[Mesa-dev] [Bug 110811] radv: Assassin's Creed Unity glitches when compiled with recent LLVM 9 (DXVK)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110811

            Bug ID: 110811
           Summary: radv: Assassin's Creed Unity glitches when compiled
                    with recent LLVM 9 (DXVK)
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: asheldon55 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

When Mesa is compiled with a recent version of LLVM 9 (anything newer than
around early May), Assassin's Creed: Unity exhibits graphical glitches when
using RADV and running the game with Wine + DXVK.

The problem does not exist when compiling Mesa against LLVM 8, nor does it
exist when using AMDVLK. Additionally, older Mesa versions such as 19.0.x and
19.1.x exhibit the bug when compiled against LLVM 9.

The problem did not exist with older revisions of LLVM 9. I can run a
regression test if needed, but it could take a while given the size of LLVM.

I've also made a capture with RenderDoc and a Vega 56 GPU, which I've attached
(for the record, the bug also exists with the RX550 card).

Thanks

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