"Interestingly enough, there are actually comparable Intel SHA extensions to the ARM equivalents. Linux 4.4 has added support for this but so far we have not been able to identify any CPUs that will actually run this code."
Intel Goldmont is the only microarch that implements the instructions. It was "released" in April: http://www.extremetech.com/computing/226800-intels-new-low-c... But it is one of these annoying soft launches where the processors are not for sale anywhere, the specs are incomplete, and even ark.intel.com doesn't know about them. sigh