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

[David Daney <ddaney@xxxxxxxxxx>]

David Daney wrote:
> Maciej W. Rozycki wrote:
> > On Wed, 19 Sep 2007, Ralf Baechle wrote:
> >
> > > Please make this loop closure branch a branch-likely.  This is necessary
> > > as a errata workaround for some processors.
> >
> >  Do we emulate them for MIPS I?  We do emulate "ll" and "sc" and 
> > adding "sync" is easy
>
> Currently, I (and thus GCC 4.3) am assuming that Linux emulates 'll', 
> 'sc' and 'sync', If sync is not emulated, we would need to adjust the 
> code generation so that it is not emitted on ISAs that don't support it.

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.

David Daney