[Bug 90056] Unigine Valley regression since radeon/llvm: Run LLVM's instruction combining pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90056

            Bug ID: 90056
           Summary: Unigine Valley regression since radeon/llvm: Run
                    LLVM's instruction combining pass
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

R9270X

Since 

commit c6d79ed289a75f13c65f011be870f7e43a0fedc7
Author: Tom Stellard <thomas.stellard at amd.com>
Date:   Fri Apr 10 17:07:16 2015 +0000

    radeon/llvm: Run LLVM's instruction combining pass

    This should improve code quality in general and will help with some
    future changes to how we emit kill instructions.

    shader-db shows a few regressions, but these don't seem to be the result
    of deficiencies in instcombine.  They're mostly caused by the scheduler
    making different decisions than before.

Unigine Valley quits saying -

Unhandled loop condition!
UNREACHABLE executed at SIAnnotateControlFlow.cpp:267!

Only tried my normal settings on valley which are

quality ultra + 8x AA

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