On Wed, Sep 28, 2011 at 06:27:11PM +0200, Andi Kleen wrote: > > There is no separate cost-table for Nehalem or SandyBridge - however, > > I tuned generic32 and generic64 tables, that should improve > > performance on modern processors. In old version REP-MOV was used - it > > The recommended heuristics have changed in Nehalem and Sandy-Bridge > over earlier Intel CPUs.
Sorry what I meant is that it would be bad if -mtune=corei7(-avx)? was slower than generic. Adding new tables shouldn't be very difficult, even if they are the same as generic. -Andi
