[llvm-dev] RFC: Adding Register Calling Convention Support

[Philip Reames via llvm-dev]

Seems technically straight forward form the LLVM perspective. The only 
complication is it looks like your callee saved register lists are 
influenced by the number of arguments to the functions. I'm not sure 
that'll be easy to encode with the current infrastructure.

Philip


On 09/22/2016 12:07 AM, Ben Simhon, Oren via llvm-dev wrote:
>
> Hi All,
>
> The Register Calling Convention (RegCall) was introduced by Intel to 
> optimize parameter transfer on function call.
>
> This calling convention ensures that as many values as possible are 
> passed or returned in registers.
>
> To use RegCall, place the keyword before a function declaration. For 
> example:
>
> /__regcall int foo (int i, int j); // Windows OS/
>
> /__attribute__((regcall)) foo (int I, int j); // Linux OS and Mac OS X)/
>
> The calling convention is described in more details here:
>
> /_https://software.intel.com/en-us/node/693069_/
>
> We are adding support for RegCall calling convention for Clang and 
> LLVM IR.
>
> The first step will include the implementation for LLVM IR.
>
> I will appreciate your comments.
>
> Thanks,
>
> Oren
>
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