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- /* memcopy.h -- definitions for memory copy functions. Motorola 68020 version.
- Copyright (C) 1991-2019 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 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
- <http://www.gnu.org/licenses/>. */
- #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; \
- 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; \
- case 7: \
- *--__dst_ep = *--__src_ep; \
- case 6: \
- *--__dst_ep = *--__src_ep; \
- case 5: \
- *--__dst_ep = *--__src_ep; \
- case 4: \
- *--__dst_ep = *--__src_ep; \
- case 3: \
- *--__dst_ep = *--__src_ep; \
- case 2: \
- *--__dst_ep = *--__src_ep; \
- case 1: \
- *--__dst_ep = *--__src_ep; \
- 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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