RFR: 8350459: MontgomeryIntegerPolynomialP256 multiply intrinsic with AVX2 on x86_64 [v4]

[Sandhya Viswanathan]

On Wed, 5 Mar 2025 23:03:23 GMT, Volodymyr Paprotski <vpaprotski at openjdk.org> wrote:

>> Add AVX2 montgomery multiplication intrinsic. (About 60-80% gain)
>> 
>> Also add reduction to existing AVX512 multiplication (this was left-over from https://github.com/openjdk/jdk/pull/19893 where a quick fix was required). This is mostly for cleanup, but there is about 1-2% gain.
>> 
>> Before (no AVX512)
>> 
>> Benchmark                        (algorithm)  (dataSize)  (keyLength)  (provider)   Mode  Cnt      Score     Error  Units
>> SignatureBench.ECDSA.sign    SHA256withECDSA        1024          256              thrpt   40   3720.589 ±  17.879  ops/s
>> SignatureBench.ECDSA.sign    SHA256withECDSA       16384          256              thrpt   40   3605.940 ±  15.807  ops/s
>> SignatureBench.ECDSA.verify  SHA256withECDSA        1024          256              thrpt   40   1076.502 ±   4.190  ops/s
>> SignatureBench.ECDSA.verify  SHA256withECDSA       16384          256              thrpt   40   1069.624 ±   2.484  ops/s
>> Benchmark                             (algorithm)  (keyLength)  (kpgAlgorithm)  (provider)   Mode  Cnt     Score   Error  Units
>> KeyAgreementBench.EC.generateSecret          ECDH          256              EC              thrpt   40   830.448 ± 2.285  ops/s
>> 
>> After (with AVX2)
>> 
>> Benchmark                        (algorithm)  (dataSize)  (keyLength)  (provider)   Mode  Cnt      Score     Error  Units
>> SignatureBench.ECDSA.sign    SHA256withECDSA        1024          256              thrpt   40   6000.496 ±  39.923  ops/s
>> SignatureBench.ECDSA.sign    SHA256withECDSA       16384          256              thrpt   40   5739.878 ±  34.838  ops/s
>> SignatureBench.ECDSA.verify  SHA256withECDSA        1024          256              thrpt   40   1942.437 ±  12.179  ops/s
>> SignatureBench.ECDSA.verify  SHA256withECDSA       16384          256              thrpt   40   1921.770 ±   8.992  ops/s
>> Benchmark                             (algorithm)  (keyLength)  (kpgAlgorithm)  (provider)   Mode  Cnt     Score   Error  Units
>> KeyAgreementBench.EC.generateSecret          ECDH          256              EC              thrpt   40  1399.761 ± 6.238  ops/s
>> 
>> 
>> Before (with AVX512):
>> 
>> Benchmark                        (algorithm)  (dataSize)  (keyLength)  (provider)   Mode  Cnt       Score     Error  Units
>> SignatureBench.ECDSA.sign    SHA256withECDSA        1024          256              thrpt   40    9621.950 ±  27.260  ops/s
>> SignatureBench.ECDSA.sign    SHA256withECDSA       16384          256              thrpt   40    8975.654 ±  26.707  o...
>
> Volodymyr Paprotski has updated the pull request incrementally with one additional commit since the last revision:
> 
>   more comment improvements

Looks good to me.

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Marked as reviewed by sviswanathan (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23719#pullrequestreview-2662829592