`code_warntype` understanding

New to Julia
, ,
8

model , Psi and x may not be constant

Minimal example reproducing OP’s problem:

julia> struct Model
           x::Float64
       end

julia> (m::Model)(y) = m.x * y

julia> model = Model(3.5) # model is a non-constant global
Model(3.5)

julia> @code_warntype model(2)
Variables
  m::Model
  y::Int64

Body::Float64
1 ─ %1 = Base.getproperty(m, :x)::Float64
│   %2 = (%1 * y)::Float64
└──      return %2

julia> modelcall() = model(2) # using non-constant global "model" within a function definition
modelcall (generic function with 1 method)

julia> @code_warntype modelcall()
Variables
  #self#::Core.Const(modelcall)

Body::Any
1 ─ %1 = Main.model(2)::Any
└──      return %1