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Use xchgb, bswapl and not rotate/shift.

This commit is contained in:
ad 2007-11-28 17:03:35 +00:00
parent bce4ea0296
commit 0df165c04d
2 changed files with 6 additions and 8 deletions
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6
common/lib/libc/arch/i386/gen/byte_swap_2.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: byte_swap_2.S,v 1.2 2005/12/27 09:38:11 yamt Exp $ */
/* $NetBSD: byte_swap_2.S,v 1.3 2007/11/28 17:03:35 ad Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -36,7 +36,7 @@
#include <machine/asm.h>
#if defined(LIBC_SCCS)
RCSID("$NetBSD: byte_swap_2.S,v 1.2 2005/12/27 09:38:11 yamt Exp $")
RCSID("$NetBSD: byte_swap_2.S,v 1.3 2007/11/28 17:03:35 ad Exp $")
#endif
#if defined(_KERNEL) || defined(_STANDALONE)
@ -48,5 +48,5 @@ _ENTRY(_C_LABEL(ntohs))
_ENTRY(_C_LABEL(htons))
_PROF_PROLOGUE
movzwl 4(%esp),%eax
rorw $8,%ax
xchgb %al, %ah
ret

8
common/lib/libc/arch/i386/gen/byte_swap_4.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: byte_swap_4.S,v 1.2 2005/12/27 09:38:11 yamt Exp $ */
/* $NetBSD: byte_swap_4.S,v 1.3 2007/11/28 17:03:35 ad Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -36,7 +36,7 @@
#include <machine/asm.h>
#if defined(LIBC_SCCS)
RCSID("$NetBSD: byte_swap_4.S,v 1.2 2005/12/27 09:38:11 yamt Exp $")
RCSID("$NetBSD: byte_swap_4.S,v 1.3 2007/11/28 17:03:35 ad Exp $")
#endif
#if defined(_KERNEL) || defined(_STANDALONE)
@ -48,7 +48,5 @@ _ENTRY(_C_LABEL(ntohl))
_ENTRY(_C_LABEL(htonl))
_PROF_PROLOGUE
movl 4(%esp),%eax
rorw $8,%ax
roll $16,%eax
rorw $8,%ax
bswap %eax
ret