Huge performance hit from exclusive memory access checks

[xwu (Xiaodi Wu)]

Putting an array inside a class is indeed going to pessimize your performance. You may find the following thread and the links there to be helpful:

Low-level swift optimization tips

The past few days i’ve been working on a pure-Swift implementation of lz77 inflate and getting its performance on-par with that of the system-installed libz, so that i can remove the system dependency from Swift PNG. i learned a lot about what works and what doesn’t when it comes to optimizing algorithms implemented in swift, that is specific to the language and that i figured could help other people working on similar frameworks so i wrote up some of my findings for reference. i’m not really a…