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Implements the following SIMD types, as proposed in RustCrypto/traits#444:
U128
(portable)U256
(x86/x86_64 only)U128x8
(portable)These types are largely "storage only" and don't implement arithmetic (if we needed that,
stdsimd
/packed_simd
would be a better choice)The implementation does expose optimized XOR intrinsics, however, which seems to be the main thing useful in a portable cryptographic context, at least as far as our current usages of SIMD go.
The
x86
backend exposes unsafetarget_feature(enable = "...")
functions as part of its API, intended to be used/inlined within SIMD backends for particular algorithms.