Hi,<div><br></div><div>In order to do a performance comparison beetween different approaches for our application, I make different implementation of a simple example (computing the norm of a vector expression.</div><div>I rely on Repa to do this. </div>

<div>However, when I tried to build the parallel version (-threaded -fvectorise -rtsopts), I got an error specifying that dph-par was not available. Indeed, It wasn&#39;t.</div><div><br></div><div>As explained on the dph webpage, I installed a developpment version of ghc (ghc-7.1.20110331).</div>

<div>However, when I try to build my application, I get the folowing error:</div><div><div>user error (Pattern match failure in do expression at compiler/vectorise/Vectorise/Monad.hs:57:10-20)</div></div><div><br></div><div>

My source code is attached and compiled with the following line:<br>ghc haskell.hs -O3 -XBangPatterns -msse2 -fforce-recomp -rtsopts -threaded -fvectorise</div><div><br></div><div><br></div><div>So my question is : is the problem concerning the pattern matching known ? If yes, is there a workaround ?</div>

<div>is there an other version of dph that would work with Repa ? </div><div><br></div><div>Thank you !</div><div><br></div><div>-----<br>Wilfried Kirschenmann<br><br>&quot;An expert is a person who has made all the mistakes that can be made in a very narrow field.&quot;<b><br>

</b>Niels Bohr - <i>Danish physicist (1885 - 1962)</i><br>
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