RFR: 8371955: Support AVX10 floating point comparison instructions [v3]

[Mohamed Issa]

On Fri, 9 Jan 2026 00:26:17 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Mohamed Issa has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Also update copyright year in IREncodingPrinter.java
>
> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 1056:
> 
>> 1054:     }
>> 1055:     jcc(Assembler::equal, DONE_LABEL);    // handle special case +0.0/-0.0, if argument is +0.0/-0.0, return argument
>> 1056:     jcc(Assembler::parity, DONE_LABEL);   // handle special case NaN, if argument NaN, return NaN
> 
> It looks to me that these two could be replaced by one jcc.
> For with AVX 10.2:
>   jcc if Sign flag is set to DONE_LABEL
> For without AVX 10.2:
>   jcc if equal to DONE_LABEL

Yes, that would work. The code becomes a little more cryptic, but it should be fine with enough explanation in the comments.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/28337#discussion_r2674435533