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...compiler may choose to replace the implementation with a call to itself (e.g. https://godbolt.org/z/eg0p_E) Using `-fno-builtin-memcpy` prevents the compiler from understanding that an expression has memory copy semantic, effectively removing `@llvm.memcpy` at the IR level : https://godbolt.org/z/lnCIIh. In this specific example, the vectorizer kicks in and the generated code is quite good. Unfortunately this is not always the case: https://godbolt.org/z/mHpAYe. In addition `-fno-builtin-memcpy` prevents the compiler from understanding that a piece of code has the memory copy semantic but does no...