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/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version.
Copyright (C) 1991-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <sysdeps/generic/memcopy.h>
#if defined(__mc68020__) || defined(mc68020)
/* 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]; \
/* Fall through. */ \
case 7: \
((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \
/* Fall through. */ \
case 6: \
((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \
/* Fall through. */ \
case 5: \
((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \
/* Fall through. */ \
case 4: \
((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \
/* Fall through. */ \
case 3: \
((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \
/* Fall through. */ \
case 2: \
((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \
/* Fall through. */ \
case 1: \
((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \
/* Fall through. */ \
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; \
op_t *__dst_ep = (op_t *) (dst_ep); \
op_t *__src_ep = (op_t *) (src_ep); \
switch ((nbytes) / sizeof (op_t) % 8) \
do \
{ \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 7: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 6: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 5: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 4: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 3: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 2: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 1: \
*--__dst_ep = *--__src_ep; \
/* Fall through. */ \
case 0: \
__nblocks--; \
} \
while (__nblocks != 0); \
(nbytes_left) = (nbytes) % sizeof (op_t); \
(dst_ep) = (unsigned long) __dst_ep; \
(src_ep) = (unsigned long) __src_ep; \
} while (0)
#endif
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