cmd/compile: experiment with more integer comparison optimizations #38721
In Go 1.15 we've added support for integer-in-range optimizations to the SSA backend. This same infrastructure (mostly in https://github.com/golang/go/blob/master/src/cmd/compile/internal/ssa/fuse_comparisons.go) can quite easily be extended to perform other potential control flow transformations. I've opened this issue in order to track them and get more ideas.
Note: these transformations may or may not be worthwhile optimizations.
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