Hi, On Fri, Oct 21, 2011 at 1:34 PM, David Peixotto <d...@rice.edu> wrote:
> I believe that we should be narrowing the argument before calling the > function (and in fact both gcc and llvm-gcc will narrow it before a > call to hs_popcnt8). My question is what is the right way to do > that in the code generator? > I *think* the right way to address this is to call the one of the narrowXWord/Int# primops in GHC.Word and GHC.Int (where the Bits instances are defined). I have a vague memory of there being instances defined elsewhere to (for the CTypes newtypes). Grep for 'instance Bits' in the base package. Aside: it would be really nice if GHC had primitive types such as Word8#, etc so we don't have to remember to narrow in this way. Cheers, Johan
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