RealView Compilation Tools Assembler Guide: 5.5.2. NEON and VFP data types

5.5.2. NEON and VFP data types

Data type specifiers in NEON and VFP 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. Table 5.5 shows the data types available in NEON instructions. Table 5.6 shows the data types available in VFP instructions.

Table 5.5. NEON data types

	8-bit	16-bit	32-bit	64-bit
Unsigned integer	`U8`	`U16`	`U32`	`U64`
Signed integer	`S8`	`S16`	`S32`	`S64`
Integer of unspecified type	`I8`	`I16`	`I32`	`I64`
Floating-point number	not available	`F16`	`F32` (or `F`)	not available
Polynomial over {0,1}	`P8`	`P16`	not available	not available

Table 5.6. VFP data types

	16-bit	32-bit	64-bit
Unsigned integer	`U16`	`U32`	not available
Signed integer	`S16`	`S32`	not available
Floating-point number	`F16`	`F32` (or `F`)	`F64` (or `D`)

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.

Note

Most instructions have a restricted range of permitted data types. See the instruction pages for details. However, the data type description is flexible:
- If the description specifies I, you can also use S or U data types
- If only the data size is specified, you can specify a type (I, S, U, P or F)
- If no data type is specified, you can specify a data type.
The F16 data type is only available on systems that implement the half-precision architecture extension.

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