[PATCH] D59444: [GlobalISel] Change MachineIRBuilder's SrcOp to contain subregister info

[Amara Emerson via Phabricator via llvm-commits]

aemerson added a comment.

In D59444#1431750 <https://reviews.llvm.org/D59444#1431750>, @arsenm wrote:

> I would think we would want to avoid any subregister indexes until as late as possible. Does the verifier reject them for G_* instructions?


In practice yes we’d only really use this during selection, but if someone did want to use MachineIRBuilder for emitting copies (as we do in arm64), it should be safe w.r.t CSE as well.


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  https://reviews.llvm.org/D59444/new/

https://reviews.llvm.org/D59444