SIMD not enabled when iterating over two Arrays with equal sizes

[nalimilan]

At #29458 I noticed that SIMD is not enabled when iterating over two Array objects (e.g. Vector{Int}) with the same size. Here are two examples similar to copyto!:

function f(x, y)
    @assert size(x) == size(y)
    for (i, v) in zip(eachindex(x), y)
        x[i] = v
    end
    x
end

function g(x, y)
    @assert size(x) == size(y)
    for (i, j) in zip(eachindex(x), eachindex(y))
        x[i] = y[j]
    end
    x
end

In the case of g, SIMD is used if adding @inbounds to both indexing operations. In the case of f it doesn't make any difference.

It seems to me that it should be possible to enable SIMD at least when both arguments use 1-based indices.

[KristofferC]

Could you be explicit about the input to the functions to reproduce it? Any Array?

[nalimilan]

Ah, right. I tested this with Vector{Int} (added to the description).