[Bug 94091] Tonga unreal elemental segfault since radeonsi: put image, fmask, and sampler descriptors into one array

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=94091

            Bug ID: 94091
           Summary: Tonga unreal elemental segfault since radeonsi: put
                    image, fmask, and sampler descriptors into one array
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 121675
  --> https://bugs.freedesktop.org/attachment.cgi?id=121675&action=edit
gdb bt

R9285 since mesa commit below Unreal ElementalDemo quits at start with a
segfault.

gdb from demo generated core attached

commit 7aedbbacae6d3ec3d06735fff2eb662964773ad2
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Sat Feb 6 22:09:45 2016 +0100

    radeonsi: put image, fmask, and sampler descriptors into one array

    The texture slot is expanded to 16 dwords containing 2 descriptors.
    Those can be:
    - Image and fmask, or
    - Image and sampler state

    By carefully choosing the locations, we can put all three into one slot,
    with the fmask and sampler state being mutually exclusive.

    This improves shaders in 2 ways:
    - 2 user SGPRs are unused, shaders can use them as temporary registers now
    - each pair of descriptors is always on the same cache line

    v2: cosmetic changes: add back v8i32, don't load a sampler state & fmask
        at the same time

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