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I'm working Rust implementations of hash-based signature schemes. For them it would be great to have parallel (x2, x4, x8) versions of
f1600
.This simple PR adds such parallel versions using
packed_simd
.On my old Haswell I see
So
f1600x4
takes 161ns for a singlef1600
, which makes it 2.6x faster than fourf1600
s.Some notes
packed_simd
is still only available for nightly, so I've put these vectorized functions behind a feature gate.f1600xn
functions are created by a macro. We could instead create a trait for all operations we use onu64xn
(and evenu64
) and makef1600x2
, ...f1600x8
andf1600
instances of a_f1600<T>
.