| /* Generic implementation of the EOSHIFT intrinsic |
| Copyright (C) 2002-2021 Free Software Foundation, Inc. |
| Contributed by Paul Brook <paul@nowt.org> |
| |
| This file is part of the GNU Fortran runtime library (libgfortran). |
| |
| Libgfortran is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public |
| License as published by the Free Software Foundation; either |
| version 3 of the License, or (at your option) any later version. |
| |
| Ligbfortran is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "libgfortran.h" |
| #include <string.h> |
| |
| |
| static void |
| eoshift2 (gfc_array_char *ret, const gfc_array_char *array, |
| index_type shift, const gfc_array_char *bound, int which, |
| const char *filler, index_type filler_len) |
| { |
| /* r.* indicates the return array. */ |
| index_type rstride[GFC_MAX_DIMENSIONS]; |
| index_type rstride0; |
| index_type roffset; |
| char * restrict rptr; |
| char *dest; |
| /* s.* indicates the source array. */ |
| index_type sstride[GFC_MAX_DIMENSIONS]; |
| index_type sstride0; |
| index_type soffset; |
| const char *sptr; |
| const char *src; |
| /* b.* indicates the bound array. */ |
| index_type bstride[GFC_MAX_DIMENSIONS]; |
| index_type bstride0; |
| const char *bptr; |
| |
| index_type count[GFC_MAX_DIMENSIONS]; |
| index_type extent[GFC_MAX_DIMENSIONS]; |
| index_type dim; |
| index_type len; |
| index_type n; |
| index_type arraysize; |
| index_type size; |
| |
| /* The compiler cannot figure out that these are set, initialize |
| them to avoid warnings. */ |
| len = 0; |
| soffset = 0; |
| roffset = 0; |
| |
| size = GFC_DESCRIPTOR_SIZE (array); |
| |
| arraysize = size0 ((array_t *) array); |
| |
| if (ret->base_addr == NULL) |
| { |
| int i; |
| |
| ret->offset = 0; |
| GFC_DTYPE_COPY(ret,array); |
| |
| /* xmallocarray allocates a single byte for zero size. */ |
| ret->base_addr = xmallocarray (arraysize, size); |
| |
| for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++) |
| { |
| index_type ub, str; |
| |
| ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1; |
| |
| if (i == 0) |
| str = 1; |
| else |
| str = GFC_DESCRIPTOR_EXTENT(ret,i-1) |
| * GFC_DESCRIPTOR_STRIDE(ret,i-1); |
| |
| GFC_DIMENSION_SET(ret->dim[i], 0, ub, str); |
| } |
| } |
| else if (unlikely (compile_options.bounds_check)) |
| { |
| bounds_equal_extents ((array_t *) ret, (array_t *) array, |
| "return value", "EOSHIFT"); |
| } |
| |
| if (arraysize == 0) |
| return; |
| |
| which = which - 1; |
| |
| extent[0] = 1; |
| count[0] = 0; |
| sstride[0] = -1; |
| rstride[0] = -1; |
| bstride[0] = -1; |
| n = 0; |
| for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++) |
| { |
| if (dim == which) |
| { |
| roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim); |
| if (roffset == 0) |
| roffset = size; |
| soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim); |
| if (soffset == 0) |
| soffset = size; |
| len = GFC_DESCRIPTOR_EXTENT(array,dim); |
| } |
| else |
| { |
| count[n] = 0; |
| extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim); |
| rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim); |
| sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim); |
| if (bound) |
| bstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(bound,n); |
| else |
| bstride[n] = 0; |
| n++; |
| } |
| } |
| if (sstride[0] == 0) |
| sstride[0] = size; |
| if (rstride[0] == 0) |
| rstride[0] = size; |
| if (bound && bstride[0] == 0) |
| bstride[0] = size; |
| |
| dim = GFC_DESCRIPTOR_RANK (array); |
| rstride0 = rstride[0]; |
| sstride0 = sstride[0]; |
| bstride0 = bstride[0]; |
| rptr = ret->base_addr; |
| sptr = array->base_addr; |
| |
| if ((shift >= 0 ? shift : -shift ) > len) |
| { |
| shift = len; |
| len = 0; |
| } |
| else |
| { |
| if (shift > 0) |
| len = len - shift; |
| else |
| len = len + shift; |
| } |
| |
| if (bound) |
| bptr = bound->base_addr; |
| else |
| bptr = NULL; |
| |
| while (rptr) |
| { |
| /* Do the shift for this dimension. */ |
