On Sat, Oct 22, 2011 at 6:40 AM, David Peixotto <d...@rice.edu> wrote:
> Ok, so to do it the "quick" way would be to change the translation of the > PopCnt primop in compiler/codeGen/CgPrimOp.hs? The change would be to first > narrow the argument by generating code for the narrow primop before the code > for the PopCnt primop. > You should only have to add calls to the narrowXWord/Int in the base package. In the instance declarations for Bits in e.g. GHC.Int and GHC.Word. You should have to touch the code generator I think. > This actually makes me wonder why the native backend is calling hs_popcnt > at all? It should use the native instruction too right? The popcnt > instruction works fine with the (patched) LLVM backend so it should be ok > for the native codegen as well. It looks like the native gen is trying to > use it, but for some reason its falling back to hs_popcnt on my system (a > Nehalem MBP with OSX 10.7). > The native backend only uses the POPCNT instruction if you compile with `ghc -msse4.2`. -- Johan
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