Serge D. Mechveliani wrote:
What is the difference between ghc-6.8.2 and ghc-6.8.3 ?
Compile times were improved by 4.3% over the nofib suite between 6.8.2 and 6.8.3. Code size was unaffected (down 0.2%). Runtime and allocation were also about the same. That's not to say that we don't believe you - we know for sure that DoCon is experiencing a regression with 6.8.3. However, we looked into it and decided to release despite this regression for two reasons - it wasn't possible to fix it quickly, and we don't believe there's a widespread regression here. But any regression is bad, and we'll make it a high priority to fix this for 6.10.1.
But I am not an expert and do not see in what point 6.8.3 is better, at least the DoCon performance is not greater. I do not know, maybe some bugs are fixed, and a bug fix often costs some code increase, and a bug fix is good.
There are 112 ways in which 6.8.3 is better than 6.8.2 :-) http://hackage.haskell.org/trac/ghc/query?status=closed&milestone=6.8.3&order=priority Cheers, Simon