[jdk21u-dev] RFR: 8358534: Bailout in Conv2B::Ideal when type of cmp input is not supported

[Aleksey Shipilev]

On Thu, 19 Jun 2025 11:34:42 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean bailout from the optimization added in JDK 21. While the patch is fairly recent, it does not come with elevated risk, as it just skips the optimization in the case where the alternative is compiler crash. This crash is seen in real world: https://github.com/adoptium/adoptium-support/issues/1191
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `all`

Ah, OK, I see the comment now. So the answer is simple: the fix went into 21u on June 23, this is way past the stabilization cutoff for 21.0.8 (July 2025) release. The fix would normally be in 21.0.9 (Oct 2025). In retrospect, we could have requested a critical approval for July 2025 release, but there is not a solid chance it would have been accepted.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1904#issuecomment-3079686860