[Mesa-dev] [Bug 111576] [bisected] Performance regression in X4:Foundations in 19.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111576

            Bug ID: 111576
           Summary: [bisected] Performance regression in X4:Foundations in
                    19.2
           Product: Mesa
           Version: 19.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: malte at zuklampen.com
        QA Contact: mesa-dev at lists.freedesktop.org

Somewhere between mesa-19.1.6 and mesa-19.2.0-rc2 a severe performance
regression in X4:Foundations snuck in.

The main menu (and gameplay) renders at <1 fps after
74470baebbdacc8fd31c9912eb8c00c0cd102903, ac/nir: Lower large indirect
variables to scratch

I tried adjusting graphics settings to perhaps isolate one specific option, but
it didn't seem to matter.

I then checked out mesa-19.2-rc2 and reverted the commit, after which the game
rendered normally at 60fps.

GPU:    AMD RX480
LLVM:   8.0.1
Kernel: 5.2.7

I'll be happy to help diagnose further but I'm at my wits' end.

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