8267652: c2 loop unrolling by 8 results in reading memory past array

[VladimirKempik]

Please review this backport to jdk15u-dev
it wasn't applying clean due to the miss of 8223347 in 15u
8223347 is too big to be taken into older JDK, hence I took very small part of 8223347 and included into this backport
This small part moves the location of helper funtions ( like vector_length_in_bytes) in x86.ad
and slighlt changes their signature. it's necessary for predicate(vector_length_in_bytes()) construction to work.
testing - tier1.

---

Progress

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Issue

• JDK-8267652: c2 loop unrolling by 8 results in reading memory past array

Reviewers

• Yuri Nesterenko (@yan-too - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk15u-dev pull/78/head:pull/78
$ git checkout pull/78

Update a local copy of the PR:
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$ git pull https://git.openjdk.java.net/jdk15u-dev pull/78/head

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$ git pr checkout 78

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https://git.openjdk.java.net/jdk15u-dev/pull/78.diff

[bridgekeeper]

👋 Welcome back vkempik! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (d5d49fd1)

[VladimirKempik]

tier1 is fine on fastdebug build as well

[yan-too]

So, OK TTBOOK

[openjdk]

@VladimirKempik This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8267652: c2 loop unrolling by 8 results in reading memory past array

Reviewed-by: yan

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[VladimirKempik]

/integrate

[openjdk]

Going to push as commit ec666c1.

[openjdk]

@VladimirKempik Pushed as commit ec666c1.

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