RFR: 8288047: Accelerate Poly1305 on x86_64 using AVX512 instructions [v7]

[Volodymyr Paprotski]

On Fri, 4 Nov 2022 17:25:16 GMT, Volodymyr Paprotski <duke at openjdk.org> wrote:

>> src/hotspot/share/opto/library_call.cpp line 7036:
>> 
>>> 7034:   assert(r_start, "r array is NULL");
>>> 7035: 
>>> 7036:   Node* call = make_runtime_call(RC_LEAF,
>> 
>> Can we safely change this to `RC_LEAF | RC_NO_FP`?  For the ChaCha20 block intrinsic I'm working on I've been using that parameter because I'm not touching the FP registers and that looks to be the case here (though your intrinsic is a lot more complicated than mine so I may have missed something).  I believe the GHASH and AES library call routines also call `make_runtime_call()` in this way.
>
> Makes sense to me, will put it in and re-test (no fp registers anywhere in the intrinsic). Thanks!

done

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PR: https://git.openjdk.org/jdk/pull/10582