That's really interesting to hear. I tried Duff's Device myself, once upon a time, and found it made no measurable difference, so I pulled it back out. This was

That's really interesting to hear. I tried Duff's Device myself, once upon a time, and found it made no measurable difference, so I pulled it back out. This was a long time ago, so I had just assumed that a similar optimization was just built into most C compilers these days. Does it vary by toolchain? I believe I was using clang at the time. (I was still quite wet behind the ears at the time, so it's also more than possible that I was just doing something wrong.) All that said, agreed, wonderful little mechanism. It's one of those things that every C programmer should take the time to really understand.