RFR: 8339983: [s390x] secondary_super_cache does not scale well: C1 and interpreter [v2]

[Amit Kumar]

On Wed, 27 Nov 2024 11:03:55 GMT, Andrew Haley <aph at openjdk.org> wrote:

>I'd just move the comparison nearer the conditional branch. 

result_reg could be `noreg`. So it will be popped out and we might loose the content. One such call is at `3245`:

  if (UseSecondarySupersTable) {
    check_klass_subtype_slow_path_table(sub_klass,
                                        super_klass,
                                        temp_reg,
                                        temp2_reg,
                                        /*temp3*/noreg,
                                        /*temp4*/noreg,
                                        /*result*/noreg,
                                        L_success,
                                        L_failure,
                                        set_cond_codes);


But we can store the value in scratch register, maybe `Z_R0` and then move this check.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22341#discussion_r1860467073