[llvm-dev] Preserving debug metadata across optimization

[Jeremy Morse via llvm-dev]

Hi Jan,

On Thu, Feb 21, 2019 at 4:07 AM Jan Vesely via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I've recently run into a problem of missing !dbg metadata after the
> code has been optimized (even opt -O1).
>


> After optimizing the module (even opt -O1) I see that some
> instructions (~25%) don't have any dbg metadata.
>


> The behaviour persists across llvm-6/7/git.
> Is it just a series of bugs that I'm hitting?
>

"A series of bugs" is quite likely, many optimisation passes could preserve
debug information better.

If you happen to have a reproducer, it'd be great if you could file a bug
report blocking one of these umbrella bugs [0, 1] so that it gets looked at.

[0] https://bugs.llvm.org/show_bug.cgi?id=38768
[1] https://bugs.llvm.org/show_bug.cgi?id=31268

--
Thanks,
Jeremy
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