#15519: Minor code refactoring leads to drastic performance degradation -------------------------------------+------------------------------------- Reporter: danilo2 | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 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 danilo2): Ok, I've got one more important notice. If I put the `NOINLINE` pragma on the `runTokenParser` function, the `test0` is working 14 times slower. And this is interesting because `runTokenParser` does a simple pattern matching and then evaluates the `Text.span` function. So the `Text.span` (mapping a function to 100000 Chars) takes a tiny fraction of time of this computation. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15519#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler