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On 7 June 2013 13:53, Dallman, John <john.dallman at siemens.com> wrote: > It needs to be possible to debug code at any optimisation level. > Yes, I agree. But after O1, sequential execution is a big impediment for optimizations, and keeping the debug information valid after so many transformations might pose a big penalty on the passes (time & memory). That was the whole idea

I'm not a LLVM or Clang developer, but I do spend a lot of time teasing software into working with the highest possible optimisation levels where it still works correctly. These guidelines are pretty good, but there are a few details worth considering. It needs to be possible to debug code at any optimisation level. It's acceptable for that to be harder at high optimisation levels, but