Make SIMD vector length a runtime rather than compile-time constant #600
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Make `Simd::LEN` an `Option<usize>` to represent the possibility that the vector length is unknown at compile time, but a fixed size at runtime, and add a `Simd::len` method which returns either the compile or runtime-constant size. Runtime-determined SIMD vector types (eg. Arm SVE, RVV) are not currently supported in Rust, but the expectation is that they will be eventually [^1]. This change is made in the hope that it will make it easier to support such types in future. [^1]: https://github.com/davidtwco/rfcs/blob/sized-hierarchy/text/3729-sized-hierarchy.md
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Make
Simd::LENanOption<usize>to represent the possibility that the vector length is unknown at compile time, but a fixed size at runtime, and add aSimd::lenmethod which returns either the compile or runtime-constant size.Runtime-determined SIMD vector types (eg. Arm SVE, RVV) are not currently supported in Rust, but the expectation is that they will be eventually 1. This change is made in the hope that it will make it easier to support such types in future.
Footnotes
https://github.com/davidtwco/rfcs/blob/sized-hierarchy/text/3729-sized-hierarchy.md ↩