[Bug 104271] i965: Timeout in dEQP-GLES31.functional.ssbo.layout.random.all_shared_buffer.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104271

--- Comment #5 from Francisco Jerez <currojerez at riseup.net> ---
IMHO the ultimate reason for the regression is that the dataflow propagation
logic of the copy propagation pass has a serious run-time complexity problem in
acyclic CFGs.  The patch this was bisected to is merely increasing the amount
of work done in each iteration which substantially exacerbates the problem.  A
proper fix would involve reworking the copy propagation dataflow logic to
reduce the polynomial degree of its run-time complexity in the acyclic case. 
Working on it -- It will likely give you better performance than before my
undef handling patch.

Updating importance to high-priority enhancement since this is purely a
(largely pre-existing) compile-time performance issue, spec conformance is
unaffected by it.

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