[Bug 96907] piglit.spec.arb_gpu_shader5.arb_gpu_shader5-emitstreamvertex_nodraw intermittent

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96907

            Bug ID: 96907
           Summary: piglit.spec.arb_gpu_shader5.arb_gpu_shader5-emitstream
                    vertex_nodraw intermittent
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

This test fails intermittently with the following signature:

/tmp/build_root/m64/lib/piglit/bin/arb_gpu_shader5-emitstreamvertex_nodraw
-auto -fbo
piglit: debug: Requested an OpenGL 3.2 Core Context, and received a matching
3.3 context

Probe color at (50,50)
  Expected: 0.000000 0.000000 0.000000
  Observed: 1.000000 0.000000 0.000000


Bisected to:
commit df31c1850d14729e27513ae733110a668f6b6e95
Author: Kenneth Graunke <kenneth at whitecape.org>
i965/gs: Use new NIR intrinsics.

By performing the vertex counting in NIR, we're able to elide a
ton of useless safety checks around every EmitVertex() call:

total instructions in shared programs: 3952 -> 3720 (-5.87%)
instructions in affected programs:     3491 -> 3259 (-6.65%)
helped:                                11
HURT:                                  0

Improves performance in Gl32GSCloth by 0.671742% +/-
0.142202% (n=621) on Haswell GT3e at 1024x768.

This should also make it easier to implement Broadwell's "Static
Vertex Count" feature someday.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

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