[llvm-dev] RFC: Dynamically Allocated "Callee Saved Registers" Lists

[David Chisnall via llvm-dev]

On 9 Jan 2017, at 11:45, Joerg Sonnenberger via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> On Mon, Jan 09, 2017 at 12:47:07PM +0300, Bruce Hoult via llvm-dev wrote:
>> Is there any calling convention, on any supported platform, that requires
>> the callee to preserve a register that was used to pass an argument?
> 
> The "this" parameter for constructors and possible other things is
> handled like that on some platforms. ARM EABI I think?

Do you model that as a callee-save register, or as a register that is both an argument and return register and is guaranteed to return the argument?

David