[PATCH] D59431: [DebugInfo] Terminate constant-value location-list ranges at the end of basic blocks

[Greg Bedwell via Phabricator via llvm-commits]

gbedwell added a comment.

In D59431#1436497 <https://reviews.llvm.org/D59431#1436497>, @aprantl wrote:

> "at the start of compilation" really means in mem2reg, at least for Clang. As you pointed out, there is no way to preserve the dbg.value in the exit block in mem2reg without introducing an phi node, but doing so would change codegen, which is not an option.


Without wanting to stray too far off the topic at hand, this is the sort of thing we could consider doing if we had a dedicated -Og mode (and presumably a corresponding optdebug IR attribute akin to optsize/minsize).  FWIW I'm going to organise a roundtable at EuroLLVM to try and kick off some discussion in that area, although obviously I'll reflect everything of importance back to the list for those who aren't able to attend.


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https://reviews.llvm.org/D59431