4 ms·

Not really, things like branch prediction and JIT optimizations will kick in pretty fast. This is why these benchmarks on jsperf suck - the code gets a differen

by inglor 13y ago

Not really, things like branch prediction and JIT optimizations will kick in pretty fast. This is why these benchmarks on jsperf suck - the code gets a different 'fresh' version every time and jits (like crankshaft in v8 ) don't get to work. Effectively, you're checking 'the performance of interperted JavaScript' most the the time.

goldenkey 13y ago
I bet my bottom dollar that branch prediction is not going to magic away that index dependent if statement in a language like JS, even with Crankshaft in full effect.
- inglor 13y ago
  Here, it's within 20% of the performance. Definitely not n vs 2n http://jsperf.com/oh-look-branches http://jsperf.com/oh-look-branches
  - mraleph 13y ago
    The actual percentage depends on the CPU. On mobile the cost would likely be higher (e.g. on my phone it's around 33%), on old CPU can be even higher, but people don't usually care about them these days.
    - inglor 13y ago
      Hi! Hoped you liked the plugs here. Write more!