bytecodealliance / bytecodealliance/wasmtime
x64: Improve codegen of the relaxed f32-to-u32 instructions
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cranelift:area:x64
wasm-proposal:simd
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- Rust
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Description
The `i32x4.relaxed_trunc_f32x4_u` and `i32x4.relaxed_trunc_f64x2_u_zero` instructions currently unconditionally delegate to the `i32x4.trunc_sat_f32x4_u`-style instructions. For the x64 backend specifically these are not the optimal lowerings of these instructions and it would be best to fill these out.
The [upstream issue](https://github.com/WebAssembly/relaxed-simd/issues/21) has some more information and some examples at lowerings. I suspect that new lowerings for these instructions will want to consult v8/spidermonkey and their current status as well.
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