mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 10:00:12 +00:00
97 lines
3.7 KiB
C
97 lines
3.7 KiB
C
/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version.
|
|
Copyright (C) 1991, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Torbjorn Granlund (tege@sics.se).
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <sysdeps/generic/memcopy.h>
|
|
|
|
#if defined(__mc68020__) || defined(mc68020)
|
|
|
|
#undef OP_T_THRES
|
|
#define OP_T_THRES 16
|
|
|
|
/* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020,
|
|
because of its weird instruction overlap characteristics. */
|
|
|
|
#undef WORD_COPY_FWD
|
|
#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
size_t __nwords = (nbytes) / sizeof (op_t); \
|
|
size_t __nblocks = __nwords / 8 + 1; \
|
|
dst_bp -= (8 - __nwords % 8) * sizeof (op_t); \
|
|
src_bp -= (8 - __nwords % 8) * sizeof (op_t); \
|
|
switch (__nwords % 8) \
|
|
do \
|
|
{ \
|
|
((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0]; \
|
|
case 7: \
|
|
((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \
|
|
case 6: \
|
|
((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \
|
|
case 5: \
|
|
((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \
|
|
case 4: \
|
|
((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \
|
|
case 3: \
|
|
((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \
|
|
case 2: \
|
|
((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \
|
|
case 1: \
|
|
((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \
|
|
case 0: \
|
|
src_bp += 32; \
|
|
dst_bp += 32; \
|
|
__nblocks--; \
|
|
} \
|
|
while (__nblocks != 0); \
|
|
(nbytes_left) = (nbytes) % sizeof (op_t); \
|
|
} while (0)
|
|
|
|
#undef WORD_COPY_BWD
|
|
#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
|
|
do \
|
|
{ \
|
|
size_t __nblocks = (nbytes) / 32 + 1; \
|
|
switch ((nbytes) / sizeof (op_t) % 8) \
|
|
do \
|
|
{ \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 7: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 6: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 5: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 4: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 3: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 2: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 1: \
|
|
*--((op_t *) dst_ep) = *--((op_t *) src_ep); \
|
|
case 0: \
|
|
__nblocks--; \
|
|
} \
|
|
while (__nblocks != 0); \
|
|
(nbytes_left) = (nbytes) % sizeof (op_t); \
|
|
} while (0)
|
|
|
|
#endif
|