I am working on http://www.peachpy.io (an academic project) which lets performance tuning experts optimize assembly kernels for various x86-64 microarchitectures. We currently have Intel Nehalem, Intel Ivy Bridge, Intel Haswell, Intel Broadwell, Intel Skylake, AMD Piledriver, AMD Steamroller, Intel Bonnell (1st-gen Atom) and AMD Bobcat in the pool.

Source code:

- https://github.com/PeachPy

- https://github.com/Maratyszcza/PeachPy