8279292: riscv: Intrinsify multiplyToLen and squareToLen

[feilongjiang]

BigInteger intrinsic: MultiplyToLen and SquareToLen intrinsic are missed in current vm. They should be implemented.
The JMH tests show that the MultiplyToLen intrinsic improve the performance by up to 2x ~ 3x and the SquareToLen intrinsic improve the performance by up to 1.8x ~ 2x when the length of BigInteger changed from 1 to 5000, compared with that of C2.

Full jtreg tests on qemu and hotspot/jdk tier1 test on Unmathced are passed without new failures.

JMH tests and results on D1 and Unmatched list as follows:
MyBenchmark.txt

squareToLen_unmatched.txt
squareToLen_d1.txt
multiplyToLen_unmatched.txt
multiplyToLen_d1.txt

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8279292: riscv: Intrinsify multiplyToLen and squareToLen

Reviewers

• Fei Yang (@RealFYang - Reviewer)

Contributors

• Taiping Guo <guotaiping1@huawei.com>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/riscv-port pull/38/head:pull/38
$ git checkout pull/38

Update a local copy of the PR:
$ git checkout pull/38
$ git pull https://git.openjdk.java.net/riscv-port pull/38/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 38

View PR using the GUI difftool:
$ git pr show -t 38

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/riscv-port/pull/38.diff

[bridgekeeper]

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

[feilongjiang]

/contributor add Taiping Guo guotaiping1@huawei.com

[mlbridge]

Webrevs

• 05: Full - Incremental (aca73fbe)
• 04: Full - Incremental (ae5180aa)
• 03: Full - Incremental (d5d6a5a1)
• 02: Full - Incremental (1d6c0cb3)
• 01: Full - Incremental (872b0b96)
• 00: Full (5d745571)

[openjdk]

@feilongjiang
Contributor Taiping Guo <guotaiping1@huawei.com> successfully added.

[feilongjiang]

@RealFYang Thank you for the review. I have addressed all your comments above. :-)

[RealFYang]

Looks good.

[openjdk]

@feilongjiang 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:

8279292: riscv: Intrinsify multiplyToLen and squareToLen

Co-authored-by: Taiping Guo <guotaiping1@huawei.com>
Reviewed-by: fyang

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

At the time when this comment was updated there had been no new commits pushed to the riscv-port branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

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[feilongjiang]

/integrate

[RealFYang]

/sponsor

[openjdk]

@feilongjiang
Your change (at version aca73fb) is now ready to be sponsored by a Committer.

[openjdk]

Going to push as commit b396cdd.

[openjdk]

@RealFYang @feilongjiang Pushed as commit b396cdd.

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