src/librustc_codegen_llvm/README.md

   1 The `codegen` crate contains the code to convert from MIR into LLVM IR,
   2 and then from LLVM IR into machine code. In general it contains code
   3 that runs towards the end of the compilation process.
   4
   5 For more information about how codegen works, see the [rustc dev guide].
   6
   7 [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/backend/codegen.html