[Haskell-beginners] Using INLINE/NOINLINE pragma

felipe zapata tifonzafel at gmail.com
Sat Jul 7 20:33:01 CEST 2012

Hi All,

I'm being exploring the Repa Module and I got myself into a big mess trying
to figure out how to use the INLINE/NOINLINE pragma. In the paper “Guiding
parallel Array Fusion with Indexed Types” it is said that: if the signature
contains any D tags, or type class dictionaries, then you must INLINE it to
get fast code, otherwise not. But looking in the provided example of matrix
multiplication the* transpose2P *defined in the Repa-example package, do
not contain a “D” in the signature but nevertheless use the INLINE pragma.

Besides in the Numeric Haskell: A repa Tutorial in section 1.8.5 it is said
that : “... The moral of the story is to attach INLINE pragmas to all your
client functiond that compute array values...”.

Could you please give some advices about how to use those pragmas?

Thanks in advance.

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