On Fri, Mar 08, 2019 at 03:56:02PM -0600, Josh Poimboeuf wrote: > On Fri, Mar 08, 2019 at 10:33:43PM +0100, Peter Zijlstra wrote: > > On Fri, Mar 08, 2019 at 03:16:03PM -0600, Josh Poimboeuf wrote:
> > > Can you elaborate on why (in the patch description)? Did this actually > > > find any occurrences? > > > > Nope, didn't find anything. Also, all DF users are in asm so I didn't > > really expect any. Having it escape would probably result in fairly > > instant wreckage though. > > > > DF=1 results in things like rep mov going _backwards_. > > Ok, I wonder if we really need to add this then. Well, Linus asked for it, and it was a fairly trivial add-on :-)
