Hello! I hope that you are doing well.

I recently found that that rustc by default uses the equivalent to -O3 when compiling for release builds. I find this odd as there is a lot of data on the internet that implies that -O2 sometimes beats -O3 because of less coad bloat, and -O3 can cause weird program behaviour, and possibly other things I can’t really remember right now.

Is there any deeper reason for choosing this flag for release builds?

Thanks!

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