Integrated: 8329726: Use non-short forward jumps in lightweight locking

[Roman Kennke]

On Fri, 5 Apr 2024 13:33:33 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> This turns a few short-jumps to long-jumps in x86 lightweight locking code paths. When running with -XX:+ShowMessageBoxOnError, MA::stop() generates more code and jccb is not sufficient to address this.
> 
> Two of the jccb are in ASSERT path anyway. However, another is also in a product path. We *could* generate jccb or jcc conditionally on ShowMessageBoxOnError, however, I don't think it is worth the trouble. WDYT?
> 
> Unfortunately, I could not make a simple test-case, because ShowMessageBoxOnError stops and waits on error, which would make jtreg time-out.
> 
> Testing:
>  - [x] manual test with dacapo as provided in the bug report
>  - [ ] tier1

This pull request has now been integrated.

Changeset: 2e925f26
Author:    Roman Kennke <rkennke at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/2e925f263d5a9a69f21e0c12bd71242fdff084cd
Stats:     45 lines in 2 files changed: 41 ins; 0 del; 4 mod

8329726: Use non-short forward jumps in lightweight locking

Reviewed-by: shade, kvn, aboldtch

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PR: https://git.openjdk.org/jdk/pull/18657