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Hi Chandler,  > FWIW, I don't yet agree. > > > Your tables show many programs growing in code size by over 20%. While there is associated performance improvements, it isn't clear that this is a good tradeoff. Historically, optimizations which optimize as a direct result of growing code size have *not* been an acceptable tradeoff in -Os. > > > > > I am

Hi, I would like to start a discussion about enabling the loop vectorizer by default for -Os. The loop vectorizer can accelerate many workloads and enabling it for -Os and -O2 has obvious performance benefits. At the same time the loop vectorizer can increase the code size because of two reasons. First, to vectorize some loops we have to keep the original loop around in order to handle the last