8371820: Further AES performance improvements for key schedule generation

[TheRealMDoerr]

This fix simplifies the hotspot intrinsics for some platforms and optimizes the key computation for encryption. We can save the genInvRoundKeys computation when we only do encryption.

The micro:org.openjdk.bench.javax.crypto.AESReinit benchmark results are improved by 17% for ppc64 and 26% for x86_64.

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Issue

• JDK-8371820: Further AES performance improvements for key schedule generation (Enhancement - P4)

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[TheRealMDoerr]

@smemery: I've seen your recent improvements and performance measurements. It would be great if you could take a look at this proposal and check the performance results in your environment.

[bridgekeeper]

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[openjdk]

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[openjdk]

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[mlbridge]

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• 00: Full (477a3dda)