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It corresponds to WebAssembly's `load*_splat` operations, which were previously represented as a combination of `Load` and `Splat` instructions. However, there are architectures such as Armv8-A that have a single machine instruction equivalent to the Wasm operations. In order to generate it, it is necessary to merge the `Load` and the `Splat` in the backend, which is not possible because the load may have side effects. The new IR instruction works around this limitation. The AArch64 backend leverages the new instruction to improve code generation. Copyright (c) 2020, Arm Limited.
This crate performs the translation from a wasm module in binary format to the in-memory form of the Cranelift IR.
If you're looking for a complete WebAssembly implementation that uses this library, see Wasmtime.