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

Tim Northover via llvm-commits llvm-commits at lists.llvm.org
Mon Jan 30 11:43:57 PST 2017

On 30 Jan 2017, at 11:32, Quentin Colombet <qcolombet at apple.com> wrote:
> I would have expected InstructionSelect to get rid of the unused vregs.

Why? It seems like a pretty arbitrary place to do that. The sensible choices seem to be "leave them be, they're harmless" or "every time a transformation might leave a register unused".



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