[Bug 105271] WebGL2 shader crashes i965_dri.so 17.3.3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105271

Mark Janes <mark.a.janes at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at jlekstrand.net,
                   |                            |mark.a.janes at intel.com
           Assignee|intel-3d-bugs at lists.freedes |t_arceri at yahoo.com.au
                   |ktop.org                    |
             Status|NEW                         |ASSIGNED
             Blocks|                            |104757
           Keywords|                            |bisected, regression

--- Comment #1 from Mark Janes <mark.a.janes at intel.com> ---
bisected to:

40e9f2f13847ddd94e1216088aa00456d7b02d2b is the first bad commit
commit 40e9f2f13847ddd94e1216088aa00456d7b02d2b
Author: Timothy Arceri <timothy.arceri at collabora.com>
Date:   Tue Dec 13 11:37:25 2016 +1100
    i965: disable loop unrolling in GLSL IR

    There is a single regression in loop unrolling which is:

    loops HURT:   shaders/orbital_explorer.shader_test GS SIMD8:    0 -> 1

    However the loop is huge so it seems reasonable not to unroll it. It's
    surprising that GLSL IR does unroll it.

    shader-db results BDW:

    total instructions in shared programs: 13037455 -> 13036947 (-0.00%)
    instructions in affected programs: 17982 -> 17474 (-2.83%)
    helped: 63
    HURT: 25

    total cycles in shared programs: 262217870 -> 262227990 (0.00%)
    cycles in affected programs: 2287046 -> 2297166 (0.44%)
    helped: 969
    HURT: 844

    total loops in shared programs: 2951 -> 2952 (0.03%)
    loops in affected programs: 0 -> 1
    helped: 0
    HURT: 1

    LOST:   0
    GAINED: 1

    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=104757
[Bug 104757] [TRACKER] Mesa 18.0 release tracker
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