[PATCH] D156345: RegisterCoalescer: Add implicit-def of super register when coalescing SUBREG_TO_REG

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

ping, I don't really see a better option without ripping out SUBREG_TO_REG right now. We'd have to have some kind of way to go backwards from the defining instruction to an opcode that does define the whole register (which could have been done in tablegen during selection to begin with)


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  https://reviews.llvm.org/D156345/new/

https://reviews.llvm.org/D156345