RFR: 8356159: RISC-V: Add Zabha

Mon May 19 06:49:51 UTC 2025

On Mon, 19 May 2025 06:34:57 GMT, Fei Yang <fyang at openjdk.org> wrote:

> I witnessed performance regressions after this change on two of my OoO machines (around 7%-10% on P550 and SG2042) when doing a quick specjbb2005 test. There are no Zacas or Zabha extensions. This issue disappear if I revert changes in file `src/hotspot/cpu/riscv/assembler_riscv.hpp`. I haven't figured out the reason.

Hmz.. that makes no sense to me :)

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PR Comment: https://git.openjdk.org/jdk/pull/25252#issuecomment-2889811328