From: Kevin Ryde <user42@zip.com.au>
Cc: guile-user@gnu.org
Subject: Re: Fetch-and-store for PowerPC... and more!
Date: Fri, 18 Mar 2005 07:48:12 +1100 [thread overview]
Message-ID: <87wts6f183.fsf@zip.com.au> (raw)
In-Reply-To: <87k6o6ad5j.fsf@laas.fr> (Ludovic Courtès's message of "Thu, 17 Mar 2005 09:29:28 +0100")
ludovic.courtes@laas.fr (Ludovic Courtès) writes:
>
> I don't think so since `mem', as an address, isn't changed.
Yep, I meant the contents.
> `memory' denotes the reservation bit I guess).
No, memory normally means any crazy fetch or store, so gcc won't defer
storing stuff and wont hold stuff in registers across your asm.
"*mem" is the only actual change, so expressing that only it is
fetched/stored should give better code. Though the actual current
usages are simple enough that it probably doesn't make any difference.
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next prev parent reply other threads:[~2005-03-17 20:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-16 8:48 Fetch-and-store for PowerPC... and more! Ludovic Courtès
2005-03-16 23:26 ` Kevin Ryde
2005-03-17 8:29 ` Ludovic Courtès
2005-03-17 20:48 ` Kevin Ryde [this message]
2005-03-18 9:26 ` Marius Vollmer
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