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How to build/optimize for Haswell (AVX2) ?

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Hello,

I am pretty new to dolphin and just upgrded my old HTPC from a AMD X2 215 to a i3 4130 which should perform three times faster than my old cpu (I hope).
Now I'm thinking about to build my own dolphin binary optimized for the 4th gen Intel Core-i cpu.

My os is Kubuntu 14.04 with gcc 4.8.2. I would even be willing to update to gcc 4.9 which supports AVX2 if that offers some advantages.

Can someone give me a tip what to consider to build an optimized binary for this specific cpu?

ty

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