4 ms·

For example: https://godbolt.org/z/m3xSse https://godbolt.org/z/m3xSse

• huhtenberg 7y ago
  How is basic loop unrolling is "not even close" to the expected result when you explicitly ask for optimization with O3?
  • umanwizard 7y ago
    This isn’t basic loop unrolling; it’s replacing an entire loop with a closed form mathematical formula.
    • huhtenberg 7y ago
      It's a form of loop unrolling. Regardless of the term, this is still very much in the ballpark of what you'd expect when asking for optimization.