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

[Emanuel Peter]

On Tue, 27 Jan 2026 08:46:53 GMT, Eric Fang <erfang at openjdk.org> wrote:

>> There used to be a comment, would that one still be accurate?
>
> 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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28313#discussion_r2730945272