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

[Matt Arsenault via Phabricator via llvm-commits]

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I'm beginning to think that mayRecolorAllInterferences has no obligation to skip based on the register class / subregisters, and something else is wrong. The full interference checks are done later. The main failure I'm observing happens when trying to restore the allocation state after last chance recoloring fails. It ends up trying to restore the assignment of a register which is already allocated. I suspect something is going wrong when this is recursively called


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

https://reviews.llvm.org/D119973