RFR: 8350177: C2 SuperWord: Integer.numberOfLeadingZeros, numberOfTrailingZeros, reverse and bitCount have input types wrongly turncated for byte and short [v7]

[Jasmine Karthikeyan]

On Mon, 30 Jun 2025 05:53:53 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Jasmine Karthikeyan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add case for bytes and prevent vector ops from truncating
>
> src/hotspot/share/opto/superword.cpp line 2612:
> 
>> 2610:   case Op_XorReductionV:
>> 2611:   case Op_MaxReductionV:
>> 2612:   case Op_MinReductionV:
> 
> Can we now remove those, since you are already handling all vectors explicitly above?

I couldn't move it earlier since reduction nodes return a regular type instead of a vector type, but I've pushed a commit that moves it to an `isa_Reduction()` check.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25440#discussion_r2174986411