[Mesa-dev] [Bug 111039] [radv] - Persona 5 in RPCS3 emulator has glitches when using hardware fp16 (LLVM 9)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111039

            Bug ID: 111039
           Summary: [radv] - Persona 5 in RPCS3 emulator has glitches when
                    using hardware fp16 (LLVM 9)
           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

Since RPCS3 added support for native 16-bit float support, Persona 5 is
exhibiting graphical glitches when using its Vulkan renderer:

With hardware fp16:
https://i.imgur.com/NOyfaN7.jpg

With hardware fp16 disabled (correct rendering):
https://i.imgur.com/7oYKdBi.jpg

System:
Gentoo AMD64
Mesa git (RADV)
LLVM 9 git
RPCS3 git
Vega 56

Here's a link to the corresponding RPCS3 report:
https://github.com/RPCS3/rpcs3/issues/6150

They suggest the problem may be with LLVM code generation. I should note that
AMDVLK also has the same bug, which supports this conclusion. LLVM 8 can't be
tested since it causes a black screen with RPCS3
(https://bugs.freedesktop.org/show_bug.cgi?id=110970).

Also of note, bug doesn't occur with an RX-550 (on RADV or AMDVLK) and the bug
doesn't occur at all on Windows. So it looks to be a Vega specific bug, and
only on Linux.

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