438 lines
12 KiB
C
438 lines
12 KiB
C
/* Generic implementation of the CSHIFT intrinsic
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Copyright 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
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Contributed by Feng Wang <wf_cs@yahoo.com>
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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 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Libgfortran 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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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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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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static void
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cshift0 (gfc_array_char * ret, const gfc_array_char * array,
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ssize_t shift, int which, index_type size)
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{
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/* r.* indicates the return array. */
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index_type rstride[GFC_MAX_DIMENSIONS];
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index_type rstride0;
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index_type roffset;
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char *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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index_type soffset;
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const char *sptr;
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index_type count[GFC_MAX_DIMENSIONS];
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type dim;
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index_type len;
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index_type n;
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index_type arraysize;
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index_type type_size;
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if (which < 1 || which > GFC_DESCRIPTOR_RANK (array))
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runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
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arraysize = size0 ((array_t *) array);
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if (ret->data == NULL)
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{
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int i;
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ret->offset = 0;
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ret->dtype = array->dtype;
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for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
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{
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ret->dim[i].lbound = 0;
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ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
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if (i == 0)
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ret->dim[i].stride = 1;
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else
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ret->dim[i].stride = (ret->dim[i-1].ubound + 1)
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* ret->dim[i-1].stride;
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}
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if (arraysize > 0)
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ret->data = internal_malloc_size (size * arraysize);
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else
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{
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ret->data = internal_malloc_size (1);
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return;
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}
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}
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if (arraysize == 0)
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return;
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type_size = GFC_DTYPE_TYPE_SIZE (array);
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switch(type_size)
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{
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case GFC_DTYPE_LOGICAL_1:
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case GFC_DTYPE_INTEGER_1:
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case GFC_DTYPE_DERIVED_1:
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cshift0_i1 ((gfc_array_i1 *)ret, (gfc_array_i1 *) array, shift, which);
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return;
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case GFC_DTYPE_LOGICAL_2:
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case GFC_DTYPE_INTEGER_2:
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cshift0_i2 ((gfc_array_i2 *)ret, (gfc_array_i2 *) array, shift, which);
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return;
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case GFC_DTYPE_LOGICAL_4:
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case GFC_DTYPE_INTEGER_4:
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cshift0_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array, shift, which);
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return;
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case GFC_DTYPE_LOGICAL_8:
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case GFC_DTYPE_INTEGER_8:
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cshift0_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array, shift, which);
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return;
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#ifdef HAVE_GFC_INTEGER_16
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case GFC_DTYPE_LOGICAL_16:
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case GFC_DTYPE_INTEGER_16:
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cshift0_i16 ((gfc_array_i16 *)ret, (gfc_array_i16 *) array, shift,
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which);
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return;
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#endif
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case GFC_DTYPE_REAL_4:
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cshift0_r4 ((gfc_array_r4 *)ret, (gfc_array_r4 *) array, shift, which);
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return;
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case GFC_DTYPE_REAL_8:
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cshift0_r8 ((gfc_array_r8 *)ret, (gfc_array_r8 *) array, shift, which);
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return;
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#ifdef HAVE_GFC_REAL_10
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case GFC_DTYPE_REAL_10:
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cshift0_r10 ((gfc_array_r10 *)ret, (gfc_array_r10 *) array, shift,
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which);
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return;
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#endif
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#ifdef HAVE_GFC_REAL_16
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case GFC_DTYPE_REAL_16:
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cshift0_r16 ((gfc_array_r16 *)ret, (gfc_array_r16 *) array, shift,
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which);
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return;
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#endif
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case GFC_DTYPE_COMPLEX_4:
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cshift0_c4 ((gfc_array_c4 *)ret, (gfc_array_c4 *) array, shift, which);
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return;
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case GFC_DTYPE_COMPLEX_8:
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cshift0_c8 ((gfc_array_c8 *)ret, (gfc_array_c8 *) array, shift, which);
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return;
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#ifdef HAVE_GFC_COMPLEX_10
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case GFC_DTYPE_COMPLEX_10:
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cshift0_c10 ((gfc_array_c10 *)ret, (gfc_array_c10 *) array, shift,
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which);
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return;
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#endif
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#ifdef HAVE_GFC_COMPLEX_16
