On Thu, May 16, 2013 at 10:59:03AM +0200, Henning Thielemann wrote:
If it would work on bits, I would certainly not call it swap, but 'reverse'. On the MC68000 processor there was an assembly instruction "swap" that swapped upper and lower 16 bits of a 32 bit word.
However if you really only want to swap byte order (and not 16 bit words within 64 bit words and so on), then how about just using a package like 'endian':
http://hackage.haskell.org/packages/archive/data-endian/0.0.1/doc/html/Data-...
I'm sorry, i completely forgot to put the rationale of this in the original proposal. http://hackage.haskell.org/trac/ghc/ticket/7902 The point of this exercise is to expose some new primops that swap bytes efficiently (by generating the proper assembly code), not using an existing package. -- Vincent