>
> So, is it OK to commit this patch to trunk, and H.J's original patch + this 
> to 4.6 branch?

>I have no problems on -mtune=Bulldozer.  But I object -mtune=generic
>change and did suggest a different approach for -mtune=generic.

What's your suggested approach for -mtune=generic?

My understanding of putting something into -mtune=generic is that all are 
happy, or
some are willing to lose. This rule guided us not to turn on software 
prefetching for 
-mtune=generic.

I would like to hear your suggestion that sandy bridge could get the 
performance while
bulldozer does not lose from splitting avx256 unaligned loads!

Thanks,

Changpeng



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