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NEON intrinsics provided by the compiler

As an alternative to automatic compiler vectorization, NEON intrinsics provide an intermediate step between a vectorizing compiler and writing assembly language for SIMD code generation.

This feature makes it easier to write code that takes advantage of the NEON architecture when compared to writing assembly language directly.

NEON intrinsics are defined in the header file arm_neon.h. The header file defines both the intrinsics and a set of vector types.

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