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...ill go wrong if I > do that? Is there a better way, or an option that doesn't involve > writing new code? Hi Jeffrey, Does this need to be an actual pass? You can just call the InlineFunction API to inline individual call sites as needed, check out llvm/Transforms/Utils/Cloning.h. CloneAndPruneFunctionInto is a particularly useful function if you're doing argument specialization, because it is very efficient at handling this (better than inlining a bunch of code and then deleting it as dead later). -Chris

In Unladen Swallow we (intend to) compile each function as we determine it's hot. To "compile" a function means to translate it from CPython bytecode to LLVM IR, optimize the IR using a FunctionPassManager, and JIT the IR to machine code. We'd like to include inlining among our optimizations. Currently the Inliner is a CallGraphSCCPass, which can only be run by the