I got it. Thanks for your tips!

> 2 окт. 2016 г., в 0:13, Jens Persson <j...@bitcycle.com> написал(а):
> 
> You could write some examples in both C and Swift in order to gain experience 
> in how to write your Swift code so that it will (probably) run as fast as (or 
> faster than) your corresponding C code.
> 
> I've done this for a number of different performance critical things and it 
> is often possible to get the Swift version as fast as the C version.
> 
> (If you find something that is not possible (or unnecessarily cumbersome) to 
> write as fast in Swift as in C, you could probably file a bug/improvement on 
> bugs.swift.org. I did this some time ago when I noticed that Swift's 
> optimizer missed an opportunity to unroll loops in a certain situation and it 
> turned out that a fix/optimizer-improvement was already on its way.)
> 
> You must of course profile/microbenchmark your code in some meaningful way, 
> setting all relevant compiler flags for both C and Swift, preventing dead 
> code elimination, measuring average or perhaps median times of lots of tests, 
> making sure what should and shouldn't be statically knowable, etc.
> 
> In Swift you probably want -O -whole-module-optimization, and (rarely) you 
> might want/need to disable safety checks.
> 
> /Jens
> 
> 
> 
>> On Sat, Oct 1, 2016 at 10:33 PM, Daniel Dunbar via swift-users 
>> <swift-users@swift.org> wrote:
>> Yes, it is possible. Exactly how much use of Unsafe style idioms and other 
>> performance-focused "workarounds" it requires depends a lot on the code in 
>> question. Can you say more about your problem area?
>> 
>>  - Daniel
>> 
>> > On Oct 1, 2016, at 1:30 PM, Игорь Никитин via swift-users 
>> > <swift-users@swift.org> wrote:
>> >
>> > Hello!
>> > Is it possible for Swift to be as fast as C when writing performance 
>> > critical code? Of course if using C Standard Library for instead of 
>> > Foundation (and so on) and getting rid of dynamic dispatch and reference 
>> > types.
>> > Or I need just to use C?
>> > _______________________________________________
>> > swift-users mailing list
>> > swift-users@swift.org
>> > https://lists.swift.org/mailman/listinfo/swift-users
>> 
>> _______________________________________________
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