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Avoid excessive locals

TypeName

AvoidExcessiveLocals

CheckId

CA1809

Category

Microsoft.Performance

Breaking Change

Non Breaking

A member contains more than 64 local variables, some of which might be compiler generated.

A common performance optimization is to store a value in a processor register instead of memory, which is referred to as enregistering the value. The common language runtime considers up to 64 local variables for enregistration. Variables that are not enregistered are placed on the stack and must be moved to a register before manipulation. To allow the possibility that all local variables get enregistered, limit the number of local variables to 64.

To fix a violation of this rule, refactor the implementation to use no more than 64 local variables.

It is safe to suppress a warning from this rule, or disable the rule entirely, if performance is not an issue.

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