[llvm-dev] Enable STATISTIC all the time again?

[David Blaikie via llvm-dev]

+Jan, the original contributor (from Chromium), in case he's got any
context that might be useful.

On Wed, May 31, 2017 at 7:39 AM Daniel Berlin via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Right now, the LLVM Statistic class does not increment values if we are in
> non-debug mode, unless you define LLVM_ENABLE_STATS (which, sadly, is also
> not available from cmake).
>
> Before i go and add it to cmake, i ran numbers.
>
> I can't find a single testcase, large or small, where enabling statistics
> all the time isn't completely noise.
>
> It looks like it was disabled in march  2013.
> https://reviews.llvm.org/D486
>
> The only discussion i can find in the same time period is around fastisel
> using a lot of per-instruction stats, and it causing some slow-down.
>
> However, I can't find any actual data/testcases in this discussion at all,
> and disabling stats globally is actually fairly annoying for performance
> work.
> :(
>
> Does anyone have any testcases where it is actually slow that i can look
> at?
>
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