[Bug 100785] [regression, bisected] arb_gpu_shader5 piglit fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100785

            Bug ID: 100785
           Summary: [regression, bisected] arb_gpu_shader5 piglit fail
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: Hi-Angel at yandex.ru
        QA Contact: dri-devel at lists.freedesktop.org

Failing tests:

        bin/arb_gpu_shader5-interpolateAtSample -auto -fbo
        bin/arb_gpu_shader5-interpolateAtSample-nonconst -auto -fbo

Bisection result:


eb8aa93c03ee89ffd3041d41b6293e4b282b6ce6 is the first bad commit
commit eb8aa93c03ee89ffd3041d41b6293e4b282b6ce6
Author: Timothy Arceri <tarceri at itsqueeze.com>
Date:   Fri Apr 14 16:25:58 2017 +1000

    glsl: disable varying packing for varying used by interpolateAt*

    Currently the NIR backends depend on GLSL IR copy propagation to
    fix up the interpolateAt* function params after varying packing
    changes the shader input to a global. It's possible copy propagation
    might not always do what we need it too, and we also shouldn't
    depend on optimisations to do this type of thing for us.

    I'm not sure if the same is true for TGSI, but the following
    commit should re-enable packing for most cases in a safer way,
    so we just disable it everywhere.

    No change in shader-db for i965 (BDW)

    Acked-by: Elie Tournier <elie.tournier at collabora.com>
    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

Reverting the commit fixes the problem.

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