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 Single instruction on RV, and x86, but multiple on Power. Needs investigation, particularly as to why cache flush exists.
 
+https://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
+
 # FP16
 
 Doesn't exist in Power, need to work out suitable opcodes, basically means duplicating the entire range of FP32/64 ops, symmetrically.