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[SR-2519] Swift binary can be significantly larger than the source code #45124

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swift-ci opened this issue Aug 30, 2016 · 2 comments
Open

[SR-2519] Swift binary can be significantly larger than the source code #45124

swift-ci opened this issue Aug 30, 2016 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself IRGen LLVM IR generation performance SILGen Area → compiler: The SIL generation stage

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@swift-ci
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Previous ID SR-2519
Radar None
Original Reporter cezarywojcik (JIRA User)
Type Bug

Attachment: Download

Environment

Apple Swift version 3.0 (swiftlang-800.0.43.6 clang-800.0.38)

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, IRGen, Performance, SILGen
Assignee None
Priority Medium

md5: 8783b1f41b2388e7b855c162ac5af4b6

Issue Description:

In my exploration to profile what structure (class, struct, enum) is most efficient as a static function container with regards to both compilation time and binary size, I came upon something that I find quite puzzling.

I generated a ~1M Swift file, however, the compiled binary for this file is ~7.9M (running swiftc class.swift -o class). I attached my generated class.swift file.
@belkadan
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The compile time for a 1MB file isn't very good either, especially with optimizations on.

On my machine, -Onone (the default) produces the 7.9MB binary you refer to; the optimized version is 2.1MB.

@swift-ci
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Comment by Cezary Wojcik (JIRA)

Unoptimized is a lot faster than it was in Swift 2.2 (~30s vs ~125s), but yeah, optimized is still pretty slow (though it has gotten better as well - ~130s in Swift 3 vs ~220s in Swift 2.2).

I got a 2.3MB binary with optimizations on (-O) in Swift 3, though both 2.1 and 2.3 are still 2x larger than the source code itself.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself IRGen LLVM IR generation performance SILGen Area → compiler: The SIL generation stage
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@belkadan @swift-ci