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Re: MIPS atomic memory operations (A.K.A PR 33479).

To: David Daney <ddaney@avtrex.com>
Subject: Re: MIPS atomic memory operations (A.K.A PR 33479).
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Wed, 19 Sep 2007 19:08:40 +0100 (BST)
Cc: Ralf Baechle <ralf@linux-mips.org>, Richard Sandiford <rsandifo@nildram.co.uk>, GCC Mailing List <gcc@gcc.gnu.org>, linux-mips@linux-mips.org
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References: <46F06980.4080500@avtrex.com> <20070919165809.GA14767@linux-mips.org> <Pine.LNX.4.64N.0709191759361.24627@blysk.ds.pg.gda.pl> <46F15BB3.50107@avtrex.com> <46F160BE.9030500@avtrex.com>
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On Wed, 19 Sep 2007, David Daney wrote:

> I just checked myself.  'sync' is not emulated.  We will have to make a change
> so that it is not emitted on ISAs that do not support it.

 The problem is if such software is run on a newer processor it may 
silently break.  Tough, I know...  We should have added "sync" emulation 
long ago.  OTOH, perhaps the MIPS I userbase is not that large anymore for 
the emulation to be required with a short transition period only?

  Maciej

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