Re:How iOS 15 makes apps launch faster
by lanza on Monday July 05, 2021 @07:40PM
(#27742861)
This would only support optimizing for different architectures. Your code is already compiled from Swift -> IR and thus these features would not be part of the IR.
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| on HN ]
Architecture specific («post-compile» time pass) and chained fixups (link time pass) optimisations are orthogonal, and both can take place. Since a) Bitcode IR is, essentially, an object file; b) the destination platform version is known at the post-processing (i.e. download) time, it is possible to also optimise the executable binary format to make us of whatever enhacements are available, too.