[PATCH] D77795: [GlobalISel] translate freeze to COPY

Thu Apr 9 10:06:05 PDT 2020

arsenm added a comment.

In D77795#1972303 <https://reviews.llvm.org/D77795#1972303>, @gargaroff wrote:

> In D77795#1972248 <https://reviews.llvm.org/D77795#1972248>, @arsenm wrote:
>
> > The copy won't be legalized, so you're going to have issues emitting a copy for any non-legal source. We need a legalizable G_FREEZE
>
>
> How should legalization rules look like? Since the value has to be stable I'm guessing zero extend for widen and unmerge/merge/extract/insert for narrow?

The same as whatever SelectionDAG does? It has the full set of legalize handling

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https://reviews.llvm.org/D77795