On Thu, Aug 21, 2014 at 7:36 PM, Dave Airlie <airl...@gmail.com> wrote:
> On 21 August 2014 19:10, Henri Verbeet <hverb...@gmail.com> wrote: > > On 21 August 2014 04:56, Michel Dänzer <mic...@daenzer.net> wrote: > >> On 21.08.2014 04:29, Henri Verbeet wrote: > >>> For whatever it's worth, I have been avoiding radeonsi in part because > >>> of the LLVM dependency. Some of the other issues already mentioned > >>> aside, I also think it makes it just painful to do bisects over > >>> moderate/longer periods of time. > >> > >> More painful, sure, but not too bad IME. In particular, if you know the > >> regression is in Mesa, you can always use a stable release of LLVM for > >> the bisect. You only need to change the --with-llvm-prefix= parameter to > >> Mesa's configure for that. Of course, it could still be mildly painful > >> if you need to go so far back that the current stable LLVM release > >> wasn't supported yet. But how often does that happen? Very rarely for > me. > >> > > Sure, it's not impossible, but is that really the kind of process you > > want users to go through when bisecting a regression? Perhaps throw in > > building 32-bit versions of both Mesa and LLVM on 64-bit as well if > > they want to run 32-bit applications. > > > >> Without LLVM, I'm not sure there would be a driver you could avoid. :) > >> > > R600g didn't really exist either, and that one seems to have worked > > out fine. I think in a large part because of work done by Jerome and > > Dave in the early days, but regardless. From what I've seen from SI, I > > don't think radeonsi needed to be a separate driver to start with, and > > while its ISA is certainly different from R600-Cayman, it doesn't > > particularly strike me as much harder to work with. > > > > Back to the more immediate topic though, I think think that on > > occasion the discussion is framed as "Is there any reason using LLVM > > IR wouldn't work?", while it would perhaps be more appropriate to > > think of as "Would using LLVM IR provide enough advantages to justify > > adding a LLVM dependency to core Mesa?". > > Could we use an llvm compatible IR? is also a question I'd like to see > answered. > What do you mean by llvm compatible? Do you mean forking their IR inside mesa or just something that's easy to translate back and forth? --Jason Ekstrand
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