RFR: 8302113: Improve CRC32 intrinsic with crypto pmull on AArch64

Sat Feb 11 16:29:27 UTC 2023

On Sat, 11 Feb 2023 13:51:02 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Why do we need any new code for this processor? We already have routines for CRC32 using pmull.

Do you refer to [this pmull implementation](https://github.com/openjdk/jdk/blob/1ef9f6507ba45419f0fa896915eec064762c5153/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp#L3753)? It uses pmull to take in 8-bit elements and produces 16-bit results.
The new code uses pmull variation in Cryptographic Extension to take in 32-bit elements and produces 64-bit results. It is more efficient along with eor3.

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PR: https://git.openjdk.org/jdk/pull/12480