8358179: Performance regression in Math.cbrt

[TobiHartmann]

Hi all,

This pull request contains a backport of commit 38f59f84 from the openjdk/jdk repository.

The commit being backported was authored by Mohamed Issa on 1 Jul 2025 and was reviewed by Sandhya Viswanathan, Srinivas Vamsi Parasa and Emanuel Peter.

Thanks!

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8358179: Performance regression in Math.cbrt (Bug - P3)

Reviewers

• Emanuel Peter (@eme64 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/26085/head:pull/26085
$ git checkout pull/26085

Update a local copy of the PR:
$ git checkout pull/26085
$ git pull https://git.openjdk.org/jdk.git pull/26085/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 26085

View PR using the GUI difftool:
$ git pr show -t 26085

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/26085.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back thartmann! A progress list of the required criteria for merging this PR into jdk25 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8358179: Performance regression in Math.cbrt

Reviewed-by: epeter

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[openjdk]

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

[openjdk]

@TobiHartmann The following label will be automatically applied to this pull request:

• hotspot-compiler

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (c2e2abb7)

[eme64]

LGTM

[TobiHartmann]

Thanks for the review Emanuel!

[TobiHartmann]

/integrate

[openjdk]

Going to push as commit 0a151c6.

[openjdk]

@TobiHartmann Pushed as commit 0a151c6.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.