This applies the pmadd handler (recently improved in https://github.com/llvm/llvm-project/pull/153353) to the Avx512 equivalent of the pmaddw and pmaddubs intrinsics: <16 x i32> @llvm.x86.avx512.pmaddw.d.512(<32 x i16>, <32 x i16>) <32 x i16> @llvm.x86.avx512.pmaddubs.w.512(<64 x i8>, <64 x i8>)