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

Quentin Colombet via llvm-commits llvm-commits at lists.llvm.org
Mon Jan 30 11:52:07 PST 2017

> 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.

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