RFR: 8358105: RISC-V: Optimize interpreter profile updates

[duke]

On Thu, 29 May 2025 11:05:04 GMT, Anjian Wen <wenanjian at openjdk.org> wrote:

> The reason of this patch is same as the x86 and aarch64 but for riscv
> [JDK-8356946](https://bugs.openjdk.org/browse/JDK-8356946)
> [JDK-8357223](https://bugs.openjdk.org/browse/JDK-8357223)
> 
>> First, we carry the implementation for counter decrements without using them. This is dead code, and can be purged. Second, we care about overflows for 64-bit for some reason. I think this is a reminiscent of 32-bit x86 support, where we can plausibly have 32-bit counter overflow in a reasonable timeframe. But for 64-bit counter, we need tens of years of constantly bashing the counter to get it to overflow. No other profile counter update code, e.g. in C1, cares about this.

@Anjian-Wen 
Your change (at version 3dcba0d22bb3747b6ab3590c42a0b07e80a3555b) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/25520#issuecomment-2938044093