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From: Michael Eager <eager@mvista.com>
To: Richard Sandiford <rsandifo@redhat.com>
Cc: Phil Edwards <phil@jaj.com>, gcc <gcc@gcc.gnu.org>,
	libstdc++@gcc.gnu.org, Paul Koning <pkoning@equallogic.com>
Subject: Re: locking problem with mips atomicity
Date: Thu, 18 Mar 2004 16:18:00 -0000	[thread overview]
Message-ID: <4059CBA5.FD8D4C73@mvista.com> (raw)
In-Reply-To: <877jxito0c.fsf@redhat.com>

Richard Sandiford wrote:
> 
> Michael Eager <eager@mvista.com> writes:
> > I've revised the patch.  It now only has constraints which are referenced.
> > I added a "memory" constraint.
> 
> Sorry if I've missed the explanation, but why is using a memory clobber
> an improvement over an unused memory operand?

The location which is clobbered is unknown.  From what I understand, an
unused memory operand is ignored.  

--
Michael Eager     eager@mvista.com	408-328-8426	
MontaVista Software, Inc. 1237 E. Arques Ave., Sunnyvale, CA  94085

  reply	other threads:[~2004-03-18 16:18 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-15 23:57 Michael Eager
2004-03-16  0:13 ` Phil Edwards
2004-03-16  1:08   ` Michael Eager
2004-03-16  3:12     ` Eric Christopher
2004-03-16  4:57 ` Richard Henderson
2004-03-16 16:10   ` Michael Eager
2004-03-16 17:35     ` Eric Christopher
2004-03-16 17:47       ` Michael Eager
2004-03-16 18:34         ` Richard Henderson
2004-03-16 22:46           ` Michael Eager
2004-03-16 22:49             ` Eric Christopher
2004-03-16 23:27             ` Richard Henderson
2004-03-16 23:33               ` Eric Christopher
2004-03-17  0:28               ` Michael Eager
2004-03-17  0:51                 ` Phil Edwards
2004-03-17  0:55                   ` Michael Eager
2004-03-17  1:19                     ` Phil Edwards
2004-03-17 22:45                       ` Michael Eager
2004-03-18 12:21                         ` Richard Sandiford
2004-03-18 16:18                           ` Michael Eager [this message]
2004-03-18 16:25                           ` Richard Henderson
2004-03-18 16:35                             ` Richard Sandiford
2004-03-17 22:59                       ` Michael Eager
2004-03-18  1:02                         ` Richard Henderson
2004-03-18  7:49                           ` Michael Eager
2004-03-19  8:26                             ` Phil Edwards
2004-03-20  2:56                               ` Michael Eager
2004-03-20  3:39                                 ` Phil Edwards
2004-03-17  1:30                 ` Richard Henderson

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