[gem5-users] Difference between XBase and XURa .isa operands

[Pedro Becker via gem5-users]

Hi all, 

I'm extending the ARM ISA with a custom Load macroop.
I saw that some memory instructions (neon especially) refer to "XURa" operand 
in .isa
when referring to the register that contains the base address for the load, 
while "normal"
loads will refer to the "XBase" operand. 
Both are of type "intRegX64", apparently.

Any reason why both operands exist and guidelines on when should I use one or 
another?

Thank you, 
Pedro.
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