4 ms·

They can't guess, which is why they all offer `__builtin_expect` to control them (which people often wrap in LIKELY/UNLIKELY macros).

• astrange 7y ago
  Yes, but we need the opposite. There's no way to say a branch has no expected value.
  • dooglius 7y ago
    Clang does have __builtin_unpredictable, but last I checked it doesn't actually seem to have an effect.