8322790: RISC-V: Tune costs for shuffles with no conversion

[Ilyagavrilin]

Hi all, I would like to backport JDK-8322790 to jdk21u in order to improve performance for methods operating with integer representations of floating point values.
Patch applies clean, backported to jdk22u.

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Progress

• JDK-8322790 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8322790: RISC-V: Tune costs for shuffles with no conversion (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u.git pull/434/head:pull/434
$ git checkout pull/434

Update a local copy of the PR:
$ git checkout pull/434
$ git pull https://git.openjdk.org/jdk21u.git pull/434/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 434

View PR using the GUI difftool:
$ git pr show -t 434

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u/pull/434.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back igavrilin! 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.

[openjdk]

⚠️ @Ilyagavrilin This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (83222cd5)

[RealFYang]

@Ilyagavrilin：Shouldn't this be backported into jdk21u-dev repo first? See [1].

[1] https://wiki.openjdk.org/display/JDKUpdates/JDK+21u

[GoeLin]

Hi @Ilyagavrilin

you need to backport this to jdk21u-dev. This repo here is only for ramp down and delivery. Please close this PR.