Automatic PGO - Initial implementation (1/N)

[Renato Golin]

On 24 September 2013 19:38, Eric Christopher <echristo at gmail.com> wrote:

> -gline-tables-only (or -gmlt in gcc parlance). This will give you
> accurate call stack information for each sample. Or at least as
> accurate as I can get it.
>

FWIW, I'm using perf with "-O3 -g" and LLVM has retained the line
information quite well throughout all the inlining and optimizations that
happened.

I assume it's easier to keep line information than variable location ranges
and types. The biggest problem is to separate the two emissions, I guess,
not the quality of the resulting information.

cheers,
--renato
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