8296602: RISC-V: improve performance of copy_memory stub

[VladimirKempik]

Clean backport to jdk19u
test results to follow

---

Progress

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

Issue

• JDK-8296602: RISC-V: improve performance of copy_memory stub

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk19u pull/77/head:pull/77
$ git checkout pull/77

Update a local copy of the PR:
$ git checkout pull/77
$ git pull https://git.openjdk.org/jdk19u pull/77/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 77

View PR using the GUI difftool:
$ git pr show -t 77

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk19u/pull/77.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.

[openjdk]

@VladimirKempik 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:

8296602: RISC-V: improve performance of copy_memory stub

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

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[mlbridge]

Webrevs

• 00: Full (97900a18)

[VladimirKempik]

/integrate

[openjdk]

Going to push as commit 7e340b3.
Since your change was applied there have been 17 commits pushed to the master branch:

• 677a7c4: 8297241: Update sun/java2d/DirectX/OnScreenRenderingResizeTest/OnScreenRenderingResizeTest.java
• a370758: 8296945: PublicMethodsTest is slow due to dependency verification with debug builds
• 6615c05: 8296957: One more cast in SAFE_SIZE_NEW_ARRAY2
• 793c16c: 8022403: sun/java2d/DirectX/OnScreenRenderingResizeTest/OnScreenRenderingResizeTest.java fails
• d1268e9: 8294538: missing is_unloading() check in SharedRuntime::fixup_callers_callsite()
• 6c7378a: 8290964: C2 compilation fails with assert "non-reduction loop contains reduction nodes"
• 3f3bbdf: 8285835: SIGSEGV in PhaseIdealLoop::build_loop_late_post_work
• 4708c7b: 8287217: C2: PhaseCCP: remove not visited nodes, prevent type inconsistency
• 71b38e2: 8292780: misc tests failed "assert(false) failed: graph should be schedulable"
• 62db7bb: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop
• ... and 7 more: https://git.openjdk.org/jdk19u/compare/d3d724991ce0bc46201f562910530a18f58e766b...master

Your commit was automatically rebased without conflicts.

[openjdk]

@VladimirKempik Pushed as commit 7e340b3.

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