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

Joerg Sonnenberger via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 9 04:31:16 PST 2017

On Mon, Jan 09, 2017 at 11:58:07AM +0000, David Chisnall wrote:
> 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?

I think it is currently modeled as return register with guaranteed


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