1/*
2 * Copyright (c) 1993,94 Winning Strategies, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
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24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <machine/asm.h>
32__FBSDID("$FreeBSD: head/lib/libc/i386/string/swab.S 184548 2008-11-02 01:28:47Z peter $");
33
34/*
35 * void
36 * swab (const void *src, void *dst, size_t len)
37 * copy len bytes from src to dst, swapping adjacent bytes
38 *
39 * On the i486, this code is negligibly faster than the code generated
40 * by gcc at about half the size. If my i386 databook is correct, it
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92 rorw $8,%ax
93 stosw
94 decl %ecx
95 jnz L3
96
97L4: popl %edi
98 popl %esi
99 ret
100END(swab)
2 * Copyright (c) 1993,94 Winning Strategies, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
--- 15 unchanged lines hidden (view full) ---
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <machine/asm.h>
32__FBSDID("$FreeBSD: head/lib/libc/i386/string/swab.S 184548 2008-11-02 01:28:47Z peter $");
33
34/*
35 * void
36 * swab (const void *src, void *dst, size_t len)
37 * copy len bytes from src to dst, swapping adjacent bytes
38 *
39 * On the i486, this code is negligibly faster than the code generated
40 * by gcc at about half the size. If my i386 databook is correct, it
--- 51 unchanged lines hidden (view full) ---
92 rorw $8,%ax
93 stosw
94 decl %ecx
95 jnz L3
96
97L4: popl %edi
98 popl %esi
99 ret
100END(swab)