[llvm-commits] XOP Feature flag

David A. Greene greened at obbligato.org
Fri Dec 2 09:36:53 PST 2011

Jan Sjodin <jan_sjodin at yahoo.com> writes:

> No it is not possible to have FMA4 wihtout XOP, and if a processor
> supports them AVX is also supported. I suppose it would be possible to
> combine the FMA4 and XOP flags to FMA4XOP or something.

I'm not sure we should do that.  They are different feature flags in
CPUID.  I can certainly imagine low-end processors without FMA4.

It's also useful to turn off various instruction set parts for debugging


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