[llvm] r293537 - GlobalISel: permit unused vregs without a register-class after ISel.

[Quentin Colombet via llvm-commits]

> On Jan 30, 2017, at 11:50 AM, Tim Northover <tnorthover at apple.com> wrote:
> 
> On 30 Jan 2017, at 11:48, Quentin Colombet <qcolombet at apple.com> wrote:
>> My problem is not with unused register, it is with unused register without register class.
>> After ISel everything should have a register class otherwise that means that the instruction hasn’t been selected.
> 
> Has a non-existent instruction been selected, or not? Who can say.

I am confused, if it is here, it is not non-existent. Down the road my problem is that this instruction may hit MC and the compiler will not know how to handle it, right?

> 
> Tim.