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Hi Javier, I'm not the right person to answer your question, but since no one else took it: I believe this is a situation where the backend would typically emit a call the the compiler's runtime library (e.g., libgcc). While it isn't currently completely wired up, we do have our own compiler runtime library available under the compiler-rt project in the LLVM repo. - Daniel On Thu,

Hi, I'm trying to add support in my back end for certain functions that are seen as built-in by the target. Some of these functions can be implemented in a) LLVM, and some in b) the native target language. My approach to case a) is to write the built-in function implementation in C, compile it to LLVM using Clang, link it to the module that uses it and finally add a pass to inline it.

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