#13397: Optimise calls to tagToEnum# -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): I got rather different results from nofib, attached above. Note that these are for a full recompilation from scratch. Judging from the Size column in your nofib output, I guess that you probably also did a full recompilation from scratch. In the program that regressed the most in my nofib run, tak, it looks like the code generator just output basic blocks in a different order. Probably the order of the `then` and `else` branches of a conditional got reversed. tak is known to be very sensitive to (poorly-understood) alignment effects (#8279) so I'm inclined to assume this is just noise that we can't do much about. Not really sure what to make of the larger regressions that you saw, or why I can't reproduce them. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13397#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler