Is Julia using -O3? I would find that surprising as it is not recommended. -O3 could be a good starting point, but with maturity a frontend should be evaluating

Is Julia using -O3? I would find that surprising as it is not recommended. -O3 could be a good starting point, but with maturity a frontend should be evaluating individual passes. "One of the most common mistakes made by new language frontend projects is to use the existing -O2 or -O3 pass pipelines as is. These pass pipelines make a good starting point for an optimizing compiler for any language, but they have been carefully tuned for C and C++, not your target language. You will almost certainly need to use a custom pass order to achieve optimal performance." https://www.llvm.org/docs/Frontend/PerformanceTips.html https://www.llvm.org/docs/Frontend/PerformanceTips.html