[Bug 94681] dEQP-GLES31.functional.ssbo.layout.random.all_shared_buffer.23 takes 25 minutes to compile

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94681

--- Comment #2 from Matt Turner <mattst88 at gmail.com> ---
Okay, the problem is that there are a ton of untyped_surface_writes, which
"have side effects" and are therefore treated as barrier dependencies.
add_barrier_dep() walks over the whole list of instructions in the basic block
(of which there are about 10 thousand).

It seems a bit absurd to add a dependency on instructions on the other side of
another barrier...

Maybe we could go ahead and schedule pending instructions when we see a barrier
instead of doing all of this work?

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