Code Size Optimization Mode in Swift 4.1

Erik Eckstein:

We have seen that using -Osize reduces code size from 5% to even 30% for some projects.

But what about performance? This completely depends on the project. For most applications the performance hit with -Osize will be negligible, i.e. below 5%. But for performance sensitive code -O might still be the better choice.

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But in contrast to -O, the compiler tries to avoid code duplication. For example, when inlining functions the compiler uses a lower size limit to decide whether a function should be inlined.

Compiler Optimization Programming Swift Programming Language

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