implement iterate for a >2x speedup

[nsajko]

No description provided.

[nsajko]

using FixedSizeArrays

function f(v)
    z = eltype(v)(false)
    for x ∈ v
        z += x
    end
    z
end

using BenchmarkTools
using Random: rand!

const vec = FixedSizeVector(rand(Int8, 4096))

@btime f(vec) setup=(rand!(vec);)

• on main: 72.995 ns (0 allocations: 0 bytes)
• on PR branch: 30.924 ns (0 allocations: 0 bytes)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.84%. Comparing base (2f729fe) to head (4021b2c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   98.82%   98.84%   +0.01%     
==========================================
  Files           3        3              
  Lines         255      259       +4     
==========================================
+ Hits          252      256       +4     
  Misses          3        3              

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[oscardssmith]

it's kind of dumb that this is necessary. What is the fallback, and can it be improved?

[nsajko]

can it be improved?

Yes, just adding an @inbounds gives the same speedup as here: JuliaLang/julia#57112