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Summary: Convert (uaddo (uaddo x, y), carryIn) into addcarry x, y, carryIn if-and-only-if the carry flags of the first two uaddo are merged via OR or XOR. Work remaining: match ADD, etc. Reviewers: craig.topper, RKSimon, spatel, niravd, jonpa, uweigand, deadalnix, nikic, lebedev.ri, dmgreen, chfast Reviewed By: lebedev.ri Subscribers: chfast, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70079
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