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NEON views of the register bank

In NEON, you 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 the above views.

NEON 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 NEON, the 64-bit registers are called doubleword registers and the 128-bit registers are called quadword registers.