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* sysdeps/i386/i686/memset.S: Fix treatment of unaligned pointer.

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Reported by John Zulauf <john.zulauf@amd.com>.
This commit is contained in:
Roland McGrath 2006-02-22 02:39:11 +00:00
parent 7d93246124
commit 93b94c0412
2 changed files with 12 additions and 7 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2006-02-21 Roland McGrath <roland@redhat.com>
* sysdeps/i386/i686/memset.S: Fix treatment of unaligned pointer.
Reported by John Zulauf <john.zulauf@amd.com>.
2004-11-23 Richard Sandiford <rsandifo@redhat.com>
* configure.in (libc_cv_gcc_dwarf2_unwind_info): Delete.

14
sysdeps/i386/i686/memset.S
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@ -1,6 +1,6 @@
/* memset/bzero -- set memory area to CH/0
Highly optimized version for ix86, x>=6.
Copyright (C) 1999, 2000, 2003, 2005 Free Software Foundation, Inc.
Copyright (C) 1999,2000,2003,2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
@ -64,17 +64,17 @@ ENTRY (BP_SYM (memset))
movl %edx, %edi
cfi_rel_offset (edi, 0)
andl $3, %edx
jz 2f
jnp 3f
stosb
jz 2f /* aligned */
jp 3f /* misaligned at 3, store just one byte below */
stosb /* misaligned at 1 or 2, store two bytes */
decl %ecx
jz 1f
3: stosb
decl %ecx
jz 1f
xorl $3, %edx
jz 2f
stosb
xorl $1, %edx
jnz 2f /* was misaligned at 2 or 3, now aligned */
stosb /* was misaligned at 1, store third byte */
decl %ecx
2: movl %ecx, %edx
shrl $2, %ecx