[LLVMdev] How to represent __attribute__((fastcall)) functions in the IL

[Krzysztof Parzyszek]

On 10/19/2012 10:40 AM, Chandler Carruth wrote:
>
> Don't get me wrong, I don't have any good ideas about how to do this,
> I'm just hoping someone does. End result might allow something like:
>
> declare void @foo(double inreg <eax,edx> %x)
>

Could we have some sort of metadata input for the front-end, where 
"fastcall" would be explicitly defined, together with the required 
targets that implement it?
This way users could provide their own calling convention definitions, 
and use them in a similar fashion to fastcall, i.e. 
__attribute__((my_convention)).

The bitcode could only specify which calling convention is being used, 
and each target lowering would need to translate it properly.

-Krzysztof

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