On Fri, Feb 07, 2014 at 09:51:16AM -0600, Kumar Gala wrote: > > On Feb 7, 2014, at 3:02 AM, Torsten Duwe <d...@lst.de> wrote: > > > On Thu, Feb 06, 2014 at 02:19:52PM -0600, Scott Wood wrote: > >> On Thu, 2014-02-06 at 18:37 +0100, Torsten Duwe wrote: > >>> On Thu, Feb 06, 2014 at 05:38:37PM +0100, Peter Zijlstra wrote: > >> > >>>> Can you pair lwarx with sthcx ? I couldn't immediately find the answer > >>>> in the PowerISA doc. If so I think you can do better by being able to > >>>> atomically load both tickets but only storing the head without affecting > >>>> the tail. > > > > Can I simply write the half word, without a reservation, or will the HW > > caches > > mess up the other half? Will it ruin the cache coherency on some > > (sub)architectures? > > The coherency should be fine, I just can’t remember if you’ll lose the > reservation by doing this.
It should; I suppose; seeing how you 'destroy' the state it got from the load. > >> Plus, sthcx doesn't exist on all PPC chips. > > > > Which ones are lacking it? Do all have at least a simple 16-bit store? > > Everything implements a simple 16-bit store, just not everything implements > the store conditional of 16-bit data. Ok, so then the last version I posted should work on those machines. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
