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

[Lutz Schmidt]

On Tue, 25 Jun 2024 03:26:24 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

>> 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

Use LA explicitly here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19544#discussion_r1652832511