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Advanced SIMD data types in A32/T32 instructions
Most Advanced SIMD instructions use a data type specifier to define the size and type of data that the instruction operates on.
Data type specifiers in Advanced SIMD 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 following table shows the data types available in Advanced SIMD instructions:
Table 9-2 Advanced SIMD 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 |
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 descriptions for details. However, the data type description is flexible:If the description specifies I, you can also use the 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.