Bit math (bfe.*, logical bit ops, ...) are nowhere near as fast as float32 ops on their GPUs by a factor of 2-4x; there are many fewer functional units for them

Bit math (bfe.*, logical bit ops, ...) are nowhere near as fast as float32 ops on their GPUs by a factor of 2-4x; there are many fewer functional units for them. Maxwell doesn't have support for many 64-bit word bit ops as well (they get emulated in SASS using the operations that they do have; e.g. bfe bitfield extract), so you'd have to do it in uint32. Issue rate is in the CUDA documentation for Maxwell (cc 5.2) at least, presumably they'll update with Pascal soon: http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#arithmetic-instructions http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.h... Where they would win is in memory bandwidth for intermediate results (e.g., in/out of registers or smem or even global memory), assuming that you aren't ultimately bound by I/O over the bus from the CPU.