[jdk11u-dev] RFR: 8250902: Implement MD5 Intrinsics on x86 [v2]

[Paul Hohensee]

On Mon, 7 Feb 2022 12:50:45 GMT, Paul Hohensee <phh at openjdk.org> wrote:

>> I'd like to backport MD5 intrinsification because it improves security related performance. I understand that it may be a bridge too far for 11u. In that case we (Amazon) intend to backport it to our internal 11u distro followed by Corretto.
>> 
>> Testing: tier1, including the new and existing sha tests.
>> 
>> Ludovic Henry did an 11u backport in 2020 (see [JDK-8251319](https://bugs.openjdk.java.net/browse/JDK-8251319)), but I can't find a review request on the jdk-updates-dev list. My backport is essentially identical to his, and is based on the [backport from jdk15u](https://github.com/openjdk/jdk15u-dev/pull/163). It was not clean.
>> 
>> 1. Copyright date conflicts.
>> 2. Context differences.
>> 3. Changing SHAOptionsBase to DigestOptionsBase.
>> 4. Rewriting Assembler::roll() to use emit_int8() because emit_int16() and emit_24() don't exist in 11.
>> 
>> This backport would be immediately followed by a backport of [JDK-8251260](https://bugs.openjdk.java.net/browse/JDK-8251260) to fix two tests. After that, I'd like to backport the aarch64 version in [JDK-8251216](https://bugs.openjdk.java.net/browse/JDK-8251216).
>
> Paul Hohensee has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - 8250902: Implement MD5 Intrinsics on x86
>  - Merge branch 'master' into backport-339016a0
>  - 8250902: Implement MD5 Intrinsics on x86
>  - Backport 339016a0f2cbbbbc3560e50c6726e14afbf547f6

Backport rejected.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/806