[SR-10437] Compile time is long when expression adds a negative #52837
Labels
bug
A deviation from expected or documented behavior. Also: expected but undesirable behavior.
compiler
The Swift compiler in itself
performance
type checker
Area → compiler: Semantic analysis
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Attachment: Download
Environment
Swift 5.0, Xcode 10.2.
To find the source of long compile times, I enabled the following flags under "Other Swift Flags" in Build Settings:
-Xfrontend -warn-long-function-bodies=100-Xfrontend -warn-long-expression-type-checking=100Additional Detail from JIRA
md5: a88c4a9789ebea9517c32777b15bf095
Issue Description:
I have found a bug that increases compile times a great deal.
I saw long compile times when I used the negative operator in front
of a variable and added that variable. When I removed the negative
operator, and just subtracted the variable instead, compile times
returned to normal. The two screenshots show what happens.
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