llvm dev - Sep 2020 - Relation between Register and MCRegister

Hello,

I'm trying to understand what the relation between these two types is: do
we need them both? Register seems to be delegating to MCRegister without
owning any new additional responsibilities.

Thanks!
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Hi,

Register can represent virtual or physical registers.
MCRegister can only represent physical registers.

Eventually all Register instances are replaced by a MCRegister. 

Cheers,
-Quentin
> On Sep 28, 2020, at 5:46 PM, Mircea Trofin via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hello,
> 
> I'm trying to understand what the relation between these two types is:
do we need them both? Register seems to be delegating to MCRegister without
owning any new additional responsibilities.
> 
> Thanks!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

On Tue, Sep 29, 2020 at 9:08 AM Quentin Colombet <qcolombet at apple.com>
wrote:
> Hi,
>
> Register can represent virtual or physical registers.
> MCRegister can only represent physical registers.
>
That's what I thought, but MCRegister has some stack slot APIs.

> Eventually all Register instances are replaced by a MCRegister.
>
What happens in that case to the stack slot APIs?

>
> Cheers,
> -Quentin
>
> > On Sep 28, 2020, at 5:46 PM, Mircea Trofin via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hello,
> >
> > I'm trying to understand what the relation between these two types
is:
> do we need them both? Register seems to be delegating to MCRegister without
> owning any new additional responsibilities.
> >
> > Thanks!
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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