RFR: 8331126: [s390x] secondary_super_cache does not scale well [v4]

[Amit Kumar]

On Mon, 24 Jun 2024 18:39:02 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Amit Kumar has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Update src/hotspot/cpu/s390/macroAssembler_s390.cpp
>>  - rename: r_scratch to r_result in repne_scan method
>
> src/hotspot/cpu/s390/macroAssembler_s390.cpp line 3173:
> 
>> 3171:   z_cg(r_value, Address(r_addr));
>> 3172:   z_bre(L_exit); // branch on success
>> 3173:   add2reg(r_addr, wordSize);
> 
> Can add2reg change CC? I'd probably rather use z_la for the addition without changing CC.

I just noticed that `PreferLAoverADD` is by default set to false. I'm looking for a reason for that, maybe we can set it to true. Otherwise I'll update it to z_la. 

CC: @RealLucy

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PR Review Comment: https://git.openjdk.org/jdk/pull/19544#discussion_r1651937491