Yeah, once I tried writing out a dumber popcount loop (checking each bit) for better readability, and was annoyed to find that GCC and Clang didn't recognize it

Yeah, once I tried writing out a dumber popcount loop (checking each bit) for better readability, and was annoyed to find that GCC and Clang didn't recognize it. I ended up looking into the source of both compilers to find that they only transform the more 'idiomatic' version.