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In clang, the -Og flag is intended to run optimizations that will not significantly reduce the quality of the program's debug information. Rather than making informed decisions about which optimizations will preserve debug info, this flag currently uses the -O1 pipeline, to run a few optimizations and hope that debug info will not be significantly affected.
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It is a truth universally acknowledged that representing LLVMs debug-info with intrinsics is a poor design, slowing compile-time performance and creating new categories of bugs. However, removing them is not easy as our APIs lack a way of describing instruction positions from outside of the instruction list. In this talk I'll illustrate what's bad about the current design and explore the design space of possible solutions.
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LLVM generates suboptimal debug variable locations for variables in memory in optimised code. We’ve been prototyping a new debug intrinsic which enables LLVM to make smarter decisions for these variables by connecting stores and source assignment markers. In this talk I will briefly outline the problem with the existing system, how the new system works, including how existing passes are affected and discuss the accuracy and coverage improvements we've found so far.
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