On the swift-dev list they announced the 2.2 branch is now under
restrictive change control. If you're been putting off checking it out, I'd
suggest the next snapshot is worth a look.
I did some benchmarks on the last snapshot using a Parks-McClellan filter
design algorithm. The algorithm is heavy on floating point arithmetic with
a little trig while iterating over arrays.
Swift 2.2: 2.10ms
Swift 2.1: 2.70ms
Go 1.5.2: 2.93ms
Ruby 2.0.0: 85.50ms
Math performance is important to my plans for Swift, so this makes me
happy. Ruby and Go haven't improved on this benchmark in two years.
The Parks-McClellan filter design algorithm is hosted here:
Unfortunately, compile times are longer in 2.2. But one day we'll have it