Amaury Sechet 8ac81f3924 Do not legalize large add with addc/adde, introduce addcarry and do it with uaddo/addcarry ...

Summary: As per discution on how to get better codegen an large int legalization, it became clear that using a glue for the carry was preventing several desirable optimizations. Passing the carry down as a value allow for more flexibility.

Reviewers: jyknight, nemanjai, mkuper, spatel, RKSimon, zvi, bkramer

Subscribers: igorb, llvm-commits

Differential Revision: https://reviews.llvm.org/D29872

llvm-svn: 301775

2017-04-30 19:24:09 +00:00

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