Do modern GPUs contain barrel shifters? I'm aware that most modern GPUs, although designed for floating point, are more or less equivalent in integer performance these days, with a few caveats like the lack of a fused multiply add. I'm not sure how this applies to shift operations though. I'm doing Marching Cubes on GPU, initially writing out a 32-bit packed position for each surface cube then unpacking these in a later pass to the actual vertices in that cube, like this : 

ivec3 unpackedPos = ivec3( packedPos &gt;&gt; 20 &amp; 0x3FF,
                         packedPos &gt;&gt; 10 &amp; 0x3FF,
                         packedPos &amp; 0x3FF);


It just occurred to me to wonder if shader units have barrel shifters in them these days? Am I doing 2 shifts here or 30?

EDIT>>
I'm an idiot... Thanks for the answers guys, useful to know, but I've been going about this all wrong. I should just be using the RGB10_A2UI texture format then packing/ unpacking with a single image load/store instruction instead of messing around with bitshifts myself. 

RE_EDIT>> Or not... This method apparently works on red boxes but not on green ones, so it's back to bit-shifts.
Yes ( with 50% of the FMA 32b throughput on nVIDIA Maxwell).

See 
https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#arithmetic-instructions