setindex boundchecked

setindex.jl

julia> function setindex(x::Tuple, v, i::Integer)
           Base.@_inline_meta
           @boundscheck 1 <= i <= length(x) || throw(BoundsError(x, i))
           Base._setindex(v, i, x...)
       end

julia> using BenchmarkTools

julia> const t1 = (42, "", π)
(42, "", π = 3.1415926535897...)

julia> const t2 = (3,)
(3,)

julia> const t3 = Tuple(rand(20))
(0.12092059089915685, 0.03661674260098535, 0.4387447959228026, 0.24924518824102404, 0.8030810236448274, 0.6113071436338902, 0.1478887008495069, 0.05252965682680899, 0.7149387429707006, 0.6413502899926891, 0.019950378256176515, 0.6224574656550699, 0.1629190889632346, 0.5944608345610098, 0.7373917235238237, 0.3132544007992286, 0.8921873321120846, 0.7619310527544245, 0.12834641320033335, 0.8689002074555439)

julia> for tup in (t1, t2, t3)
           for i in eachindex(tup)
               @btime Base.setindex($tup, 3//2, $i)
               @btime setindex($tup, 3//2, $i)
               println("-----------------------")
           end
       end
  139.912 ns (2 allocations: 64 bytes)
  142.343 ns (2 allocations: 64 bytes)
-----------------------
  159.649 ns (2 allocations: 64 bytes)
  151.078 ns (2 allocations: 64 bytes)
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  153.704 ns (2 allocations: 80 bytes)
  161.039 ns (2 allocations: 80 bytes)
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  111.920 ns (2 allocations: 64 bytes)
  111.499 ns (2 allocations: 64 bytes)
-----------------------
  472.692 ns (21 allocations: 512 bytes)
  453.736 ns (21 allocations: 512 bytes)
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  482.299 ns (21 allocations: 512 bytes)
  448.128 ns (21 allocations: 512 bytes)
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  480.917 ns (21 allocations: 512 bytes)
  458.658 ns (21 allocations: 512 bytes)
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  487.662 ns (21 allocations: 512 bytes)
  462.497 ns (21 allocations: 512 bytes)
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  490.397 ns (21 allocations: 512 bytes)
  461.269 ns (21 allocations: 512 bytes)
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  492.378 ns (21 allocations: 512 bytes)
  456.903 ns (21 allocations: 512 bytes)
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  496.508 ns (21 allocations: 512 bytes)
  469.423 ns (21 allocations: 512 bytes)
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  497.560 ns (21 allocations: 512 bytes)
  469.742 ns (21 allocations: 512 bytes)
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  489.479 ns (21 allocations: 512 bytes)
  461.036 ns (21 allocations: 512 bytes)
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  481.549 ns (21 allocations: 512 bytes)
  456.985 ns (21 allocations: 512 bytes)
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  489.877 ns (21 allocations: 512 bytes)
  464.812 ns (21 allocations: 512 bytes)
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  492.149 ns (21 allocations: 512 bytes)
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  497.595 ns (21 allocations: 512 bytes)
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  484.804 ns (21 allocations: 512 bytes)
  464.026 ns (21 allocations: 512 bytes)
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  528.773 ns (21 allocations: 512 bytes)
  485.636 ns (21 allocations: 512 bytes)
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  522.938 ns (21 allocations: 512 bytes)
  499.346 ns (21 allocations: 512 bytes)
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  506.918 ns (21 allocations: 512 bytes)
  482.187 ns (21 allocations: 512 bytes)
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  491.385 ns (21 allocations: 512 bytes)
  473.790 ns (21 allocations: 512 bytes)
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  520.421 ns (21 allocations: 512 bytes)
  499.918 ns (21 allocations: 512 bytes)
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  519.526 ns (21 allocations: 512 bytes)
  481.840 ns (21 allocations: 512 bytes)
-----------------------

setindex2.jl

julia> function f(x::Tuple, v)
           @info "Normal setindex"
           @btime for i in eachindex($x)
               r = Base.setindex($x, $v, i)
               @assert r[end] != 33
           end
           @info "New setindex"
           @btime for i in eachindex($x)
               r = setindex($x, $v, i)
               @assert r[end] != 33
           end
       end

julia> function f2(x::Tuple, v)
           @info "Normal setindex"
           @btime for i in eachindex($x)
               r = Base.setindex($x, $v, i)
               @assert r[end] != 33
           end
           @info "New setindex"
           @btime @inbounds for i in eachindex($x)
               r = setindex($x, $v, i)
               @assert r[end] != 33
           end
       end

julia> f2((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), 22)
[ Info: Normal setindex
  7.466 ns (0 allocations: 0 bytes)
[ Info: New setindex
  8.756 ns (0 allocations: 0 bytes)

julia> f((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), 22)
[ Info: Normal setindex
  7.734 ns (0 allocations: 0 bytes)
[ Info: New setindex
  7.467 ns (0 allocations: 0 bytes)

julia> f((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), 22)
[ Info: Normal setindex
  8.762 ns (0 allocations: 0 bytes)
[ Info: New setindex
  7.467 ns (0 allocations: 0 bytes)

julia> f((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), "ha")
[ Info: Normal setindex
  2.756 ns (0 allocations: 0 bytes)
[ Info: New setindex
  11.598 ns (0 allocations: 0 bytes)

julia> f2((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), "ha")
[ Info: Normal setindex
  2.553 ns (0 allocations: 0 bytes)
[ Info: New setindex
  2.842 ns (0 allocations: 0 bytes)

julia> f((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), π)
[ Info: Normal setindex
  2.216 ns (0 allocations: 0 bytes)
[ Info: New setindex
  2.217 ns (0 allocations: 0 bytes)

julia> f2((3, 4, 7, 9, 8, 7, 5, 4, 1, 3, 4, 3, 55), π)
[ Info: Normal setindex
  2.216 ns (0 allocations: 0 bytes)
[ Info: New setindex
  2.290 ns (0 allocations: 0 bytes)