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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression] dEQP: "Detected variance between two invariant values""
href="https://bugs.freedesktop.org/show_bug.cgi?id=90901#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression] dEQP: "Detected variance between two invariant values""
href="https://bugs.freedesktop.org/show_bug.cgi?id=90901">bug 90901</a>
from <span class="vcard"><a class="email" href="mailto:shuo.wang@intel.com" title="shuo.wang@intel.com">shuo.wang@intel.com</a>
</span></b>
<pre>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 <<a href="mailto:krh@bitplanet.net">krh@bitplanet.net</a>> 2014-10-21 06:29:41 (GMT)
committer Kristian Høgsberg <<a href="mailto:krh@bitplanet.net">krh@bitplanet.net</a>> 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 <<a href="mailto:krh@bitplanet.net">krh@bitplanet.net</a>>
Reviewed-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>></pre>
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