RFR: 8349686: [s390x] C1: Improve Class.isInstance intrinsic [v8]

[Amit Kumar]

On Thu, 20 Feb 2025 09:43:24 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   remove frame requirement
>
> src/hotspot/cpu/s390/macroAssembler_s390.cpp line 3674:
> 
>> 3672:                                                    Register r_temp2,
>> 3673:                                                    Register r_temp3) {
>> 3674:   assert_different_registers(r_sub_klass, r_super_klass, r_result, r_temp1, r_temp2, r_temp3, Z_R0_scratch);
> 
> Suggestion:
> 
>   assert_different_registers(r_sub_klass, r_super_klass, r_result, r_temp1, r_temp2, r_temp3);

But we are still using Z_R0, to resize the frame, at line 3708 and 3718.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23535#discussion_r1963327400