[PATCH] D60460: [SelectionDAG] Let computeKnownBits handle OR-like ADDs better

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D60460#1460375 <https://reviews.llvm.org/D60460#1460375>, @nikic wrote:

> We have an accurate known bits implementation for adds in `KnownBits::computeForAddSub()`, which should handle this and more automatically. We use it to compute add known bits in IR. Is there a reason why it's not used for SDAG known bits?


Hmm, good point. In general because of IR `Value` vs DAG `SDValue`. But clearly that function should work here..


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