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by UniQP 3762 days ago
As stated in [1] they use a variant of "Simple and Efficient Construction of Static Single Assignment Form" [2], which does not require a dominator tree (or a liveness analysis).

[1] https://github.com/golang/go/blob/master/src/cmd/compile/int...

[2] http://pp.info.uni-karlsruhe.de/uploads/publikationen/braun1...