16)
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/* PACK is specified as follows:
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13.14.80 PACK (ARRAY, MASK, [VECTOR])
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Description: Pack an array into an array of rank one under the
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control of a mask.
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Class: Transformational function.
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Arguments:
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ARRAY may be of any type. It shall not be scalar.
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MASK shall be of type LOGICAL. It shall be conformable with ARRAY.
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VECTOR (optional) shall be of the same type and type parameters
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as ARRAY. VECTOR shall have at least as many elements as
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there are true elements in MASK. If MASK is a scalar
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with the value true, VECTOR shall have at least as many
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elements as there are in ARRAY.
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Result Characteristics: The result is an array of rank one with the
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same type and type parameters as ARRAY. If VECTOR is present, the
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result size is that of VECTOR; otherwise, the result size is the
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number /t/ of true elements in MASK unless MASK is scalar with the
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value true, in which case the result size is the size of ARRAY.
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Result Value: Element /i/ of the result is the element of ARRAY
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that corresponds to the /i/th true element of MASK, taking elements
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in array element order, for /i/ = 1, 2, ..., /t/. If VECTOR is
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present and has size /n/ > /t/, element /i/ of the result has the
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value VECTOR(/i/), for /i/ = /t/ + 1, ..., /n/.
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Examples: The nonzero elements of an array M with the value
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| 0 0 0 |
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| 9 0 0 | may be "gathered" by the function PACK. The result of
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| 0 0 7 |
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PACK (M, MASK = M.NE.0) is [9,7] and the result of PACK (M, M.NE.0,
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VECTOR = (/ 2,4,6,8,10,12 /)) is [9,7,6,8,10,12].
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There are two variants of the PACK intrinsic: one, where MASK is
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array valued, and the other one where MASK is scalar. */
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void
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pack_i16 (gfc_array_i16 *ret, const gfc_array_i16 *array,
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const gfc_array_l1 *mask, const gfc_array_i16 *vector)
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{
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/* r.* indicates the return array. */
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index_type rstride0;
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GFC_INTEGER_16 * restrict rptr;
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/* s.* indicates the source array. */
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index_type sstride[GFC_MAX_DIMENSIONS];
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index_type sstride0;
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const GFC_INTEGER_16 *sptr;
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/* m.* indicates the mask array. */
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index_type mstride[GFC_MAX_DIMENSIONS];
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index_type mstride0;
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const GFC_LOGICAL_1 *mptr;
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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int zero_sized;
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index_type n;
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index_type dim;
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index_type nelem;
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index_type total;
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int mask_kind;
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dim = GFC_DESCRIPTOR_RANK (array);
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mptr = mask->data;
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/* Use the same loop for all logical types, by using GFC_LOGICAL_1
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and using shifting to address size and endian issues. */
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mask_kind = GFC_DESCRIPTOR_SIZE (mask);
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if (mask_kind == 1 || mask_kind == 2 || mask_kind == 4 || mask_kind == 8
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#ifdef HAVE_GFC_LOGICAL_16
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|| mask_kind == 16
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#endif
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)
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{
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/* Do not convert a NULL pointer as we use test for NULL below. */
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if (mptr)
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mptr = GFOR_POINTER_TO_L1 (mptr, mask_kind);
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}
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else
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runtime_error ("Funny sized logical array");
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zero_sized = 0;
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for (n = 0; n < dim; n++)
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{
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count[n] = 0;
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extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
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if (extent[n] <= 0)
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zero_sized = 1;
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sstride[n] = array->dim[n].stride;
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mstride[n] = mask->dim[n].stride * mask_kind;
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}
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if (sstride[0] == 0)
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sstride[0] = 1;
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if (mstride[0] == 0)
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mstride[0] = mask_kind;
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if (zero_sized)
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sptr = NULL;
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else
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sptr = array->data;
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if (ret->data == NULL || compile_options.bounds_check)
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{
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/* Count the elements, either for allocating memory or
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for bounds checking. */
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if (vector != NULL)
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{
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/* The return array will have as many
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elements as there are in VECTOR. */
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total = vector->dim[0].ubound + 1 - vector->dim[0].lbound;
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if (total < 0)
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{
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total = 0;
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vector = NULL;
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}
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}
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else
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{
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/* We have to count the true elements in MASK. */
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/* TODO: We could speed up pack easily in the case of only
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few .TRUE. entries in MASK, by keeping track of where we
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would be in the source array during the initial traversal
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of MASK, and caching the pointers to those elements. Then,
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supposed the number of elements is small enough, we would
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only have to traverse the list, and copy those elements
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into the result array. In the case of datatypes which fit
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in one of the integer types we could also cache the
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value instead of a pointer to it.
