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On 5 June 2013 11:59, David Tweed <david.tweed at arm.com> wrote: > (I've very rarely had O3 optimzation, rather than some program specific > subset of the options, acheive any non-noise-level speed-up over O2 with > gcc/g++.) > Hi David, You surely remember this: http://plasma.cs.umass.edu/emery/stabilizer "We find that, while -O2 has a significant impact relative

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