On 6/29/13 11:24 PM, Vincent Habchi wrote:
Folks,
now that clang-3.3 is out and we have at least one Haswell machine in the wild
(the one I’m using presently), I guess it would be nice to enable -march=native
(which would, in turn, switch -mavx or -mavx2 on depending on the actual
underlying arch), at least for ports that do a lot of intensive computing, e.g.
maths or physics related (py-numpy/py-scipy/metis/arpack/cgal/proj/…).
I’ve already modified Atlas in that way. I know this breaks compatibility with
binary archives, so I think the best way would be to add a dedicated option
(+native ?) that would override the regular flags and unleash the compiler.
People seeking for ultimate performance could set it as a default in
variants.conf.
My only comment is that +native is ambiguous, maybe name it +arch-native
or +march-native?
Blair
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