On 03/12/2013 03:01 PM, Johan Tibell wrote: > On Tue, Mar 12, 2013 at 7:09 AM, Geoffrey Mainland <mainl...@apeiron.net> > wrote: > > Unboxed vectors are allocated by GHC, and it does not align memory on > 16-byte boundaries, so our first cut at SSE intrinsics simply used > unaligned accesses. Obviously with ForeignPtr's we can control alignment > and potentially use the aligned variants of SSE instructions, but this > will almost double the number of primops. One could imagine extending > our fusion framework to transition to aligned move instructions. > > > When I implemented the memcpy primops I added an optional alignment > parameter (rather than a new primop) to each primop. LLVM uses the > same setup. Perhaps it could work for you? > > -- Johan
LLVM needs to know statically whether or not an SSE move is aligned---it can't be computed at runtime. I don't think passing an extra Int# argument (or whatever) to a primop is going to work. Geoff _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
