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...rom 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 not prevent the compiler from generating calls to libc's `memcpy`, for instance: Using `__builtin_memcpy`: https://godbolt.org/z/O0sjIl Passing big structs by...