LQ instruction question -- MI400

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The LQ RISC instruction loads a quadword (16 bytes) and 
stores the tag-bits in a special register (?), but does anyone
here know exactly how it works?

A typical use is:
LQ 26,xxxx(3),2

load R26 and R27 with the 16 bytes starting at xxxx(R3). But 
what is the "2" doing. I have seen 2, 11, and 15.

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