@us2012 That's probably a very bad idea if for no other reason than that the kernel isn't designed for it, and you may unexpectedly clobber user-space SIMD register values (or user-space may clobber values left there by the kernel code). Messing with kernel compile flags is just generally a bad idea, it tends to break things, either by turning up obscure GCC bugs, or breaking low-level assumptions. Unless you're doing research, compile flag choices are best left to the kernel devs. You don't want to play with them just trying to squeeze more performance out of your system.
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