[PATCH] D119973: RegAllocGreedy: Fix last chance recolor assert in impossible case

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet added a comment.

> Hmm, that's weird, if one register fails within the same level, we should roll back the whole level to its previous state.

Oh I think I see what you mean!
When we successfully recolor part of a level, the recoloring that happened below that level is not rolled back.

Yeah, I could totally see that problem now. I think we've been lucky so far because on failure most levels probably have only register to recolor.


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  https://reviews.llvm.org/D119973/new/

https://reviews.llvm.org/D119973