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[SR-13299] Repeated.last is 20x slower than Repeated[Repeated.count - 1] #55739

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swift-ci opened this issue Jul 26, 2020 · 0 comments
Open

[SR-13299] Repeated.last is 20x slower than Repeated[Repeated.count - 1] #55739

swift-ci opened this issue Jul 26, 2020 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. performance standard library Area: Standard library umbrella

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Previous ID SR-13299
Radar None
Original Reporter mhdhejazi (JIRA User)
Type Bug

Attachment: Download

Environment

macOS 10.15.6 (19G73)

Xcode 11.6 (11E708)

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 28253a2932c8b4a653b19ea302f51063

Issue Description:

I suppose the cost of accessing the last element from a Repeated collection should be the same whether I used Repeated.last or Repeated[Repeated.count - 1].

But this quick test reveals that Repeated.last is 20x slower than Repeated[Repeated.count - 1] for no obvious reason.
@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. performance standard library Area: Standard library umbrella
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@swift-ci @AnthonyLatsis