On Sun, Dec 28, 2008 at 1:38 AM, Thomas DuBuisson < [email protected]> wrote:
> getNthWord n bs@(PS ptr off len) = > inlinePerformIO $ withForeignPtr ptr $ \ptr' -> do > let p = castPtr $ plusPtr ptr' off > peekElemOff p n > > But even this low level code seems to be excessively slow with 33% of > the MD5 run time attributed to this function. I ment to investigate > this a couple months ago but have had zero time. > The overhead here is very probably caused by withForeignPtr. In similar cases, I've seen much better performance from hoisting this to the outside of a loop.
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