On Thu, 2015-03-26 at 22:27 -0400, Ilia Mirkin wrote: > On Thu, Mar 26, 2015 at 10:17 PM, Jan Vesely <jan.ves...@rutgers.edu> wrote: > > On Thu, 2015-03-26 at 21:11 -0400, Rob Clark wrote: > >> On Thu, Mar 26, 2015 at 8:59 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > >> > On Thu, Mar 26, 2015 at 8:50 PM, Rob Clark <robdcl...@gmail.com> wrote: > >> >> On Thu, Mar 26, 2015 at 3:10 PM, Ilia Mirkin <imir...@alum.mit.edu> > >> >> wrote: > >> >>> On Thu, Mar 26, 2015 at 3:02 PM, Jason Ekstrand <ja...@jlekstrand.net> > >> >>> wrote: > >> >>>> On Thu, Mar 26, 2015 at 12:00 PM, Aditya Avinash > >> >>>> <adityaavina...@gmail.com> wrote: > >> >>>>> I mean, implementing fp64 on single precision systems. > >> >>>> > >> >>>> Ok, That makes more sense! Having lowering passes for various FP64 > >> >>>> operations would be great. > >> >>> > >> >>> We should make sure that there are customers of such work. It only > >> >>> makes sense to do this when everything else but FP64 are supported for > >> >>> GL 4.0 (including tess). r600 (eg/ni) is an obvious customer, although > >> >>> that may be easier to do in sb (I believe GlennK has been looking at > >> >>> it, not sure how far he's gotten). Other than that... not sure. Could > >> >>> be that Adreno A420 can do tess && has no native fp64 support, still > >> >>> need to figure that out (hasn't been RE'd yet). > >> >> > >> >> fwiw, fp64 lowering is almost certainly useful for a3xx when we get to > >> >> the point of doing compute.. > >> > > >> > Why does compute need fp64? Do the blob drivers expose the fp64 > >> > capability? > >> > > >> > >> opencl (beyond embedded profile) requires fp64.. blob driver on a3xx > >> only supports embedded profile opencl (roughly everything *except* > >> fp64).. > > > > fp64 is required only for OpenCL 1.2+, embedded also makes int64, and > > atomic functions optional + precision of some built-in operations is > > relaxed. > > I'm reading the OpenCL 2.0 spec... it says > > Double precision is an optional feature so the mandated minimum double > precision floating point capability is 0. > > and also in the bit about changes from OpenCL 1.2: > > Double precision is now an optional core feature instead of an extension > > What makes you say that fp64 is required by CL 1.2+?
I reread the specs, and you are correct, its not required. I don't know why I remembered so. thanks for pointing it out. jan > > -ilia -- Jan Vesely <jan.ves...@rutgers.edu>
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