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    What may be the most interesting part of this post is the fact that the author modified GCC to run with only a simple register allocator and combiner. Using these two backend passes it was able to achieve between 70 and 80 percent the performance of GCC at -O2, which runs many more passes.

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      Note this is over a year old. Ruby 3.0 contains the JIT but I don’t believe it can run Rails yet.