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Pemalite said:

Exactly. ;)

Another piece of tidbit is that shader model 6 goes one step further than SPIR-V in terms of exposing more features from the GCN microachitecture ... 

WaveOnce and GlobalOrderedIncrement along with WaveGetOrderedIndex are pretty specific to AMD ... (DPP from GCN3 is also a good idea for implementing quad swizzles)