7 ms·

Don't trust your compiler. Your code is only fast if you're lucky. https://tiki.li/blog/lucky_code.html https://tiki.li/blog/lucky_code.html

• charleslmunger 2mo ago
  I agree you can't trust your compiler, but you can control its behavior more reliably with __builtin_expect_with_probability https://github.com/protocolbuffers/protobuf/commit/9f29f02a36ae0d2689ca7feebd2d07018436bcde https://github.com/protocolbuffers/protobuf/commit/9f29f02a3...
• foxhill 2mo ago
  that's a nice example. on my M4, i measured 3.4s vs. 0.42s. honestly surprised there's ~10x improvement to be found. as you've pointed out, you've literally micro-optimised this - isn't this what you'd expect? :)
  • ks6g10 2mo ago
    But what is the resulting assembly? I would assume completely different!