RFR: 8340241: RISC-V: Returns mispredicted [v18]

[Robbin Ehn]

On Thu, 17 Oct 2024 14:06:13 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Updated UEP pretty print with t1
>
> Thanks for the update. Hopefully, I think I can finish first round of review tomorrow. BTW: It will be good to know how this may affect other benchmark workloads, like specjbb2015, etc.

@RealFYang
I programmically looked for t1 uses in Nodes.
The only ones I found missing **cr** (set or kill) was ForwardExceptionjmp and RethrowException.
But compiler don't expect **cr** to survival these i.e. x86 do not kill **cr** in those cases.
Note, maybe some Node(s) was never created, so this is not 100% complete check, but 99%.

@luhenry thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/21406#issuecomment-2425764361