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case GFC_DTYPE_COMPLEX_16:
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cshift0_c16 ((gfc_array_c16 *)ret, (gfc_array_c16 *) array, shift,
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which);
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return;
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#endif
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default:
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break;
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}
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switch (size)
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{
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/* Let's check the actual alignment of the data pointers. If they
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are suitably aligned, we can safely call the unpack functions. */
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case sizeof (GFC_INTEGER_1):
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cshift0_i1 ((gfc_array_i1 *) ret, (gfc_array_i1 *) array, shift,
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which);
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break;
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case sizeof (GFC_INTEGER_2):
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if (GFC_UNALIGNED_2(ret->data) || GFC_UNALIGNED_2(array->data))
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break;
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else
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{
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cshift0_i2 ((gfc_array_i2 *) ret, (gfc_array_i2 *) array, shift,
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which);
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return;
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}
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case sizeof (GFC_INTEGER_4):
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if (GFC_UNALIGNED_4(ret->data) || GFC_UNALIGNED_4(array->data))
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break;
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else
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{
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cshift0_i4 ((gfc_array_i4 *)ret, (gfc_array_i4 *) array, shift,
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which);
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return;
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}
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case sizeof (GFC_INTEGER_8):
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if (GFC_UNALIGNED_8(ret->data) || GFC_UNALIGNED_8(array->data))
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{
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/* Let's try to use the complex routines. First, a sanity
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check that the sizes match; this should be optimized to
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a no-op. */
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if (sizeof(GFC_INTEGER_8) != sizeof(GFC_COMPLEX_4))
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break;
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if (GFC_UNALIGNED_C4(ret->data) || GFC_UNALIGNED_C4(array->data))
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break;
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cshift0_c4 ((gfc_array_c4 *) ret, (gfc_array_c4 *) array, shift,
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which);
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return;
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}
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else
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{
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cshift0_i8 ((gfc_array_i8 *)ret, (gfc_array_i8 *) array, shift,
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which);
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return;
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}
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#ifdef HAVE_GFC_INTEGER_16
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case sizeof (GFC_INTEGER_16):
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if (GFC_UNALIGNED_16(ret->data) || GFC_UNALIGNED_16(array->data))
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{
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/* Let's try to use the complex routines. First, a sanity
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check that the sizes match; this should be optimized to
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a no-op. */
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if (sizeof(GFC_INTEGER_16) != sizeof(GFC_COMPLEX_8))
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break;
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if (GFC_UNALIGNED_C8(ret->data) || GFC_UNALIGNED_C8(array->data))
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break;
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cshift0_c8 ((gfc_array_c8 *) ret, (gfc_array_c8 *) array, shift,
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which);
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return;
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}
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else
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{
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cshift0_i16 ((gfc_array_i16 *) ret, (gfc_array_i16 *) array,
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shift, which);
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return;
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}
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#else
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case sizeof (GFC_COMPLEX_8):
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if (GFC_UNALIGNED_C8(ret->data) || GFC_UNALIGNED_C8(array->data))
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break;
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else
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{
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cshift0_c8 ((gfc_array_c8 *) ret, (gfc_array_c8 *) array, shift,
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which);
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return;
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}
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#endif
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default:
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break;
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}
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which = which - 1;
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sstride[0] = 0;
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rstride[0] = 0;
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extent[0] = 1;
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count[0] = 0;
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n = 0;
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/* Initialized for avoiding compiler warnings. */
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roffset = size;
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soffset = size;
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len = 0;
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for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
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{
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if (dim == which)
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{
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roffset = ret->dim[dim].stride * size;
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if (roffset == 0)
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roffset = size;
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soffset = array->dim[dim].stride * size;
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if (soffset == 0)
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soffset = size;
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len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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}
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else
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{
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count[n] = 0;
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extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
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rstride[n] = ret->dim[dim].stride * size;
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sstride[n] = array->dim[dim].stride * size;
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n++;
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}
