I never used LLVM so I'm looking at the manual right now. It's explained here:
http://llvm.org/docs/CommandGuide/llc.html#cmdoption-mcpu It autodetects the cpu and optimizes for it. As I understand, in order to produce generic code you should pass -mcpu=i686 or -mcpu=x86_64. They can be passed to the ghc via -optlc, e.g. -optlc="-mcpu=x86_64". I'm going to look more carefully to see what is the best option to pass. On Sun, Apr 27, 2014 at 10:32 PM, Magnus Therning <mag...@therning.org>wrote: > On Sun, Apr 27, 2014 at 10:16:30PM +0200, Nicola Squartini wrote: > > Is it possible that LLVM automatically optimizes for your > > architecture or triggers the use of some simd that is not present on > > my AMDs? > > I suppose that might be the case. It is possible to pass options to > specific parts of the compilation process, but I have never looked at > any of this before so help would be very appreciated. > > /M > > -- > Magnus Therning OpenPGP: 0xAB4DFBA4 > email: mag...@therning.org jabber: mag...@therning.org > twitter: magthe http://therning.org/magnus > > Perl is another example of filling a tiny, short-term need, and then > being a real problem in the longer term. > -- Alan Kay >
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