CheckPresenceOfTypeIdentifierAttribute - avoid requesting syntax trees if we know that we already decoded all well-known attributes. #24576
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…s if we know that we already decoded all well-known attributes. Fixes https://devdiv.visualstudio.com/DevDiv/_workitems?id=537870.
AlekseyTs
added
Area-Compilers
Tenet-Performance
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@dotnet/roslyn-compiler Please review a fix for a perf regression in 15.6 |
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@dotnet/roslyn-compiler Please review a fix for a perf regression in 15.6 |
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Fixes https://devdiv.visualstudio.com/DevDiv/_workitems?id=537870.
Customer scenario
Compilers unnecessary request syntax trees, which has negative perf impact for some IDE scenarios when the trees are unloaded from memory.
Bugs this fixes
https://devdiv.visualstudio.com/DevDiv/_workitems?id=537870
Workarounds, if any
None
Risk
Low, very localized, simple fix. The code path has good code coverage by unit-tests.
Performance impact
Should improve performance because no extra allocations/no complexity changes and the fix prevents compiler from doing unnecessary work.
Is this a regression from a previous update?
Yes.
Root cause analysis
Caught by an existing RPS test
How was the bug found?
Caught by an existing RPS test
Test documentation updated?
N/A