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>3. Go is not a good candidate for this universal runtime in 2016 due its lack of a mature optimization pipeline. Maybe in a few years, but in the meantime you'

• pcwalton 10y ago
  Given how long it took LLVM to become competitive with GCC (and LLVM has been SSA from the start), even with a world-class team of optimization experts behind it, I think history has shown that it takes a long time to compete with mature optimizing compiler pipelines. There's no substitute for the long engineering slog of tuning a generational GC and implementing algebraic simplifications, alias analysis, devirtualization, SROA, SCCP, instruction selection, instruction scheduling, autovectorization, LICM at multiple IR-levels, etc. No silver bullet substitute for the hard engineering work exists (other than using an off-the-shelf backend, of course). Microbenchmarks are one thing; breadth and depth are another. It doesn't take much to compete with GCC in a loop summing integers (unless GCC vectorizes that loop or precomputes the value, of course!) but competing on SPECINT is quite another.