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Definitions for efficient copying on CRIS.

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This commit is contained in:
Ulrich Drepper 2001-04-10 00:23:12 +00:00
parent 9c266efdcd
commit e9ca92e3b2
1 changed files with 57 additions and 0 deletions
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sysdeps/cris/memcopy.h Normal file
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/* Copyright (C) 2001 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 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>
/* We override the word-copying macros, partly because misalignment in one
pointer isn't cause for a special function, partly because we want to
get rid of wordcopy.c; these macros are only used in memmove.c (and
it's sibling bcopy) since we have arch-specific mempcpy, memcpy and
memset. */
#undef OP_T_THRES
#define OP_T_THRES OPSIZ
#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
do \
{ \
unsigned long enddst_bp = dst_bp + nbytes - (nbytes % OPSIZ); \
nbytes_left = (nbytes % OPSIZ); \
while (dst_bp < (unsigned long) enddst_bp) \
{ \
op_t x = *(op_t *) src_bp; \
src_bp += sizeof x; \
*(op_t *) dst_bp = x; \
dst_bp += sizeof x; \
} \
} while (0)
#define WORD_COPY_BWD(dst_bp, src_bp, nbytes_left, nbytes) \
do \
{ \
unsigned long enddst_bp = dst_bp - nbytes + (nbytes % OPSIZ); \
nbytes_left = (nbytes % OPSIZ); \
while (dst_bp > enddst_bp) \
{ \
op_t x; \
src_bp -= sizeof x; \
x = *(op_t *) src_bp; \
dst_bp -= sizeof x; \
*(op_t *) dst_bp = x; \
} \
} while (0)