RFR: 8332587: RISC-V: secondary_super_cache does not scale well [v3]

[Andrew Haley]

On Fri, 7 Jun 2024 09:45:29 GMT, Gui Cao <gcao at openjdk.org> wrote:

> There are a bit regression in cases of testNegative63/64, although these might be rare cases or not very common cases, but it's worth to have a try to improve it if possible. I guess it's related to the implementation for the cases when bitmap is full. When it's full, before go to `repne_scan`, there're some instructions to execute. I wonder if it will help to have another "bitmap full test" just after "bitmap false test" (which is `test_bit(t0, r_bitmap, bit);`). But I'm not sure if it's feasible, maybe worth a try.

So many superinterfaces is very rate. So rare, in fact, that it may never have happened in production Java code.

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PR Comment: https://git.openjdk.org/jdk/pull/19320#issuecomment-2168073615