On Tue, Mar 31, 2015 at 03:49:28PM +1100, Bruce Evans wrote: > It looks a bit overengineered to me. A bit like my function pointers > for the bcopy() family on i386. bcopy() is a bulk operation, so in > theory you can do it much faster by selecting the best available > version at runtime. In practice, the gains were not large and are > too machine-dependent to maintain. It is even harder to get large > gains and maintain them by selecting individual instructions at runtime. > Yes, it is similar to bcopy. The difference in motivation is that the IFUNCs are for features, not for speed. The existing patch already demostrates this WRT self-snoop and different methods of saving FPU state.
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