to x86 "MMX".
Simple-V's "Vector" Registers are specifically designed to fit
-on top of the Scalar (GPR, FPR) register files, which are extended from
-32 to 128 entries. This is a primary reason why Simple-V can be added
+on top of the Scalar (GPR, FPR) register files with \textbf{(byte-addressable access required?)}, which are extended from
+ the default of 32 (see PowerISA 3.2.1 General Purpose Registers and 4.2.1 Floating-Point Registers \textbf{[WHICH SPEC VERSION?]}), to 128 entries in the Libre-SOC implementation \textbf{[CAN WE REFER TO LIBRE-SOC?]}. This is a primary reason why Simple-V can be added
on top of an existing Scalar ISA, and \textit{in particular} why there
is no need to add Vector Registers or Vector instructions.