Professional Embedded ARM Development

Appendix D

NEON Intrinsics and Instructions

This appendix contains information on, and a list of instructions used with, the NEON engine. Data types, lane types, and intrinsics are listed.

DATA TYPES

Table D-1 lists the different data types supported on the NEON engine, and the corresponding C data types.

TABLE D-1: NEON Data Types

DATA TYPE	D-REGISTER (64 BITS)	Q-REGISTER (128 BITS)
Signed integers	int8x8_t	int8x16_t
int16x4_t	int16x8_t
int32x2_t	int32x4_t
int64x1_t	int64x2_t
Unsigned integers	uint8x8_t	uint8x16_t
uint16x4_t	uint16x8_t
uint32x2_t	uint32x4_t
uint64x1_t	uint64x2_t
Floating-point	float16x4_t	float16x8_t
float32x2_t	float32x4_t
Polynomial	poly8x8_t	poly8x16_t
poly16x4_t	poly16x8_t

LANE TYPES

Table D-2 lists the different lane types per class, and the amount of possible types for each class.

TABLE D-2: Data Lane Types

CLASS	COUNT	TYPES
int	6	int8, int16, int32, uint8, uint16, uint32
int/64	8	int8, int16, int32, int64, uint8, uint16, uint32, uint64
sint	3	int8, int16, int32
sint16/32	2	int16, int32
int32	2	int32, uint32
8-bit	3	int8, uint8, poly8
int/poly8	7	int8, int16, int32, uint8, uint16, uint32, poly8
int/64/poly	10	int8, int16, int32, int64, uint8, uint16, uint32, uint64, poly8, poly16
arith	7	int8, int16, int32, uint8, uint16, uint32, float32
arith/64	9	int8, int16, int32, int64, uint8, uint16, uint32, uint64, float32
arith/poly8	8	int8, int16, int32, uint8, uint16, uint32, poly8, float32