#14208: Performance with O0 is much better than the default or with -O2, runghc performs the best -------------------------------------+------------------------------------- Reporter: harendra | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by harendra): Another question that I am seeking an answer for - is there a combination of options to make a multi-module program behave the same way as if all the code is in a single module, from the performance perspective? I expected that `-fexpose-all-unfoldings` will do that for me but it does not seem to be equivalent. I thought it is equivalent to making all functions INLINABLE but it does not seem to be doing that. Even when using this flag I need to mark a function INLINABLE to get it inlined. What exactly does this flag do? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14208#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler