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@steveklabnik retweeted:

@pcwalton ("Patrick Walton") wrote:

MIR-level value numbering optimizations in rustc seem to work well so far -- WIP branch at https://github.com/pcwalton/rust/tree/value-numbering

This could subsume constant and copy propagation and has the potential to do optimizations that are hard in C++ due to lack of immutability guarantees on memory.