Aha, yeah it's not saying that it's compiling with dxcompiler. (Only d3dcompiler_47.)
I've downloaded the stock directx compiler. Passing those flags to the compilation still doesn't say that it's compiling with dxcompiler, but I do think it's using MSFT's implementation cause there's no wine fixme spam.
If the intrinsics aren't implemented upstream, is this something we can fix at all? I guess I'm still not clear what the problem is. The point is that *this* MR implements the intrinsics, right?