RFR: 8183390: Fix and re-enable post loop vectorization [v4]

[Roland Westrelin]

On Fri, 11 Mar 2022 02:31:08 GMT, Pengfei Li <pli at openjdk.org> wrote:

> > fairly similar. Doesn't/couldn't the logic from issue 5 protect from issue 3?
> 
> True, the SWPointer logic can also protect from issue 3. But I believe keeping loop stride check for issue 3 has no harm and post loop vectorization can bail out earlier with this additional check.

Maybe it's worth mentioning that in a comment next to that code in case someone finds the test too strict and wonder if it can be removed.

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PR: https://git.openjdk.java.net/jdk/pull/6828