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Re:Golang dev.ssa branch merged into tip by witty_username on Wednesday March 02, 2016 @05:30AM (#11209120)
The LLVM docs say that clang uses mem2reg for mutable local variables, so it can't be very slow.

From the end of

http://llvm.org/docs/tutorial/LangImpl7.html#memory-in-llvm

> Proven and well tested: clang uses this technique for local mutable variables. As such, the most common clients of LLVM are using this to handle a bulk of their variables. You can be sure that bugs are found fast and fixed early.

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