Port blake2 on coresimd about hashes HOT 12 OPEN

btw, here's a bounty on this issue: https://www.bountysource.com/issues/59948303-port-blake2-on-coresimd

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How would this work for rustc 1.21..=1.26?

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For v0.8 it will have to be feature-gated behind some feature (it can be the same simd feature), but I am thinking about migrating to Rust 2018 for v0.9.

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What about BLAKE3?

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I’d be very much into us having a high-performance BLAKE3 implementation but am not aware of the state-of-the-art in Rust BLAKE3 libraries /cc @zooko

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See BLAKE3 #103

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I started working on the issue.

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@pczarn it'd be really good to get #228 landed before we try to extend the current implementation

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@tarcieri Okay, so you are close to getting a new implementation, but a migration from core::arch x86/x86_64 intrinsics to a portable core::simd will remain to be done?

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Looks like coresimd is some internal utility, and not core::simd, so:

• could you point me to the code for coresimd?
• would it be better to give it a name that cannot be confused with core's simd?
• are you looking into using core's simd once it gets stabilized?

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I think this ticket is actually referring to core::arch SIMD intrinsics, though adding support for core::simd would be nice

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Ok, please update me when progress with #228 happens

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