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Roland McGrath
1991-12-08 23:55:00 +00:00
parent 1dd568a93e
commit eb855956fb
1 changed files with 95 additions and 0 deletions
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sysdeps/m68k/memcopy.h Normal file
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/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version.
Copyright (C) 1991 Free Software Foundation, Inc.
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., 675 Mass Ave,
Cambridge, MA 02139, 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) % 32 / sizeof (op_t)) \
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