swift: [SR-16027] Compilation speed slowed 200x on Apple Silicon in Swift 5.6
| Previous ID | SR-16027 |
| Radar | rdar://problem/90549915 |
| Original Reporter | @kylebshr |
| Type | Bug |
Attachment: Download
Environment
Xcode 13.3 (13E113) on MacBook Pro with M1 Max
Additional Detail from JIRA
| Votes | 7 |
| Component/s | |
| Labels | Bug |
| Assignee | None |
| Priority | Medium |
md5: 0e1978f4b3feb8996e64b02dd75f5410
Issue Description:
Compiling the attached Accessory.swift file is 200x slower with Swift 5.6 (shipped with Xcode 13.3) vs. Swift 5.5 (shipped with Xcode 13.2.1). I spend a little time trying to get a small code sample, but didn’t want to waste too much more time since it’s not much code. (Twitter thread: https://twitter.com/kylebshr/status/1505752387947941888)
Co-worker with an Intel machine says it’s not (noticeably) slower.
Swift 5.5:
time swiftc Accessory.swift
swiftc Accessory.swift 2.27s user 0.93s system 44% cpu 7.270 total
Swift 5.6
time swiftc Accessory.swift
swiftc Accessory.swift 483.18s user 1.27s system 99% cpu 8:05.03 total
About this issue
- Original URL
- State: open
- Created 2 years ago
- Comments: 17 (1 by maintainers)
I’m no longer seeing the regression in Xcode 13.4 RC that was released today, so must have made it into Swift 5.7 in the past couple weeks
It’s not
The example above still hangs on HEAD @ https://github.com/apple/swift/commit/5bfef4fc4bfa6e424384a39533ceea3744a613cc