sysdeps/cris/memcopy.h

   1 /* Copyright (C) 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdeps/generic/memcopy.h>
  20
  21 /* We override the word-copying macros, partly because misalignment in one
  22    pointer isn't cause for a special function, partly because we want to
  23    get rid of wordcopy.c; these macros are only used in memmove.c (and
  24    it's sibling bcopy) since we have arch-specific mempcpy, memcpy and
  25    memset.  */
  26
  27 #undef OP_T_THRES
  28 #define OP_T_THRES OPSIZ
  29
  30 #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes)              \
  31   do                                                                    \
  32     {                                                                   \
  33       unsigned long enddst_bp = dst_bp + nbytes - (nbytes % OPSIZ);     \
  34       nbytes_left = (nbytes % OPSIZ);                                   \
  35       while (dst_bp < (unsigned long) enddst_bp)                        \
  36         {                                                               \
  37           op_t x = *(op_t *) src_bp;                                    \
  38           src_bp += sizeof x;                                           \
  39           *(op_t *) dst_bp = x;                                         \
  40           dst_bp += sizeof x;                                           \
  41         }                                                               \
  42     } while (0)
  43
  44 #define WORD_COPY_BWD(dst_bp, src_bp, nbytes_left, nbytes)              \
  45   do                                                                    \
  46     {                                                                   \
  47       unsigned long enddst_bp = dst_bp - nbytes + (nbytes % OPSIZ);     \
  48       nbytes_left = (nbytes % OPSIZ);                                   \
  49       while (dst_bp > enddst_bp)                                        \
  50         {                                                               \
  51           op_t x;                                                       \
  52           src_bp -= sizeof x;                                           \
  53           x = *(op_t *) src_bp;                                         \
  54           dst_bp -= sizeof x;                                           \
  55           *(op_t *) dst_bp = x;                                         \
  56         }                                                               \
  57     } while (0)