[Mesa-dev] [Bug 109075] radv: New D3D boolean optimizations cause GPU hang in Witcher 3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109075

            Bug ID: 109075
           Summary: radv: New D3D boolean optimizations cause GPU hang in
                    Witcher 3
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: philip.rebohle at tu-dortmund.de
        QA Contact: mesa-dev at lists.freedesktop.org

Hello,

the following commit introduces a GPU hang in Witcher 3 on RADV:

commit 6bcd2af0863aea9d9d3519300a75820d012e1160
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Fri Oct 19 16:58:36 2018 -0500

    nir/algebraic: Add some optimizations for D3D-style Booleans


Specifically, the following optimization seems to be the culprit, as commenting
it out fixes it:

   (('iand', ('ineg', ('b2i', a)), '1.0 at 32'), ('b2f', a)),


A Renderdoc capture to reproduce the hang can be found here (recorded with
Renderdoc 1.2 on Polaris):
https://mega.nz/#!5CgAgAzZ!k9ZmQDVIiqXynhoJ0xEZmrRJpDr-7yYYc8CtMGnKjfo

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