RFR: 8351994: Enable Extended EVEX to REX2/REX demotion when src and dst are the same [v17]

[Srinivas Vamsi Parasa]

On Fri, 2 May 2025 23:30:25 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   more clarifying comments next to boolean literals
>
> src/hotspot/cpu/x86/assembler_x86.cpp line 4403:
> 
>> 4401:   emit_arith(0x0B, 0xC0, dst, src);
>> 4402: }
>> 4403: 
> 
> No need to add this function now.

Please see orw() removed in the updated code.

> src/hotspot/cpu/x86/assembler_x86.cpp line 12979:
> 
>> 12977:   }
>> 12978:   emit_operand(src1, src2, 0);
>> 12979: }
> 
> This function could be removed, not used.

Please see the unused function removed in the updated code.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24431#discussion_r2073688221
PR Review Comment: https://git.openjdk.org/jdk/pull/24431#discussion_r2073687771