[Bug 92234] [BDW] GPU hang in Shogun2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92234

--- Comment #10 from Ian Romanick <idr at freedesktop.org> ---
There's a lot of information in this bug, and I want to make sure I understand
it all.

Pavel Ondračka can reproduce the hang in Total War: Shogun2 on Mesa
11.0.something (from commit c0722be9).

Pavel Popov can reproduce the hang in Total War: Napoleon and Total War: Empire
on Mesa 11.0.4 (from commit ec14e6f8).

Pavel Popov can reproduce the hang in TW:N and TW:E on Mesa 10.6 (unknown
commit).

Pavel Popov cannot reproduce the hang in TW:N or TW:E on Mesa 10.4 (unknown
commit).

Ken cannot reproduce the hang in TW:E on Mesa 10.2 (commit 604ae33).

Ken cannot reproduce the hang in TW:E on Mesa master (unknown commit from
3-December-2015).

Pavel Popov cannot reproduce the hang in TW:N or TW:E on Mesa master (from
commit 41e82f4f).

Reverting some patches (604ae33c8 or f5cf74d8, but *not both*) that add
algebraic optimizations or disabling nir_opt_algebraic.py eliminates the hangs.

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