[PATCH] D62392: [DAGCombine][ARM] (sub Carry, X) -> (addcarry (sub 0, X), 0, Carry) fold

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

I mean, we basically need two methods: getAsAddCarry (carry produced by UADDO/ADDCARRY) and getAsSubCarry (carry produced by USUBO/SUBCARRY), depending on how you're planning to use the carry bit, so we don't end up with same sort of mismatch we ran into before on ARM.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D62392/new/

https://reviews.llvm.org/D62392