[Mesa-dev] [PATCH 2/5] ra: Delete the conflict lists in ra_set_finalize

[Jason Ekstrand]

On Mon, Aug 3, 2015 at 6:12 PM, Eric Anholt <eric at anholt.net> wrote:
> Jason Ekstrand <jason at jlekstrand.net> writes:
>
>> I'm not 100% sure that this is the right patch.  Instead of baking 256 into
>> the allocator, we could allow the user to pass in an initial constant.
>> Since the maximum is statically known, we could also make said constant a
>> hard limit and allocate everything up-front in a single array and save all
>> the allocations.
>
> This sucks if we don't have enormous reg sets.

It does, hence the suggestion that we make the initial size tunable or
just have the user pass in a hard maximum.  Based on my experiments
with i965, either of those would work well.  I'm not sure what this
looks like for vc4.

>  But we don't use the
> conflict_list if you're precomputing the q_values, right?  Maybe flag
> that we don't need conflict lists at all at reg_set creation time?

We can't.  We use the conflict list two places: We use it at the end
for computing q-values and we use it during setup in
add_transitive_conflict.  It's this last use that we can't get away
from as easily as we'd like.
--Jason