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Diffstat (limited to 'lib/libc/i386/string/swab.S')
| -rw-r--r-- | lib/libc/i386/string/swab.S | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/lib/libc/i386/string/swab.S b/lib/libc/i386/string/swab.S deleted file mode 100644 index 717b7a2..0000000 --- a/lib/libc/i386/string/swab.S +++ /dev/null @@ -1,105 +0,0 @@ -/* - * Copyright (c) 1993,94 Winning Strategies, Inc. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Winning Strategies, Inc. - * 4. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - * $Id$ - */ - -#if defined(LIBC_RCS) && !defined(lint) - .text - .asciz "$Id$" -#endif - -#include "DEFS.h" - -/* - * void - * swab (const void *src, void *dst, size_t len) - * copy len bytes from src to dst, swapping adjacent bytes - * - * On the i486, this code is negligibly faster than the code generated - * by gcc at about half the size. If my i386 databook is correct, it - * should be considerably faster than the gcc code on a i386. - * - * Written by: - * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. - */ - -ENTRY(swab) - pushl %esi - pushl %edi - movl 12(%esp),%esi - movl 16(%esp),%edi - movl 20(%esp),%ecx - - cld # set direction forward - - shrl $1,%ecx - testl $7,%ecx # copy first group of 1 to 7 words - jz L2 # while swaping alternate bytes. - .align 2,0x90 -L1: lodsw - rorw $8,%ax - stosw - decl %ecx - testl $7,%ecx - jnz L1 - -L2: shrl $3,%ecx # copy remainder 8 words at a time - jz L4 # while swapping alternate bytes. - .align 2,0x90 -L3: lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - lodsw - rorw $8,%ax - stosw - decl %ecx - jnz L3 - -L4: popl %edi - popl %esi - ret |
