Fiona Glaser b0a2d8c5a5 ComputeKnownBits: be a bit smarter about ADDs ...

If our two inputs have known top-zero bit counts M and N, we trivially
know that the output cannot have any bits set in the top (min(M, N)-1)
bits, since nothing could carry past that point.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241927 91177308-0d34-0410-b5e6-96231b3b80d8

2015-07-10 18:29:02 +00:00

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