With LLVM 20 the SIMD intrinsic `wasm32::u8x16_sub_sat` is compiled to a function call

[hkratz]

The WASM SIMD intrinsic std::arch::wasm32::u8x16_sub_sat used to be compiled to the WASM instruction i8x16.sub_sat_u. Since the switch LLVM 20 (bisected) it is compiled to call llvm.wasm.sub.sat.unsigned.v16i8

Other intrinsics (e.g. saturated integer addition) do not seem to be affected.

Godbolt

[hkratz]

@rustbot label +A-llvm +A-SIMD +O-WASM

[nikic]

This is already fixed in stdarch (rust-lang/stdarch#1719), but needs the update to be pulled in.