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[bisected][g33] piglit.spec.ext_framebuffer_object.fbo-cubemap failure

Issue bisected to mesa=bd4e7695

Author: Dylan Baker <dylan@pnwbakers.com>
Date:   Thu Sep 6 15:26:19 2018 -0700

    replace LOG2 with util_fast_log2
    
    The implementation is somewhat different, although if you go back in
    time far enough they're the same, but the one in u_math was changed a
    long time back to be faster.
    
    Reviewed-by: Marek Olšák <marek.olsak@amd.com>
    Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
    Reviewed-by: Matt Turner <mattst88@gmail.com>
    Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3024>

From https://mesa-ci.01.org/mesa_master_daily/builds/5488/results/387199277:

stdout

/tmp/build_root/m64/lib/piglit/bin/fbo-cubemap -auto -fbo
Probe color at (1,34)
  Expected: 0 0 255
  Observed: 255 0 0
Probe color at (1,51)
  Expected: 255 255 0
  Observed: 0 0 255
Probe color at (1,60)
  Expected: 255 255 255
  Observed: 255 255 0
Probe color at (34,34)
  Expected: 255 0 255
  Observed: 0 255 0
Probe color at (34,51)
  Expected: 0 255 255
  Observed: 255 0 255
Probe color at (34,60)
  Expected: 255 0 0
  Observed: 0 255 255
Probe color at (67,34)
  Expected: 255 255 0
  Observed: 0 0 255
Probe color at (67,51)
  Expected: 255 255 255
  Observed: 255 255 0
Probe color at (67,60)
  Expected: 0 255 0
  Observed: 255 255 255
Probe color at (100,34)
  Expected: 0 255 255
  Observed: 255 0 255
Probe color at (100,51)
  Expected: 255 0 0
  Observed: 0 255 255
Probe color at (100,60)
  Expected: 0 0 255
  Observed: 255 0 0
Probe color at (133,34)
  Expected: 255 255 255
  Observed: 255 255 0
Probe color at (133,51)
  Expected: 0 255 0
  Observed: 255 255 255
Probe color at (133,60)
  Expected: 255 0 255
  Observed: 0 255 0
Probe color at (166,34)
  Expected: 255 0 0
  Observed: 0 255 255
Probe color at (166,51)
  Expected: 0 0 255
  Observed: 255 0 0
Probe color at (166,60)
  Expected: 255 255 0
  Observed: 0 0 255

stderr


pid: [7843]
start time: 1587963118.9324563
end time: 1587963119.0275738
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