RFR: 8320500: [vectorapi] RISC-V: Optimize vector math operations with SLEEF [v4]

[Robbin Ehn]

On Tue, 24 Sep 2024 03:50:29 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   refine comment
>
> src/hotspot/cpu/riscv/riscv.ad line 10078:
> 
>> 10076:   match(CallLeafVector);
>> 10077: 
>> 10078:   effect(USE meth);
> 
> It's possible for the runtime call to clobber rFlagsReg `cr` (aka `t1`). So safer to add `KILL cr` to the effect.

Good find, it will definitely be clobbered.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21083#discussion_r1772674338