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

[Dave Airlie]

On 11 December 2017 at 22:49, Gert Wollny <gw.fossdev at gmail.com> wrote:
> 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.

I thought I'd done this already, I must dig a bit more.

I've pushed mosre stuff to the branch, nop still doesn't work.

I've included your patche in one of the squashes, I think we should be
pretty close.

Dave.