[Bug 103632] [i965 bisected] commit 6ee4b352c90e93c82d900328716c1068a7188b91 regress ASTROKILL and EVERSPACE on Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103632

            Bug ID: 103632
           Summary: [i965 bisected] commit
                    6ee4b352c90e93c82d900328716c1068a7188b91 regress
                    ASTROKILL and EVERSPACE on Haswell
           Product: Mesa
           Version: 17.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: d.spitznagel at goodbytez.de
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Hello Intel Mesa team,

ASTROKILL and EVERSPACE (both OpenGL) get a performance hit by 66% on my
Haswell Iris Pro 5200 by this commit...

6ee4b352c90e93c82d900328716c1068a7188b91 is the first bad commit
commit 6ee4b352c90e93c82d900328716c1068a7188b91
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Thu Sep 28 19:03:38 2017 -0700

    i965: Use prog->info.num_images for needs_dc computation

    This should be just as good as looking in prog_data but removes our one
    state setup dependency on brw_stage_prog_data::nr_image_param.

    Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

:040000 040000 30226198325dfb57e721eed2536d5f6a8f8d6068
db3921cc2c5ee969cef70b422f60bb744b5c144d M      src

Checking out to parent commit restores full performance in both games.
Both games use UE4 Engine.
ASTROKILL (Version 0.9.2.1) comes also with a Vulkan build which is broken even
with parent commit.
I will bisect this later.

Both games work with latest stable Mesa 17.2.4 and also the Vulkan build of
ASTROKILL.

I hope you find a fix before Mesa 17.3.0 will be released.

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