#14737: Improve performance of Simplify.simplCast -------------------------------------+------------------------------------- Reporter: tdammers | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #11735 #14683 | Differential Rev(s): Phab:D4385 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Yes, use that defn of `isReflexiveCo`; and then delete `isReflexiveCo_maybe` because it is not otherwise called. However, that may still leave `simplCast` at the top... does it? If it was taking 78% of 20sec before, that's 16 sec. So reducing that to near-zero (which it should be) would take use to 5s, not 12s. What happens if you leave out the call to `isReflexiveCo` altogether? It'll get done in the next round anyway, by `optCoercion`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14737#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler