Integrated: 8316186: RISC-V: Remove PlatformCmpxchg<4>

[Robbin Ehn]

On Wed, 13 Sep 2023 12:25:41 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi, please consider.
> 
> I don't know the history behind the Cmpxhg<4>, but it is not needed anymore.
> Using compiler as in 8 byte case is just fine.
> 
> Passes hotspot-tier (qemu, vf2 still running), some manual extra testing via gtest, looked at compiler: output, e.g. https://godbolt.org/z/a31Gdqn8q
> 
> If you know the history please share, and if you have a reason why we should keep it please speak up!

This pull request has now been integrated.

Changeset: b8fa6c23
Author:    Robbin Ehn <rehn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b8fa6c23f5f7c4991ee6f0881a0452e591b65217
Stats:     35 lines in 1 file changed: 0 ins; 33 del; 2 mod

8316186: RISC-V: Remove PlatformCmpxchg<4>

Reviewed-by: fyang, mli

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PR: https://git.openjdk.org/jdk/pull/15715