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jeremybenn |
/* Generic implementation of the EOSHIFT intrinsic
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Copyright 2002, 2005, 2007, 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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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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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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/* TODO: make this work for large shifts when
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sizeof(int) < sizeof (index_type). */
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static void
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eoshift0 (gfc_array_char * ret, const gfc_array_char * array,
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int shift, const char * pbound, int which, index_type size,
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const char *filler, index_type filler_len)
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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 * restrict rptr;
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char *dest;
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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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const char *src;
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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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/* The compiler cannot figure out that these are set, initialize
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them to avoid warnings. */
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len = 0;
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soffset = 0;
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roffset = 0;
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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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index_type ub, str;
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ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
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if (i == 0)
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str = 1;
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else
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str = GFC_DESCRIPTOR_EXTENT(ret,i-1)
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* GFC_DESCRIPTOR_STRIDE(ret,i-1);
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GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
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}
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/* internal_malloc_size allocates a single byte for zero size. */
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ret->data = internal_malloc_size (size * arraysize);
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}
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else if (unlikely (compile_options.bounds_check))
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{
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bounds_equal_extents ((array_t *) ret, (array_t *) array,
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"return value", "EOSHIFT");
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}
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if (arraysize == 0)
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return;
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which = which - 1;
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extent[0] = 1;
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count[0] = 0;
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sstride[0] = -1;
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rstride[0] = -1;
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n = 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 = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
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if (roffset == 0)
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roffset = size;
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soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
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if (soffset == 0)
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soffset = size;
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len = GFC_DESCRIPTOR_EXTENT(array,dim);
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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] = GFC_DESCRIPTOR_EXTENT(array,dim);
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rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
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sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
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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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if ((shift >= 0 ? shift : -shift) > len)
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{
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shift = len;
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len = 0;
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}
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else
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{
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if (shift > 0)
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len = len - shift;
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else
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len = len + shift;
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}
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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 (shift > 0)
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{
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src = &sptr[shift * soffset];
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dest = rptr;
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}
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else
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{
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src = sptr;
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dest = &rptr[-shift * roffset];
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}
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for (n = 0; n < len; 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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if (shift >= 0)
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{
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n = shift;
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}
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else
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{
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dest = rptr;
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n = -shift;
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}
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if (pbound)
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while (n--)
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{
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memcpy (dest, pbound, size);
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dest += roffset;
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}
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else
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while (n--)
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{
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index_type i;
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if (filler_len == 1)
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memset (dest, filler[0], size);
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else
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for (i = 0; i < size ; i += filler_len)
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memcpy (&dest[i], filler, filler_len);
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dest += roffset;
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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_EOSHIFT(N) \
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extern void eoshift0_##N (gfc_array_char *, const gfc_array_char *, \
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const GFC_INTEGER_##N *, const char *, \
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const GFC_INTEGER_##N *); \
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export_proto(eoshift0_##N); \
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\
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void \
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eoshift0_##N (gfc_array_char *ret, const gfc_array_char *array, \
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const GFC_INTEGER_##N *pshift, const char *pbound, \
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const GFC_INTEGER_##N *pdim) \
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{ \
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eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
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GFC_DESCRIPTOR_SIZE (array), "\0", 1); \
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} \
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\
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extern void eoshift0_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
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const gfc_array_char *, \
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const GFC_INTEGER_##N *, const char *, \
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const GFC_INTEGER_##N *, GFC_INTEGER_4, \
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GFC_INTEGER_4); \
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export_proto(eoshift0_##N##_char); \
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\
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void \
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eoshift0_##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 char *pbound, \
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const GFC_INTEGER_##N *pdim, \
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GFC_INTEGER_4 array_length, \
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GFC_INTEGER_4 bound_length __attribute__((unused))) \
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{ \
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eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
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array_length, " ", 1); \
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} \
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\
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extern void eoshift0_##N##_char4 (gfc_array_char *, GFC_INTEGER_4, \
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const gfc_array_char *, \
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const GFC_INTEGER_##N *, const char *, \
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const GFC_INTEGER_##N *, GFC_INTEGER_4, \
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GFC_INTEGER_4); \
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export_proto(eoshift0_##N##_char4); \
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\
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void \
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eoshift0_##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 char *pbound, \
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const GFC_INTEGER_##N *pdim, \
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GFC_INTEGER_4 array_length, \
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GFC_INTEGER_4 bound_length __attribute__((unused))) \
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{ \
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static const gfc_char4_t space = (unsigned char) ' '; \
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eoshift0 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
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array_length * sizeof (gfc_char4_t), (const char *) &space, \
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sizeof (gfc_char4_t)); \
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}
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DEFINE_EOSHIFT (1);
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DEFINE_EOSHIFT (2);
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DEFINE_EOSHIFT (4);
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DEFINE_EOSHIFT (8);
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#ifdef HAVE_GFC_INTEGER_16
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DEFINE_EOSHIFT (16);
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#endif
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