[Bug 51787] New: performance regression with llvm shader compiler in ut2004

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51787

             Bug #: 51787
           Summary: performance regression with llvm shader compiler in
                    ut2004
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: aaalmosss@gmail.com


Whenever some new geometry appears (even for weapon projectiles), the framerate
drops drastically for a short time. This is a frequent event, so the game
becomes unplayable overall.

There is also a big preformance drop with the old compiler, when several
players get gibbed at once (happens frequently on as-convoy), but with the llvm
compiler this is much worse.

I'm not an expert on this, but it seems as if a new vertex shader would be
compiled for each vertex array submitted, and the llvm compiler is an order of
magnitude slower.

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