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}
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if (sstride[0] == 0)
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sstride[0] = size;
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if (rstride[0] == 0)
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rstride[0] = size;
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dim = GFC_DESCRIPTOR_RANK (array);
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rstride0 = rstride[0];
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sstride0 = sstride[0];
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rptr = ret->data;
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sptr = array->data;
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shift = len == 0 ? 0 : shift % (ssize_t)len;
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if (shift < 0)
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shift += len;
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while (rptr)
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{
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/* Do the shift for this dimension. */
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/* If elements are contiguous, perform the operation
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in two block moves. */
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if (soffset == size && roffset == size)
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{
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size_t len1 = shift * size;
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size_t len2 = (len - shift) * size;
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memcpy (rptr, sptr + len1, len2);
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memcpy (rptr + len2, sptr, len1);
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}
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else
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{
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/* Otherwise, we'll have to perform the copy one element at
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a time. */
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char *dest = rptr;
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const char *src = &sptr[shift * soffset];
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for (n = 0; n < len - shift; n++)
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{
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memcpy (dest, src, size);
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dest += roffset;
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src += soffset;
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}
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for (src = sptr, n = 0; n < shift; n++)
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{
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memcpy (dest, src, size);
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dest += roffset;
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src += soffset;
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}
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}
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/* Advance to the next section. */
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rptr += rstride0;
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sptr += sstride0;
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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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rptr -= rstride[n] * extent[n];
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sptr -= sstride[n] * extent[n];
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n++;
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if (n >= dim - 1)
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{
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/* Break out of the loop. */
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rptr = 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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rptr += rstride[n];
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sptr += sstride[n];
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}
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}
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}
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}
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#define DEFINE_CSHIFT(N) \
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extern void cshift0_##N (gfc_array_char *, const gfc_array_char *, \
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const GFC_INTEGER_##N *, const GFC_INTEGER_##N *); \
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export_proto(cshift0_##N); \
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\
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void \
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cshift0_##N (gfc_array_char *ret, const gfc_array_char *array, \
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const GFC_INTEGER_##N *pshift, const GFC_INTEGER_##N *pdim) \
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{ \
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cshift0 (ret, array, *pshift, pdim ? *pdim : 1, \
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GFC_DESCRIPTOR_SIZE (array)); \
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} \
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\
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extern void cshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
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const gfc_array_char *, \
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const GFC_INTEGER_##N *, \
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const GFC_INTEGER_##N *, GFC_INTEGER_4); \
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export_proto(cshift0_##N##_char); \
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\
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void \
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cshift0_##N##_char (gfc_array_char *ret, \
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GFC_INTEGER_4 ret_length __attribute__((unused)), \
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const gfc_array_char *array, \
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const GFC_INTEGER_##N *pshift, \
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const GFC_INTEGER_##N *pdim, \
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GFC_INTEGER_4 array_length) \
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{ \
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cshift0 (ret, array, *pshift, pdim ? *pdim : 1, array_length); \
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} \
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\
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extern void cshift0_##N##_char4 (gfc_array_char *, GFC_INTEGER_4, \
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const gfc_array_char *, \
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const GFC_INTEGER_##N *, \
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const GFC_INTEGER_##N *, GFC_INTEGER_4); \
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export_proto(cshift0_##N##_char4); \
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\
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void \
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cshift0_##N##_char4 (gfc_array_char *ret, \
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GFC_INTEGER_4 ret_length __attribute__((unused)), \
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const gfc_array_char *array, \
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const GFC_INTEGER_##N *pshift, \
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const GFC_INTEGER_##N *pdim, \
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GFC_INTEGER_4 array_length) \
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{ \
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cshift0 (ret, array, *pshift, pdim ? *pdim : 1, \
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array_length * sizeof (gfc_char4_t)); \
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}
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DEFINE_CSHIFT (1);
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DEFINE_CSHIFT (2);
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DEFINE_CSHIFT (4);
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DEFINE_CSHIFT (8);
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#ifdef HAVE_GFC_INTEGER_16
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DEFINE_CSHIFT (16);
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#endif
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