[Mesa-dev] [RFC PATCH 0/6] r600: speed up tesselation shaders

[Gert Wollny]

Am Freitag, den 08.12.2017, 16:30 +1000 schrieb Dave Airlie:
> [snip]
> 
> So I haven't commited these yet, because I wanted to see if I could
> get sb to work.
Well, it was very much work in progress, I didn't expect it to be
committed as is anyway. 

> 
> https://cgit.freedesktop.org/~airlied/mesa/log/?h=r600-sb-lds-wip
> 
> is my non functional attempt, so far, biut it gpu hangs on the nop
> shader.

I've played aound it a bit and added some hacks to make it not hang,
i.e. sb scheduls calls into any slot, but LDS read/write should go only
into SLOT_X, and not splitting up the fetch seemed to be important
(patch attached). 


However, gcm moves around the LSD_OQ* loads changing the order without
changing the order of the according LDS_READ_RET calls. At least for
this the nop shader still fails. 

I tried to persuade the optimizer to not reorder these move
instructions by adding a "use" to the dst-value of a node that reads
from a LDS_OQ to the next node that reads from the same queue, but to
no avail. I guess I didn't figure out how to count these extra uses
properly when the instructuions are scheduled.

Best, 
Gert 
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