What should happen here?

[IGotD-]

On Wednesday, 22 September 2021 at 18:30:41 UTC, Ali Çehreli 
wrote:
>
> Shouldn't preserving the contents of registers be the 
> responsibility of the compiler or the GC? And perhaps the 
> compiler should skip that optimization if the contents cannot 
> be preserved?
>
> Ali

Not according to most ABIs. Parameters are usually not preserved 
on stack. Should it be forced on stack because of FFI? I 
personally don't think so.

I think you are attacking this problem from the wrong side. It is 
not a problem of the optimizer or code generation. It's not the 
problem of the ABI. It's a life time issue regardless of the type 
of GC you use. If a resource is moved (both temporary and 
permanent) to any foreign system, you must have a way of 
describing that.