[llvm-dev] [GSoC][DebugInfo] SROA debug experience and dexter thoughts

[Greg Bedwell via llvm-dev]

Thanks for this writeup!

  Passes that move code around or shorten the execution paths like SROA
>   and LICM should go to great lengths to preserve the debug intrinsics
>   that correspond the the name and value of the variables. It would be
>   an unrealistic goal to try and keep the stepping behavior inside a
>   debugger intact after running such passes.
>
>   Instead, different optimization methods can be used when debugging is a
>   high priority. Ones that don't move code around as much and of course
>   result in longer execution times, but what they lose in speed they
>   give back with a more robust debug experience.
>
>
Absolutely.  I think we should make -O2/-O3 as debugable as possible
without sacrificing performance, and then whatever is left becomes a prime
candidate for assessing whether we can get away with turning it off or
turning it down for -Og.
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