2a9f458ea3
When shuffling values from two different registers, the x64 lowering for `i8x16.shuffle` must first shuffle each register separately and then OR the results with SSE instructions. With `VPERMI2B`, available in AVX512VL + AVX512VBMI, this can be done in a single instruction after the shuffle mask has been moved into the destination register. This change uses `VPERMI2B` for that case when the CPU supports it.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.