Data type specifiers in NEON instructions consist of a letter indicating the type of data, usually followed by a number indicating the width. They are separated from the instruction mnemonic by a point.

The type of data can be any of the following:

Floating-point numbers in NEON are always 32 bits wide. The 32 can be omitted from the data type specifier. Other data types can be 8, 16, 32, or 64 bits wide.

See Polynomial arithmetic over {0,1} for further information about operations on polynomials over {0,1}.

The datatype of the second (or only) operand is specified in the instruction.