This surprises a lot of programmers. A barrel shifter is a big circuit for an ALU. Smaller than a multiplier obviously, but much larger than a ripple carry adder and somewhat larger even than the fancy pipelined adders used in fast CPUs.

It's the kind of thing that got skimped on in Atom. Lots of stuff runs surprisingly slow on Atom. Another one I find striking is that there are two pipes for ADD/SUB instructions, but ADC/SBB (the carry/borrow variants) are not just single-issue, but apparently unpipelined. Intel lists their throughput at 3 instead of 0.5!