[Bug 92234] [BDW] GPU hang in Shogun2

[bugzilla-daemon at freedesktop.org]

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

Matt Turner <mattst88 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|idr at freedesktop.org         |mattst88 at gmail.com
                 CC|mattst88 at gmail.com          |
             Status|NEEDINFO                    |REOPENED

--- Comment #14 from Matt Turner <mattst88 at gmail.com> ---
I believe I came across a bug that is the cause of these problems.

I sent a four patch series

      i965/fs: Rename opt_copy_propagate -> opt_copy_propagation.
      i965/fs: Add unit tests for copy propagation pass.
      i965/fs: Reject copy propagation into SEL if not min/max.
      nir: Move fsat outside of fmin/fmax if second arg is 0 to 1.

where the 3rd is the bug fix.

My theory is that enabling NIR caused the code we optimize in the backend to
hit this bug.

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