Nikita Popov
766062255a
[LVI] Get value range from mask comparison ...
InstCombine likes to canonicalize comparisons of the form
X == C || X == C+1 into (X & -2) == C'. Make sure LVI can still
recover the value range from this. Can of course also be useful
for proper mask comparisons.
For the sake of clarity, the implementation goes through KnownBits
to compute the range.
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