Function generate_enzyme_call 

pub(crate) fn generate_enzyme_call<'ll, 'tcx>(
    bx: &mut GenericBuilder<'_, 'll, FullCx<'ll, 'tcx>>,
    fn_to_diff: Value<'ll>,
    outer_name: &str,
    ret_ty: Type<'ll>,
    fn_args: &[Value<'ll>],
    attrs: &RustcAutodiff,
    dest_layout: TyAndLayout<'tcx>,
    dest_place: Option<PlaceValue<Value<'ll>>>,
    fnc_tree: FncTree,
) -> IntrinsicResult<'tcx, Value<'ll>>

When differentiating fn_to_diff, take a outer_fn and generate another function with expected naming and calling conventions¹ which will be discovered by the enzyme LLVM pass and its body populated with the differentiated fn_to_diff. outer_fn is then modified to have a call to the generated function and handle the differences between the Rust calling convention and Enzyme.

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1. https://enzyme.mit.edu/getting_started/CallingConvention/ ↩