Where are you getting that from? `pushfd` is OK-ish, but `popfd` is microcoded, requires 9 uops, and can only be issued once every ~20 cycles. That's not what I would call well-pipelined.

You could probably achieve the same result (assuming you want to avoid adc instructions, for some reason) by using setc r8 plus shr r8, 1 to get the carry back.