[llvm-dev] ABI for i256 in MCJIT

[Lang Hames via llvm-dev]

Hi Pawel,

This should be fine. MCJIT doesn't use any special calling conventions. As
long as your JIT'd code has the same calling convention as the callback in
the host program this *should* just work. If it doesn't please file a bug
and assign it to me. :)

- Lang.

On Thu, Apr 14, 2016 at 4:59 AM, Paweł Bylica <llvm-dev at lists.llvm.org>
wrote:

> Hi,
>
> I have a small JIT project based on MCJIT. The generated LLVM IR code uses
> the i256 type. Also, the jitted code has to call back the host application
> from time to time. E.g. it calls a function i256 @callback(i256).
>
>    1. Can the callback function be implemented on the host application
>    side (C/C++) to match the ABI used for the call by MCJIT? Or maybe the i256
>    has be to be casted to any struct type on LLVM side to make that possible?
>    2. Should that work correctly on different host OSes?
>
> So far I used pointer arguments for both arguments and return types. But
> I'm afraid that using pointers blocks a lots of optimizations.
>
> - Paweł
>
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