-O3 does autovectorization: turning your loops into a bunch of SIMD instructions... | Hacker News

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		hun3 9 months ago \| parent \| context \| favorite \| on: Performance of the Python 3.14 tail-call interpret... -O3 does autovectorization: turning your loops into a bunch of SIMD instructions, sometimes even drastically changing performance profile. If autovectorization is "not that much magic" then idk what else it is.

gpderetta 9 months ago | [–]

Any optimization you are familiar with is trivial and expected. Everything else is broken compilers optimizing UB to win benchmarks.

lifthrasiir 9 months ago | [–]

Nowadays it's -O2. I was also surprised when I first learned this.

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