[llvm-dev] GVN pass: does global value numbering remove duplicate computations in loops?

[Daniel Berlin via llvm-dev]

>
>
> If I recall correctly, AWZ will get this too (
> https://courses.cs.washington.edu/courses/cse501/04wi/papers/alpern-popl88.pdf).
> AWZ is a Hopcroft-partitioning-based algorithm, and Hopcroft partitioning
> is O(n*log(n)).
>
> Yes, AWZ will get some, and the hash based ones will get some different
ones.

The one i have implemented unifies AWZ and hash based and will also do
predication/value inference.
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