Temporarily disable arm64 intrinsics in UTF-16 validation code paths #42052
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GrabYourPitchforks
added
area-System.Runtime
tenet-performance
GrabYourPitchforks
requested review from
carlossanlop,
adamsitnik,
pgovind,
tannergooding and
kunalspathak
adamsitnik
approved these changes
Sep 10, 2020
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LGTM, thank you @GrabYourPitchforks !
I've re-run the failed CI legs, as soon as they go green I squash the PR
21 tasks
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/backport to release/5.0-rc2 |
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Started backporting to release/5.0-rc2: https://github.com/dotnet/runtime/actions/runs/247917869 |
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@adamsitnik should someone verify the perf effect of this before back port is merged? |
yes. I would love to do it, but I can't build the runtime repo on Windows ARM64 #42008 ;) |
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Is it possible to cross compile corelib dll and copy it over? I know it's a hassle until we fix the issue you mention. |
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All done thanks @carlossanlop |
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Fixes #41699.
Disables the ARM64-intrinsicified UTF-16 validation code paths since they ended up having poorer performance characteristics for non-ASCII data compared to their 3.x counterparts. With this PR, we skip the intrinsics entirely but stay within vectorized code as much as possible. The codegen and perf should be on-par with what shipped in 3.x.
Once this change is in, we can re-introduce tweaked versions of the arm64 code path, validate the perf numbers, and cherry-pick the "real" fix into the 5.x servicing branches.
/cc @jeffhandley