Cargo Features
b3sum has no features set by default.
[dependencies]
b3sum = { version = "1.5.5", features = ["neon", "prefer_intrinsics", "pure"] }- neon
-
blake3:
The NEON implementation does not participate in dynamic feature detection,
which is currently x86-only. If "neon" is on, NEON support is assumed. Note that AArch64 always supports NEON, but support on ARMv7 varies. The NEON implementation uses C intrinsics and requires a C compiler. - prefer_intrinsics
-
Enables prefer_intrinsics of blake3
blake3:
As described above, on x86_64 this crate use assembly implementations by default. Enabling the "prefer_intrinsics" feature makes this crate use intrinsics implementations on both 32-bit and 64-bit x86, again for testing purposes.
- pure
-
blake3:
By default on x86_64, this crate uses Samuel Neves' hand-written assembly implementations for SSE4.1, AVX2, and AVX512. (These provide both the best runtime performance, and the fastest build times.) And by default on 32-bit x86, this crate uses Rust intrinsics implementations for SSE4.1 and AVX2, and a C intrinsics implementation for AVX-512. In both cases, if a C compiler is not detected, or if AVX-512 support is missing from the detected compiler,
build.rs automatically falls back to a pure Rust build. This feature forces that fallback, for testing purposes. (Note that in CI testing, we set the BLAKE3_CI environment variable, which instructs build.rs to error out rather than doing an automatic fallback.)
b3sum has 3 features without comments.