There's (at least) two vectorisers in LLVM. One does loops, the other acts on basic blocks. https://llvm.org/docs/Vectorizers.html#the-slp-vectorizer https://ll

There's (at least) two vectorisers in LLVM. One does loops, the other acts on basic blocks. https://llvm.org/docs/Vectorizers.html#the-slp-vectorizer https://llvm.org/docs/Vectorizers.html#the-slp-vectorizer. Both really like alignment metadata on pointers. They certainly have limitations but the hit rate is reasonably good.