/* Implementation of the CSHIFT intrinsic. Copyright (C) 2017-2021 Free Software Foundation, Inc. Contributed by Thomas Koenig This file is part of the GNU Fortran 95 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. Libgfortran 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 . */ #include "libgfortran.h" #include #if defined (HAVE_GFC_COMPLEX_4) && defined (HAVE_GFC_INTEGER_4) void cshift1_4_c4 (gfc_array_c4 * const restrict ret, const gfc_array_c4 * const restrict array, const gfc_array_i4 * const restrict h, const GFC_INTEGER_4 * const restrict pwhich) { /* r.* indicates the return array. */ index_type rstride[GFC_MAX_DIMENSIONS]; index_type rstride0; index_type roffset; GFC_COMPLEX_4 *rptr; GFC_COMPLEX_4 *dest; /* s.* indicates the source array. */ index_type sstride[GFC_MAX_DIMENSIONS]; index_type sstride0; index_type soffset; const GFC_COMPLEX_4 *sptr; const GFC_COMPLEX_4 *src; /* h.* indicates the shift array. */ index_type hstride[GFC_MAX_DIMENSIONS]; index_type hstride0; const GFC_INTEGER_4 *hptr; index_type count[GFC_MAX_DIMENSIONS]; index_type extent[GFC_MAX_DIMENSIONS]; index_type rs_ex[GFC_MAX_DIMENSIONS]; index_type ss_ex[GFC_MAX_DIMENSIONS]; index_type hs_ex[GFC_MAX_DIMENSIONS]; index_type dim; index_type len; index_type n; int which; GFC_INTEGER_4 sh; /* Bounds checking etc is already done by the caller. */ if (pwhich) which = *pwhich - 1; else which = 0; extent[0] = 1; count[0] = 0; n = 0; /* Initialized for avoiding compiler warnings. */ roffset = 1; soffset = 1; len = 0; for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++) { if (dim == which) { roffset = GFC_DESCRIPTOR_STRIDE(ret,dim); if (roffset == 0) roffset = 1; soffset = GFC_DESCRIPTOR_STRIDE(array,dim); if (soffset == 0) soffset = 1; len = GFC_DESCRIPTOR_EXTENT(array,dim); } else { count[n] = 0; extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim); rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim); sstride[n] = GFC_DESCRIPTOR_STRIDE(array,dim); hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n); rs_ex[n] = rstride[n] * extent[n]; ss_ex[n] = sstride[n] * extent[n]; hs_ex[n] = hstride[n] * extent[n]; n++; } } if (sstride[0] == 0) sstride[0] = 1; if (rstride[0] == 0) rstride[0] = 1; if (hstride[0] == 0) hstride[0] = 1; dim = GFC_DESCRIPTOR_RANK (array); rstride0 = rstride[0]; sstride0 = sstride[0]; hstride0 = hstride[0]; rptr = ret->base_addr; sptr = array->base_addr; hptr = h->base_addr; while (rptr) { /* Do the shift for this dimension. */ sh = *hptr; /* Normal case should be -len < sh < len; try to avoid the expensive remainder operation if possible. */ if (sh < 0) sh += len; if (unlikely(sh >= len || sh < 0)) { sh = sh % len; if (sh < 0) sh += len; } src = &sptr[sh * soffset]; dest = rptr; if (soffset == 1 && roffset == 1) { size_t len1 = sh * sizeof (GFC_COMPLEX_4); size_t len2 = (len - sh) * sizeof (GFC_COMPLEX_4); memcpy (rptr, sptr + sh, len2); memcpy (rptr + (len - sh), sptr, len1); } else { for (n = 0; n < len - sh; n++) { *dest = *src; dest += roffset; src += soffset; } for (src = sptr, n = 0; n < sh; n++) { *dest = *src; dest += roffset; src += soffset; } } /* Advance to the next section. */ rptr += rstride0; sptr += sstride0; hptr += hstride0; 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; rptr -= rs_ex[n]; sptr -= ss_ex[n]; hptr -= hs_ex[n]; n++; if (n >= dim - 1) { /* Break out of the loop. */ rptr = NULL; break; } else { count[n]++; rptr += rstride[n]; sptr += sstride[n]; hptr += hstride[n]; } } } } #endif