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As with shift left, the spec requires that the shift count is computed modulo the lane width (see https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#left-shift-by-scalar).
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.