[llvm-dev] RFC: Pass Execution Instrumentation interface

[George Burgess IV via llvm-dev]

FWIW, I was able to use the EarlyCSE debug counters without issue in a
Release build with -DLLVM_ENABLE_ASSERTIONS=Yes. Further, the only
preprocessor checks I see around debug counters use `NDEBUG`. Am I missing
something?

It seems reasonable to me to require that assertions are on when you're
trying to debug the compiler. Not so much to require that the compiler
itself has been built with `-O0` :)

On Wed, Jun 13, 2018 at 1:44 PM David A. Greene via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Fedor Sergeev <fedor.sergeev at azul.com> writes:
>
> > My problem with debug counters is that they are ... well ...
> > debug-only :)
> > I was planning to use debug counters for the purpose of pass execution
> > counting but then
> > realized that it will not work in Release mode at all.
> >
> > But other than that debug counters seems to be a exactly a machinery
> > designed for opt-in control of internal pass activity.
>
> Why were debug counters made debug-only in the first place?  We
> certainly use our -pass-max stuff in release builds.  Most of the time a
> debug build is fine but for some codes a debug build is way too slow to
> allow bisecting in a reasonable amount of time.
>
>                               -David
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