https://github.com/apple/swift/pull/8909 これの話かと思ったら違った。

Code Size Reduction: Pass large loadable types by address instead of by value by shajrawi · Pull Request #8909 · apple/swift

radar rdar://problem/28680453 Reduce the size of the text area (code size of the compiled output) by changing the way we generate LLVM IR for loadable types: We do a SIL level transformation, durin...

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https://github.com/apple/swift/pull/9142 こっちか。大きい値型を自動的にアドレス渡しにしてコードサイズを減らそうっていう件。

Code Size: Pass large loadable types by address instead of by value - Updated Version by shajrawi · Pull Request #9142 · apple/swift

radar rdar://problem/28680453 This is an updated version of #8909 It addresses the code review comments and splits the PR into multiple commits Reduce the size of the text area (code size of the co...

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が実装されたんだけど、問題起きて disable されちゃいました。4.0 には入らないと思います。 https://github.com/apple/swift/pull/9452

Disable large types irgen pass by shajrawi · Pull Request #9452 · apple/swift

radar rdar://problem/32064645 Disable large types irgen pass (for now) Swift 4.0 PR #9447