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Re: An ia32 LOCK/XADD bug.

To: Ulrich Drepper <drepper at cygnus dot com>
Subject: Re: An ia32 LOCK/XADD bug.
From: amodra at one dot net dot au
Date: Thu, 17 May 2001 17:49:10 +0930
Cc: "H . J . Lu" <hjl at lucon dot org>, GNU C Library <libc-alpha at sourceware dot cygnus dot com>, binutils at sourceware dot cygnus dot com
References: <20010516125536.A6006@lucon.org> <20010517001556.B16213@lucon.org> <20010517172055.A14368@squeak.one.net.au> <m3y9rwl8bg.fsf@otr.mynet>

On Thu, May 17, 2001 at 12:54:11AM -0700, Ulrich Drepper wrote:
> amodra@one.net.au writes:
> 
> > > 1. How to write a correct exchange_and_add? Is exchange_and_add_1 ok?
> > 
> > I think you'll need to use "=&r" and "=&m" as output constraints.
> 
> No, why?  Without the & the instruction is explained exactly right.

You're correct.  Muddy thinking on my part.

References:
- An ia32 LOCK/XADD bug.
  - From: H . J . Lu
- Re: An ia32 LOCK/XADD bug.
  - From: amodra
- Re: An ia32 LOCK/XADD bug.
  - From: Ulrich Drepper

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