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2016 Oct 20
6
RFC: Killing undef and spreading poison
The fact two IR values are defined the same way doesn't necessarily imply
they are actually the same value.
e.g.
%a = load volatile i32, i32* %p
%b = load volatile i32, i32* %p
As Sanjoy said, though, it should always be legal to optimize all uses of
different "freeze(%x)" values to use the same def - this is equivalent to
choosing the same value for all freezes. It's just not