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2016 Oct 07
7
Debug info interacting with optimization and code generation
...es identical. For brevity, in the rest of the mail, I'll refer to this requirement as "codegen consistency" (any better name?) Unfortunately, LLVM does not guarantee codegen consistency. Recently, I've spent quite some time try to fix related issues (e.g. https://reviews.llvm.org/D25286 and https://reviews.llvm.org/D25098). The most recent issue I'm looking at is that during isel, the IROrder is used by both debug info and the actual codegen, which is relative harder to fix. I initially thought that it's just a couple of careless bugs to fix. But looks like there are much...