FWIW I've found that compilers' code generation around intrinsics is often suboptimal in pretty obvious ways, moving data around needlessly, so I resort to asse

FWIW I've found that compilers' code generation around intrinsics is often suboptimal in pretty obvious ways, moving data around needlessly, so I resort to assembly. For me this has just been for hobby side projects, but I'm sure people doing it for stuff that matters run into the same issue.