[PATCH] D103408: DetectDeadLanes: Remove assert for subregister defs

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D103408#2792212 <https://reviews.llvm.org/D103408#2792212>, @efriedma wrote:

> I'm not sure this is the right fix.
>
> From my understanding, REG_SEQUENCE, INSERT_SUBREG, EXTRACT_SUBREG, and PHI should never target a subregister.  For COPY, we can target a subregister, but only if that register is a physical register.

Physical registers do not have subregister indexes. TRI::getSubReg resolves the physreg with index to a different physreg value. It's invalid to combine the two


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https://reviews.llvm.org/D103408