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112 lines
4.2 KiB
C
112 lines
4.2 KiB
C
/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version.
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Copyright (C) 1991-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/memcopy.h>
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#if defined(__mc68020__) || defined(mc68020)
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/* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020,
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because of its weird instruction overlap characteristics. */
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#undef WORD_COPY_FWD
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#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
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do \
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{ \
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size_t __nwords = (nbytes) / sizeof (op_t); \
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size_t __nblocks = __nwords / 8 + 1; \
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dst_bp -= (8 - __nwords % 8) * sizeof (op_t); \
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src_bp -= (8 - __nwords % 8) * sizeof (op_t); \
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switch (__nwords % 8) \
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do \
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{ \
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((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0]; \
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/* Fall through. */ \
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case 7: \
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((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \
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/* Fall through. */ \
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case 6: \
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((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \
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/* Fall through. */ \
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case 5: \
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((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \
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/* Fall through. */ \
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case 4: \
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((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \
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/* Fall through. */ \
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case 3: \
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((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \
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/* Fall through. */ \
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case 2: \
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((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \
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/* Fall through. */ \
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case 1: \
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((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \
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/* Fall through. */ \
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case 0: \
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src_bp += 32; \
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dst_bp += 32; \
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__nblocks--; \
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} \
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while (__nblocks != 0); \
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(nbytes_left) = (nbytes) % sizeof (op_t); \
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} while (0)
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#undef WORD_COPY_BWD
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#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
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do \
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{ \
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size_t __nblocks = (nbytes) / 32 + 1; \
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op_t *__dst_ep = (op_t *) (dst_ep); \
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op_t *__src_ep = (op_t *) (src_ep); \
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switch ((nbytes) / sizeof (op_t) % 8) \
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do \
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{ \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 7: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 6: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 5: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 4: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 3: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 2: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 1: \
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*--__dst_ep = *--__src_ep; \
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/* Fall through. */ \
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case 0: \
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__nblocks--; \
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} \
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while (__nblocks != 0); \
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(nbytes_left) = (nbytes) % sizeof (op_t); \
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(dst_ep) = (unsigned long) __dst_ep; \
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(src_ep) = (unsigned long) __src_ep; \
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} while (0)
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#endif
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