From: "H. Peter Anvin" <hpa@zytor.com>
To: Jike Song <albcamus@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86: add missed clobber for 32-bit memmove
Date: Fri, 17 Oct 2008 09:35:45 -0700 [thread overview]
Message-ID: <48F8BEE1.1010000@zytor.com> (raw)
In-Reply-To: <1224249353-3032-2-git-send-email-albcamus@gmail.com>
Jike Song wrote:
> memmove() is implemented by inline assembly. It calls std at first
> and cld at last, but EFLAGS still should be clobbered.
gcc always treats EFLAGS as clobbered on x86. The "cc" clobber is
needed on some platforms, but is a noop on x86.
-hpa
next prev parent reply other threads:[~2008-10-17 16:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-17 13:15 [PATCH] x86: add missed clobber for 32-bit memmove Jike Song
2008-10-17 13:15 ` Jike Song
2008-10-17 15:55 ` Jeremy Fitzhardinge
2008-10-17 16:35 ` H. Peter Anvin [this message]
2008-10-20 6:44 ` Jike Song
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