Johan,

from a Windows (or Mac for that matter), I have built the dev libraries with the following flags: "-std=c++11 -O3 -ffast-math -ftree-vectorize"

Hope that helps.

Thanks,
Partha



On Thu, May 15, 2014 at 5:56 PM, Johan Engelen <jbc.engelen@...2592...> wrote:
Hi all,
  Why do we build with -O2 instead of O3?
We are missing out on:
-O3:  Optimize yet more. -O3 turns on all optimizations specified by -O2 and also turns on the -finline-functions, -funswitch-loops, -fpredictive-commoning, -fgcse-after-reload, -ftree-loop-vectorize, -ftree-slp-vectorize, -fvect-cost-model, -ftree-partial-pre and -fipa-cp-clone options.

regards,
  Johan


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