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Author SHA1 Message Date
Craig Topper b498a23f0e [KnownBits][ValueTracking] Move the math for calculating known bits for add/sub into a static method in KnownBits object 
I want to reuse this code in SimplifyDemandedBits handling of Add/Sub. This will make that easier.

Wonder if we should use it in SelectionDAG's computeKnownBits too.

Differential Revision: https://reviews.llvm.org/D36433

llvm-svn: 310378
 2017-08-08 16:29:35 +00:00