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Professional Embedded ARM Development by James A. Langbridge

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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

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