Defining a custom newByteArray primop that uses calloc?

[Erik de Castro Lopo]

Brandon Simmons wrote:

> In my tests, using calloc from:
> 
>     https://hackage.haskell.org/package/missing-foreign-0.1.1/docs/Foreign-Marshal-MissingAlloc.html
> 
> was about twice as fast as allocating and zeroing the same amount of
> memory with `newByteArray` + any of `copy/set/fillMutableByteArray`
> (all three were nearly identical). Is there a way I can reasonably
> define my own `newByteArray` that uses calloc?
> 
> FWIW here are a couple of the benchmarks I'm working with in criterion:
> 
>     arrTestSet :: Int -> IO ()
>     arrTestSet len = do
>         let eBytes = (P.sizeOf (undefined::Int))*len
>         a <- P.newAlignedPinnedByteArray

Why pinned memory?

Erik
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Erik de Castro Lopo
http://www.mega-nerd.com/