[Mesa-dev] [Bug 108935] [LLVM Regression] Witcher 3 Corrupted Terrain

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108935

            Bug ID: 108935
           Summary: [LLVM Regression] Witcher 3 Corrupted Terrain
           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: oschowa at web.de
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 142706
  --> https://bugs.freedesktop.org/attachment.cgi?id=142706&action=edit
screenshot

When running The Witcher 3 through DXVK there is terrain corruption in specific
areas. This only occurs when radv is build against LLVM8-svn (r348050).
I tested the following configurations:

- Mesa 18.2.5 + LLVM 7 -> renders correctly
- Mesa-git b186731d5e413c + LLVM7 -> renders correctly
- Mesa-git b186731d5e413c + LLVM8 r348050 -> corrupted

My gpu is an RX580. I'll also attach a screenshot, savegame and renderdoc
capture of the problematic area.

renderdoc capture:
https://drive.google.com/open?id=1Rb2fsZoBLhp6h7RTiCLBJ5mcZwLl_2Ai

savegame: https://drive.google.com/open?id=1hKwP_fOX5rDZM4U24xwWWAnvHQHGHN9b

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