[Bug 104271] i965: Timeout in dEQP-GLES31.functional.ssbo.layout.random.all_shared_buffer.5
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Dec 15 21:23:07 UTC 2017
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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