CamHac/PostHackathonReport

Post-Hackathon Report

This page is for listing what was done during the Hackathon. Please add a short description of what you worked on, with links to relevant blog posts, hackage packages, commits, etc.

fclabels 1.0 release

New release of the fclabels package. The new package has a lot of code and documentation cleanups, support for partial labels in the case of multi-constructor datatypes and is about 20x as fast for setting and modifying as the previous version. Thanks everyone for helping me out!

Hackage: http://hackage.haskell.org/package/fclabels-1.0.1

Github: http://github.com/sebastiaanvisser/fclabels

GHC and base library improvements

• Add primops for bit population count. These primops compile down to `POPCNT` instructions where available and fast fallbacks (implemented in C) otherwise.

• Add unchecked left and right bit shifts: The Data.Bits.shift method uses a branch to check if the shift amount is larger than the word size and returns 0 in these cases. This extra safety makes performance worse in bit twiddling code.

• Discussed unpacking of enums in GHC (not yet implemented).

Darcs

New contributors:

• use red text to report when we have a conflict (issue1681,[1], Jeff Foster)
• support 'since' in English dates parser
• filter SSH output (issue845, Jeff Foster and Sebastien K)
• support arbitrary darcs command in darcs-test (Alexander N)
• output ISO dates in darcs changes? (issue140, Alexander N, may be not a good idea)