Efficiently creating and updating a struct of SVectors

[Tetrakai]

I see the same as you on my laptop (Intel i5-6300u running julia 1.10.4 with default optimization), but on pc (AMD 2990wx running julia 1.11.0-rc1 with -O3 flag) all three of those are ~ equally fast.

I saw this same thing earlier here:

SVectors + @reset from Accessors: Strange Benchmarks

If we get rid of the random number, can’t the compiler just calculate the result? I think that is what I am seeing when I make it simpler. Results differ on my PC vs laptop (which are also different Julia versions…) and depending on the optimization flag.

Slimmed MWE

using Parameters, StaticArrays, Accessors, BenchmarkTools using Distributions, Random @with_kw struct Str00{N} fat :: SVector{N, Float64} sh_c0 :: SVector{N, Float64} sh_cm :: SVector{N, Float64} end Random.seed!(…