#11781: Improve common sub-expression -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D2074 Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata):
Oh hang on. Maybe the program being compiled is changing size! Try -dshow-passes before and after.
No, no diff there (of the program with `-v -ddump-cse`) besides insignificant changes in per-pass runtime and per-pass allocation. So it must have indeed made some code path that is overly exercised by this extreme program slower. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11781#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler