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Advanced SIMD can have different views of the extension register bank in AArch32 state.
It can view the extension register bank as:
Advanced SIMD views each register as containing a vector of 1, 2, 4, 8, or 16 elements, all of the same size and type. Individual elements can also be accessed as scalars.
In Advanced SIMD, the 64-bit registers are called doubleword registers and the 128-bit registers are called quadword registers.