bmove_upp.c
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上传日期:2022-05-23
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- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* File : bmove.c
- Author : Michael widenius
- Updated: 1987-03-20
- Defines: bmove_upp()
- bmove_upp(dst, src, len) moves exactly "len" bytes from the source
- "src-len" to the destination "dst-len" counting downwards.
- */
- #include <my_global.h>
- #include "m_string.h"
- #if defined(MC68000) && defined(DS90)
- /* 0 <= len <= 65535 */
- void bmove_upp(byte *dst, const byte *src,uint len)
- {
- asm(" movl 12(a7),d0 ");
- asm(" subql #1,d0 ");
- asm(" blt .L5 ");
- asm(" movl 4(a7),a1 ");
- asm(" movl 8(a7),a0 ");
- asm(".L4: movb -(a0),-(a1) ");
- asm(" dbf d0,.L4 ");
- asm(".L5: ");
- }
- #else
- void bmove_upp(register char *dst, register const char *src, register uint len)
- {
- while (len-- != 0) *--dst = *--src;
- }
- #endif