[Bug 93840] [i965] Compiler backend uses too much stack with Alien: Isolation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93840

--- Comment #36 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to _archuser_ from comment #34)
> by disabling the shader prewarmer in
> ~/.local/share/feral-interactive/AlienIsolation/preferences
> (EnableShaderWarmer / EnableShaderWarmerPredraw = 0) the game starts and is
> playable (very fast load times, bad hickups as in game shaders are compiled
> on the fly?)
> The prewarmer seems to compile all shaders for the game in one go, maybe
> that is a reason for such a huge running shader program ?

By using those options, the game starts very quickly on SKL too, and there are
no crashes during startup or short gameplay (just more stuttering during actual
gameplay due to on-demand shader compilation).

As it starts fine without dummy version of pthread_attr_setstacksize(),  none
of those mega compute shaders is needed / used during startup or early
gameplay.

I wonder at which place in the game they're actually used...

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