[Bug 90901] [regression] dEQP: "Detected variance between two invariant values"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90901

--- Comment #3 from shuo.wang at intel.com ---
I can reproduce this bug by BSW (VGA compatible controller: Intel Corporation
Device 22b1 (rev 21))
Kernel:4.1.0-rc7_kcloud_1845ca_20150612+

Bisect shows: ee5fb8d1ba7f50ed94e1a34fa0f6e15a0588145e is the first bad commit.
commit ee5fb8d1ba7f50ed94e1a34fa0f6e15a0588145e

author    Kristian Høgsberg <krh at bitplanet.net>    2014-10-21 06:29:41 (GMT)
committer    Kristian Høgsberg <krh at bitplanet.net>    2014-12-10 20:29:27 (GMT)
commit    ee5fb8d1ba7f50ed94e1a34fa0f6e15a0588145e (patch)
tree    303ad7ac28769482c37c27fdc448231f9cd9c052
parent    7ff457b93028d1884c7952080edd919008edf141 (diff)
i965: Generate vs code using scalar backend for BDW+
With everything in place, we can now use the scalar backend compiler for
vertex shaders on BDW+.  We make scalar vertex shaders the default on
BDW+ but add a new vec4vs debug option to force the vec4 backend.

No piglit regressions.

Performance impact is minimal, I see a ~1.5 improvement on the T-Rex
GLBenchmark case, but in general it's in the noise.  Some of our
internal synthetic, vs bounded benchmarks show great improvement, 20%-40%
in some cases, but real-world cases are mostly unaffected.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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