[Bug 97779] [BDW GPU hang] stuck on render ring, always reproducible

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97779

--- Comment #12 from regwz <regwz at seznam.cz> ---
I ran a bisect with the following result:

091b6156dd8553979336c15acdaf140e5419c483 is the first bad commit
commit 091b6156dd8553979336c15acdaf140e5419c483
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Tue Dec 8 17:34:38 2015 -0800

    i965/fs: Push small uniform arrays

    Unfortunately, this also means that we need to use a slightly different
    algorithm for assign_constant_locations.  The old algorithm worked based on
    the assumption that each read of a uniform value read exactly one float.
    If it encountered a MOV_INDIRECT, it would immediately bail and push the
    whole thing.  Since we can now read ranges using MOV_INDIRECT, we need to
    be able to push a series of floats without breaking them up.  To do this,
    we use an algorithm similar to the on in split_virtual_grfs.


I also verified that the bug can no longer be reproduced after reverting the
commit from mesa 12.0.3.

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