[Bug 92770] [SNB, regression, dEQP] deqp-gles3.functional.shaders.discard.dynamic_loop_texture

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92770

            Bug ID: 92770
           Summary: [SNB, regression, dEQP]
                    deqp-gles3.functional.shaders.discard.dynamic_loop_tex
                    ture
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (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 dEQP test fails at the following commit:

Author:     Connor Abbott <cwabbott0 at gmail.com>
AuthorDate: Sat Jun 6 13:32:21 2015 -0400
Commit:     Connor Abbott <cwabbott0 at gmail.com>
CommitDate: Fri Oct 30 02:19:00 2015 -0400

    i965: always run the post-RA scheduler

    Before, we would only do scheduling after register allocation if we
    spilled, despite the fact that the pre-RA scheduler was only supposed to
    be for register pressure and set the latencies of every instruction to
    1. This meant that unless we spilled, which we rarely do, then we never
    considered instruction latencies at all, and we usually never bothered
    to try and hide texture fetch latency. Although a later commit removes
    the setting the latency to 1 part, we still want to always run the
    post-RA scheduler since it's able to take the false dependencies that
    the register allocator creates into account, and it can be more
    aggressive than the pre-RA scheduler since it doesn't have to worry
    about register pressure at all.

    Test                   master      post-ra-sched     diff       %diff
    bench_OglPSBump2       396.730     402.386           5.656      +1.400%
    bench_OglPSBump8       244.370     247.591           3.221      +1.300%
    bench_OglPSPhong       241.117     242.002           0.885      +0.300%
    bench_OglPSPom         59.555      59.725            0.170      +0.200%
    bench_OglShMapPcf      86.149      102.346           16.197     +18.800%
    bench_OglVSTangent     388.849     395.489           6.640      +1.700%
    bench_trex             65.471      65.862            0.390      +0.500%
    bench_trexoff          69.562      70.150            0.588      +0.800%
    bench_heaven           25.179      25.254            0.074      +0.200%

    Reviewed-by: Jason Ekstrand <jasoan.ekstrand at intel.com>

Sample test output:

Standard Output

/tmp/build_root/m64/opt/deqp/modules/gles3/deqp-gles3
--deqp-case=dEQP-GLES3.functional.shaders.discard.dynamic_loop_texture
--deqp-surface-type=fbo --deqp-log-images=disable --deqp-surface-width=256
--deqp-surface-height=256
dEQP Core 2014.x (0xcafebabe) starting..
  target implementation = 'DRM'

Test case 'dEQP-GLES3.functional.shaders.discard.dynamic_loop_texture'..
Vertex shader compile time = 5.244000 ms
Fragment shader compile time = 0.635000 ms
Link time = 5.734000 ms
Test case duration in microseconds = 254539 us
  Fail (Fail)

DONE!

Test run totals:
  Passed:        0/1 (0.0%)
  Failed:        1/1 (100.0%)
  Not supported: 0/1 (0.0%)
  Warnings:      0/1 (0.0%)

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