2009/3/9 Claus Reinke
NOINLINE, do you still get the optimizations you want? There are probably a few GHC optimizations that can "look through" non-recursive lets, but RULES are not among those.
The benefit that comes immediately to mind is extra freedom for the code generator. If we have several copies of the body of e.g. a loop it may be able to schedule instructions much better. This is why GCC unrolls loops, of course. Of course, Core may not be the best place to do this sort of unrolling as Roman pointed out earlier in the thread. But yeah, beyond this I don't /think/ that non-inlined duplications would help GHC at all (it might be a different story if we did partial inlining). All the best, Max