riccibruno added a comment.

In D60561#1464740 <https://reviews.llvm.org/D60561#1464740>, @Tyker wrote:

> @rsmith i don't think collecting theses values is expansive compared to 
> evaluating the expression.
>  but i agree that we can disable the collection of these values when no 
> diagnostics can be emited.


To help make an informed decision you can grab a big TU (I usually use 
`SemaDecl.cpp` or all of Boost) and then run `-fsyntax-only` on it. With a tool 
like `perf stat` you can get pretty good results.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60561/new/

https://reviews.llvm.org/D60561



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