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chacha20: Add full NEON backend. #310

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merged 4 commits into from
Dec 1, 2022
Merged

chacha20: Add full NEON backend. #310

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3014c69
chacha20: Add full NEON backend.
codahale Oct 30, 2022
35492bb
chacha20: Gate NEON backend behind `neon` feature.
codahale Oct 30, 2022
5cb2100
chacha20: Re-enable CI for NEON backend
codahale Oct 30, 2022
b748d1e
chacha20: Update README to include `neon`
codahale Oct 30, 2022
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6 changes: 3 additions & 3 deletions .github/workflows/chacha20.yml
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Expand Up @@ -197,9 +197,9 @@ jobs:
rust: stable

# ARM64 with NEON backend
#- target: aarch64-unknown-linux-gnu
# rust: nightly
# features: --features neon
- target: aarch64-unknown-linux-gnu
rust: stable
features: --features neon

# PPC32
- target: powerpc-unknown-linux-gnu
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1 change: 1 addition & 0 deletions chacha20/Cargo.toml
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Expand Up @@ -32,6 +32,7 @@ hex-literal = "0.3.3"
[features]
std = ["cipher/std"]
zeroize = ["cipher/zeroize"]
neon = []
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It might be worth considering using a cfg! attribute here /cc @newpavlov

I think the only reason to have a gated implementation at all is MSRV compatibility. We can bump to MSRV 1.61 in the next release (bumping to 1.60 has some nice additions like weak feature activation).

Semi-related issue: RustCrypto/sponges#24 (comment)

FWIW, we use cfg! attributes to gate aes and pmull intrinsics on ARMv8


[package.metadata.docs.rs]
all-features = true
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6 changes: 4 additions & 2 deletions chacha20/README.md
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Expand Up @@ -34,6 +34,8 @@ work on stable Rust with the following `RUSTFLAGS`:
- `x86` / `x86_64`
- `avx2`: (~1.4cpb) `-Ctarget-cpu=haswell -Ctarget-feature=+avx2`
- `sse2`: (~2.5cpb) `-Ctarget-feature=+sse2` (on by default on x86 CPUs)
- `aarch64`
- `neon` (~2-3x faster than `soft`) requires Rust 1.61+ and the `neon` feature enabled
- Portable
- `soft`: (~5 cpb on x86/x86_64)

Expand Down Expand Up @@ -76,8 +78,8 @@ done with a minor version bump.

Licensed under either of:

* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](http://opensource.org/licenses/MIT)
- [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
- [MIT license](http://opensource.org/licenses/MIT)

at your option.

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2 changes: 2 additions & 0 deletions chacha20/src/backends.rs
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Expand Up @@ -15,6 +15,8 @@ cfg_if! {
pub(crate) mod sse2;
}
}
} else if #[cfg(all(feature = "neon", target_arch = "aarch64", target_feature = "neon"))] {
pub(crate) mod neon;
} else {
pub(crate) mod soft;
}
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