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Hi, I intended to file this bug on Bugzilla, but I've received no response from llvm-admin in the 10 days since asking for a Bugzilla account. I've written 2 test functions in C that take in a float array x of size n and output float array f(x), where f is either fabsf or logf. The LLVM 3.9 auto-vectorization docs claim that both functions will be vectorized: