Awesome! Please post a link to the new version on devs when it lands! (I'm not quite at the point where I can keep up with the full commits firehose yet).  This is very relevant for me. 

On Friday, March 7, 2014, Johan Tibell <johan.tibell@gmail.com> wrote:
With Simon's help I figured it out. I'm now refactoring StgCmmPrimOp so it's easier to have primops that have both inline and out-of-line implementations in the future.


On Fri, Mar 7, 2014 at 3:19 PM, Carter Schonwald <carter.schonwald@gmail.com> wrote:
Have you looked at some of the lowering code for other primops? What info are you missing?  


On Friday, March 7, 2014, Johan Tibell <johan.tibell@gmail.com> wrote:
Hi,

I'm trying to make allocation of arrays of small, statically-known size inline. For large or unknown size I just want to call the existing stg_newArrayzh function. In code:

doNewArrayOp :: DynFlags -> CmmFormal -> CmmExpr -> FCode ()
doNewArrayOp dflags res_r (CmmLit (CmmInt n _)) | n <= inlineAllocLimit = do
    -- Do everything inline.
doNewArrayOp dflags res_r n = do
    emitCallTo "stg_newArrayzh" res_r n  -- HERE

The question is: how do I emit a call to stg_newArrayzh, which is defined in PrimOps.cmm?

-- Johan