Commit message of rL334303 said:
As detailed on Agner's Microarchitecture doc (21.8 AMD Bobcat and Jaguar pipeline - Dependency-breaking instructions), these instructions are dependency breaking and fast-path zero the destination register (and appropriate EFLAGS bits).
That very section also listed PCMPEQx right before PCMPGTx in that very list.
So these are also dependency-breaking, although they produce ones and still consume resources.
Found accidentally while continuing trying to look into bdver2 scheduling profile..