Right, but the use of bitwise AND, and the repeated conditional expressions are the kind of weirdness I’d expect a good compiler to not need. I’ve worked a lot

Right, but the use of bitwise AND, and the repeated conditional expressions are the kind of weirdness I’d expect a good compiler to not need. I’ve worked a lot on the kernel and I’m no stranger to optimized code. This is still really weirdly written, and in fact the assembly is much more readable, which is funny. I know clang needs a lot of prodding to output good code (compared to gcc), but I’m curious whether even clang really needs the logic to be so warped.