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Views of the Advanced SIMD register bank in AArch32 state

Advanced SIMD can have different views of the extension register bank in AArch32 state.

It can view the extension register bank as:

  • Sixteen 128-bit registers, Q0-Q15.
  • Thirty-two 64-bit registers, D0-D31.
  • A combination of registers from these views.

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.