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Using your C compiler to exploit NEON™ Advanced SIMD

Abstract

With the v7-A architecture, ARM has introduced a powerful SIMD implementation called NEON™. NEON is a coprocessor which comes with its own instruction set for vector operations. While NEON instructions could be hand coded in assembler language, ideally we want our compiler to generate them for us. Automatic analysis whether an iterative algorithm can be mapped to parallel vector operations is not trivial not the least because the C language is lacking constructs necessary to support this. This paper explains how the RealView compiler tools (RVCT) and other modern compilers use a blend of sophisticated analysis techniques and language extensions to fulfil their job.


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