RFR: 8371955: Support AVX10 floating point comparison instructions [v8]

[Mohamed Issa]

On Mon, 26 Jan 2026 21:13:10 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

>> Mohamed Issa has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 25 commits:
>> 
>>  - Merge branch 'master' into user/missa-prime/avx10_2
>>  - Merge branch 'master' into user/missa-prime/avx10_2
>>  - Change function names and extend IR encoding rules for CMove tests
>>  - Merge remote-tracking branch 'origin/master' into user/missa-prime/avx10_2
>>  - Remove unnecessary CMOV blocks and adjust predicates involving APX and AVX10.2
>>  - Remove extra jump instruction in signum floating point and unify three-way floating point comparison logic in x86.ad
>>  - Also update copyright year in IREncodingPrinter.java
>>  - Include apx_f in list of verified CPU features for IR encoding
>>  - Fix CMove IR tests to account for APX presence
>>  - Merge branch 'master' into user/missa-prime/avx10_2
>>  - ... and 15 more: https://git.openjdk.org/jdk/compare/44b74e16...09d1e44d
>
> src/hotspot/cpu/x86/x86.ad line 6075:
> 
>> 6073: operand cmpOpUCF() %{
>> 6074:   match(Bool);
>> 6075:   predicate((!UseAPX || !VM_Version::supports_avx10_2()) &&
> 
> Is there a reason why the check is not an and like !UseAPX `&&` !VM_Version::supports_avx10_2() ?

We want to cover the cases where a platform has APX but not AVX10.2 and vice versa.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28337#discussion_r2729386788