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As Hygon Dhyana originates from AMD technology and shares most of the architecture with
AMD's family 17h, but with different CPU Vendor ID("HygonGenuine")/Family series number(Family 18h).
for CPUID feature bits, Hygon Dhyana(family 18h) share the same definition with AMD family 17h.
AMD CPUID specification is https://www.amd.com/system/files/TechDocs/25481.pdf.
Related Hygon kernel patch can be found on
http://lkml.kernel.org/r/5ce86123a7b9dad925ac583d88d2f921040e859b.1538583282.git.puwen@hygon.cn