RFR: 8361353: [PPC64] C2: Add nodes UMulHiL, CmpUL3, UMinV, UMaxV, NegVI [v2]

[Martin Doerr]

On Fri, 4 Jul 2025 08:14:11 GMT, David Briemann <dbriemann at openjdk.org> wrote:

>> src/hotspot/cpu/ppc/ppc.ad line 2196:
>> 
>>> 2194:     case Op_AbsVF:
>>> 2195:     case Op_AbsVD:
>>> 2196:     case Op_NegVI:
>> 
>> vnegw requires Power9 (`PowerArchitecturePPC64 >= 9`).
>
> Thanks for catching that.

I think we'd need to check that here, too. Otherwise we'd get "bad AD file" errors.
However, there's another problem: vnegw computes the one’s-complement for each element, but we'd need two’s-complement.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26115#discussion_r2184936783