#13851: Change in specialisation(?) behaviour since 8.0.2 causes 6x slowdown -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 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: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * cc: simonpj (added) Comment: The bulk of the increase in runtime is due to 2effe18ab51d66474724d38b20e49cc1b8738f60 (The Early Inline Patch): {{{ Commit 55efc9718b520ef354e32c15c4b49cdfecce412f (Combine identical case alternatives in CSE) ----- $ time ./MultiBench2 real 0m2.786s user 0m2.784s sys 0m0.000s Commit 2effe18ab51d66474724d38b20e49cc1b8738f60 (The Early Inline Patch) ----- $ time ./MultiBench2 real 0m11.861s user 0m11.816s sys 0m0.052s }}} (I'm not sure yet what contributes to the other 0.5 seconds in runtime increase.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13851#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler