Abstract
One interesting trend of SIMD architecture is towards Vector Length Agnostic (VLA) designs. For example, ARM new vector ISA, Scalable Vector Extension (SVE), and RISC-V vector extension are adopting such a direction. VLA decouples the vector register length from the compiled binary so that the same executable could run on different implementations of vector length. However, in the current application world, the majority of SIMD code is fixed-length based, such as ARM-NEON, x86- SSE, x86-AVX, and traditional vector machines. Therefore, how to migrate legacy SIMD code to VLA architecture would be an interesting and important technical challenge.
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