I would expect cif_description to need to be constant (in your example
it's i126, which I don't know where it comes from, but it's definitely
not a constant). Simple promote should do the trick?

On Tue, Dec 30, 2014 at 9:22 PM, Timothy Baldridge <tbaldri...@gmail.com> wrote:
> I'm trying to optimize the FFI functionality in Pixie, and I'm not sure how
> to proceed. From what I understand, the JIT generator is able to optimize
> away calls to jit_libffi and simply replace them with bare calls to the c
> functions. However, not matter how I hint or mark things as immutable, I
> seem to always  have a call to "jit_ffi_call_int". What exactly triggers the
> JIT to remove that call?
>
> The part of the trace involved in the jit call looks like this:
>
> https://gist.github.com/halgari/31b188e8e4757ccb3218
>
> Any ideas?
>
> Thanks,
>
> Timothy
>
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