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This approach might be bad from the point of view of
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cache behavior in the case where our cache is not big
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enough to hold all elements that have to be copied. */
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const GFC_LOGICAL_1 *m = mptr;
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total = 0;
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if (zero_sized)
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m = NULL;
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while (m)
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{
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/* Test this element. */
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if (*m)
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total++;
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/* Advance to the next element. */
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m += mstride[0];
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count[0]++;
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n = 0;
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while (count[n] == extent[n])
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{
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/* When we get to the end of a dimension, reset it
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and increment the next dimension. */
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count[n] = 0;
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/* We could precalculate this product, but this is a
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less frequently used path so probably not worth
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it. */
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m -= mstride[n] * extent[n];
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n++;
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if (n >= dim)
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{
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/* Break out of the loop. */
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m = NULL;
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break;
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}
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else
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{
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count[n]++;
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m += mstride[n];
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}
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}
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}
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}
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if (ret->data == NULL)
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{
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/* Setup the array descriptor. */
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ret->dim[0].lbound = 0;
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ret->dim[0].ubound = total - 1;
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ret->dim[0].stride = 1;
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ret->offset = 0;
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if (total == 0)
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{
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/* In this case, nothing remains to be done. */
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ret->data = internal_malloc_size (1);
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return;
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}
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else
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ret->data = internal_malloc_size (sizeof (GFC_INTEGER_16) * total);
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}
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else
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{
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/* We come here because of range checking. */
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index_type ret_extent;
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ret_extent = ret->dim[0].ubound + 1 - ret->dim[0].lbound;
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if (total != ret_extent)
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runtime_error ("Incorrect extent in return value of PACK intrinsic;"
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" is %ld, should be %ld", (long int) total,
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(long int) ret_extent);
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}
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}
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rstride0 = ret->dim[0].stride;
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if (rstride0 == 0)
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rstride0 = 1;
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sstride0 = sstride[0];
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mstride0 = mstride[0];
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rptr = ret->data;
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while (sptr && mptr)
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{
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/* Test this element. */
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if (*mptr)
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{
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/* Add it. */
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*rptr = *sptr;
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rptr += rstride0;
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}
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/* Advance to the next element. */
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sptr += sstride0;
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mptr += mstride0;
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count[0]++;
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n = 0;
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while (count[n] == extent[n])
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{
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/* When we get to the end of a dimension, reset it and increment
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the next dimension. */
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count[n] = 0;
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/* We could precalculate these products, but this is a less
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frequently used path so probably not worth it. */
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sptr -= sstride[n] * extent[n];
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mptr -= mstride[n] * extent[n];
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n++;
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if (n >= dim)
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{
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/* Break out of the loop. */
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sptr = NULL;
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break;
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}
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else
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{
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count[n]++;
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sptr += sstride[n];
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mptr += mstride[n];
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}
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}
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}
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/* Add any remaining elements from VECTOR. */
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if (vector)
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{
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n = vector->dim[0].ubound + 1 - vector->dim[0].lbound;
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nelem = ((rptr - ret->data) / rstride0);
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if (n > nelem)
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{
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sstride0 = vector->dim[0].stride;
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if (sstride0 == 0)
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sstride0 = 1;
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sptr = vector->data + sstride0 * nelem;
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n -= nelem;
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while (n--)
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{
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*rptr = *sptr;
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rptr += rstride0;
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sptr += sstride0;
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}
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}
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}
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}
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#endif
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