On 11/20/2015 05:29 PM, Hans de Goede wrote:
Hi,
On 20-11-15 17:07, Samuel Pitoiset wrote:
On 11/20/2015 11:36 AM, Hans de Goede wrote:
Hi Samual, et al,
Hi Hans,
In
http://cgit.freedesktop.org/mesa/mesa/commit/src/gallium/drivers/nouveau?id=ff72440b40211326eda118232fabd53965410afd
you write: "This compute support has been tested by
Pierre Moreau and myself with some compute kernels."
Can you provide testing instructions (and the
necessary files) so that I can try to reproduce
your tests ?
And once I've reproduced your tests, the next
question is where / how did you get the compute
kernels for testing. I guess you manually wrote them ?
Yeah, I wrote those compute kernels directly in assembly by hand.
I already said few days ago, you have some examples in
src/gallium/tests/trivial/compute.c which show how to use that compute
support stuff with TGSI kernels and without clover.
Ah, right. Ok I'll take a look at those.
Because clover is not currently able to do OpenCL -> TGSI using
Clang/LLVM, you can't really use your backend directly.
I know I'm fine with manually copying TGSI output by llc for my first
tests. I've the feeling I need to understand how inputs to / outputs
from the TGSI code are handled better before I can do further work
on the llvm TGSI backend.
An other way to achieve what you need is to copy/paste your TGSI
kernel in src/gallium/tests/trivial/compute.c, set up the global
buffers and other stuff (maybe samplers, textures and so on) yourself.
This is a bit painful but should work as expected.
As you know I'm working on a llvm tgsi backend,
it actually produces some output now, if you want
to take a peek it lives here:
http://cgit.freedesktop.org/~jwrdegoede/llvm
I'm currently building your TGSI branch. :-)
Cool, note this is very very preliminary. This really
is just curro's work ported to the latest llvm trunk
without me having added anything (yet).
Before working further on this I want to take
a bottom up approach, so I want to first make
sure we've working TGSI -> compute-kernel and
compute-kernel -> hardware steps. So the next
question is, do you know if we can go from
(manually written) TGSI to a compute-kernel
using say nouveau-compiler ?
Sure, you can use nouveau-compiler to convert TGSI to NV50 IR, but as
I said, you can't directly execute your compute kernel without setting
a ton of stuff before... That's a bunch of fun! :-)
Btw, do you still need compute support on your GK208? or did you have
an other card for testing ?
No I've a GT 610 / GF119 card now (still need to plug it in).
Cool, note that compute support is available on tesla, fermi and kepler
since I merged the nv50 compute ~one week ago.
Some bits are missing for tesla and fermi, but I can have look if you
need them. Those bits are mostly related to textures, surfaces and
samplers, but you can already launch "simple" kernels.
Regards,
Hans
--
-Samuel
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