| if (shift > 0) |
| { |
| src = &sptr[shift * soffset]; |
| dest = rptr; |
| } |
| else |
| { |
| src = sptr; |
| dest = &rptr[-shift * roffset]; |
| } |
| |
| /* If the elements are contiguous, perform a single block move. */ |
| if (soffset == size && roffset == size) |
| { |
| size_t chunk = size * len; |
| memcpy (dest, src, chunk); |
| dest += chunk; |
| } |
| else |
| { |
| for (n = 0; n < len; n++) |
| { |
| memcpy (dest, src, size); |
| dest += roffset; |
| src += soffset; |
| } |
| } |
| if (shift >= 0) |
| { |
| n = shift; |
| } |
| else |
| { |
| dest = rptr; |
| n = -shift; |
| } |
| |
| if (bptr) |
| while (n--) |
| { |
| memcpy (dest, bptr, size); |
| dest += roffset; |
| } |
| else |
| while (n--) |
| { |
| index_type i; |
| |
| if (filler_len == 1) |
| memset (dest, filler[0], size); |
| else |
| for (i = 0; i < size ; i += filler_len) |
| memcpy (&dest[i], filler, filler_len); |
| |
| dest += roffset; |
| } |
| |
| /* Advance to the next section. */ |
| rptr += rstride0; |
| sptr += sstride0; |
| bptr += bstride0; |
| count[0]++; |
| n = 0; |
| while (count[n] == extent[n]) |
| { |
| /* When we get to the end of a dimension, reset it and increment |
| the next dimension. */ |
| count[n] = 0; |
| /* We could precalculate these products, but this is a less |
| frequently used path so probably not worth it. */ |
| rptr -= rstride[n] * extent[n]; |
| sptr -= sstride[n] * extent[n]; |
| bptr -= bstride[n] * extent[n]; |
| n++; |
| if (n >= dim - 1) |
| { |
| /* Break out of the loop. */ |
| rptr = NULL; |
| break; |
| } |
| else |
| { |
| count[n]++; |
| rptr += rstride[n]; |
| sptr += sstride[n]; |
| bptr += bstride[n]; |
| } |
| } |
| } |
| } |
| |
| |
| #define DEFINE_EOSHIFT(N) \ |
| extern void eoshift2_##N (gfc_array_char *, const gfc_array_char *, \ |
| const GFC_INTEGER_##N *, const gfc_array_char *, \ |
| const GFC_INTEGER_##N *); \ |
| export_proto(eoshift2_##N); \ |
| \ |
| void \ |
| eoshift2_##N (gfc_array_char *ret, const gfc_array_char *array, \ |
| const GFC_INTEGER_##N *pshift, const gfc_array_char *pbound, \ |
| const GFC_INTEGER_##N *pdim) \ |
| { \ |
| eoshift2 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \ |
| "\0", 1); \ |
| } \ |
| \ |
| extern void eoshift2_##N##_char (gfc_array_char *, GFC_INTEGER_4, \ |
| const gfc_array_char *, \ |
| const GFC_INTEGER_##N *, \ |
| const gfc_array_char *, \ |
| const GFC_INTEGER_##N *, \ |
| GFC_INTEGER_4, GFC_INTEGER_4); \ |
| export_proto(eoshift2_##N##_char); \ |
| \ |
| void \ |
| eoshift2_##N##_char (gfc_array_char *ret, \ |
| GFC_INTEGER_4 ret_length __attribute__((unused)), \ |
| const gfc_array_char *array, \ |
| const GFC_INTEGER_##N *pshift, \ |
| const gfc_array_char *pbound, \ |
| const GFC_INTEGER_##N *pdim, \ |
| GFC_INTEGER_4 array_length __attribute__((unused)), \ |
| GFC_INTEGER_4 bound_length __attribute__((unused))) \ |
| { \ |
| eoshift2 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \ |
| " ", 1); \ |
| } \ |
| \ |
| extern void eoshift2_##N##_char4 (gfc_array_char *, GFC_INTEGER_4, \ |
| const gfc_array_char *, \ |
| const GFC_INTEGER_##N *, \ |
| const gfc_array_char *, \ |
| const GFC_INTEGER_##N *, \ |
| GFC_INTEGER_4, GFC_INTEGER_4); \ |
| export_proto(eoshift2_##N##_char4); \ |
| \ |
| void \ |
| eoshift2_##N##_char4 (gfc_array_char *ret, \ |
| GFC_INTEGER_4 ret_length __attribute__((unused)), \ |
| const gfc_array_char *array, \ |
| const GFC_INTEGER_##N *pshift, \ |
| const gfc_array_char *pbound, \ |
| const GFC_INTEGER_##N *pdim, \ |
| GFC_INTEGER_4 array_length __attribute__((unused)), \ |
| GFC_INTEGER_4 bound_length __attribute__((unused))) \ |
| { \ |
| static const gfc_char4_t space = (unsigned char) ' '; \ |
| eoshift2 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \ |
| (const char *) &space, \ |
| sizeof (gfc_char4_t)); \ |
| } |
| |
| DEFINE_EOSHIFT (1); |
| DEFINE_EOSHIFT (2); |
| DEFINE_EOSHIFT (4); |
| DEFINE_EOSHIFT (8); |
| #ifdef HAVE_GFC_INTEGER_16 |
| DEFINE_EOSHIFT (16); |
| #endif |