RFR: 8370863: VectorAPI: Optimize the VectorMaskCast chain in specific patterns [v8]

[Eric Fang]

On Tue, 27 Jan 2026 08:55:48 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Yeah, the comment is still there, see line 92 of this file. I refactored this file a bit, now it looks like this:
>> 
>> // comment for testXXXCastToSameType
>> testOneCastToSameType()
>> testTwoCastToSameType()
>> 
>> // comment for testXXXCastToDifferentType
>> testOneCastToDifferentType()
>> testTwoCastToDifferentType()
>
> Honestly, I prefer having comments next to the IR rule.
> If the IR rule fails, you instantly understand the assumptions with the comment.
> The IR rule could fail because: but or additional enhancements.

Make sense, I'll add a comment for each test, thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/28313#discussion_r2730957043