Broadcasting sizeof on Ptr returns wrong size

[nielsls]

I'm on Julia v1.4.2 32bit so my pointers are only 4 bytes
Or so I thought... It seems sizeof() has some trouble broadcasting on a parametric Ptr.

julia> sizeof(Ptr)
4

julia> sizeof.((Ptr,))
(8,)

julia> sizeof.((Ptr{Cvoid},))
(4,)

[mbauman]

Also happens on 64-bits:

julia> sizeof(Ptr)
8

julia> sizeof.((Ptr,))
(16,)

Looks like some sort of codegen bug? M-ishWE:

julia> bcargs = ((Ptr,),)
((Ptr,),)

julia> function f(bcargs)
           args = Broadcast._getindex(bcargs, 1)
           return sizeof(args...)
       end
f (generic function with 2 methods)

julia> f(bcargs)
16

julia> args = Broadcast._getindex(bcargs, 1)
(Ptr,)

julia> sizeof(args...)
8

[mbauman]

In short, we're getting the sizeof(UnionAll) instead of sizeof(Ptr).

[Keno]

Looks like a big in the sizeof_tfunc:

julia> f(x) = Core.sizeof(x)
julia> code_typed(f, Tuple{UnionAll})
1-element Vector{Any}:
 CodeInfo(
1 ─     return 16
) => Int64

[Keno]

In a bit of irony, it appears we have this bug in both inference and codegen.