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[Experiment] revert issue #26494 associated pulls #76986 and #79547#91719

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[Experiment] revert issue #26494 associated pulls #76986 and #79547#91719
shampoofactory wants to merge 0 commit intorust-lang:masterfrom
shampoofactory:master

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@shampoofactory shampoofactory commented Dec 9, 2021

Issue #26494 introduces a P-high auto-vectorization regression as discussed here. This pull reverts those changes with a view to profiling the outcome. As a matter of expediency, I've ignored the 'array-equality.rs' test for now.

If performance degrades we can take this option off the table. Otherwise, failing a timely fix to the underlying issue, a reversion could be discussed with concrete performance data.

If someone could kindly start a perf run.

Thank you.

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perf-regression Performance regression. perf-regression-triaged The performance regression has been triaged. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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