11 Jul
2010
11 Jul
'10
1:31 p.m.
| > caused a huge performance regression. | | You're using GHC 6.12.x presumably? There are known performance problems with | using abstract PrimMonads in that version (and, actually, just using IO as | well). ... | The good news is that, last I checked, this isn't a problem in HEAD. The | optimizer does better there somehow. The bad news is that 6.14 isn't out yet, This is the first I've heard of this. Do you have a test case that shows up the problem? Then we can put it in the regression tests so it won't go wrong again. Simon