#5113: Huge performance regression of 7.0.2, 7.0.3 and HEAD over 7.0.1 and 6.12 (MonoLocalBinds) -------------------------------------+------------------------------------- Reporter: | Owner: daniel.is.fischer | Status: closed Type: bug | Milestone: Priority: normal | Version: 7.0.3 Component: Compiler | Keywords: Resolution: fixed | performance, MonoLocalBinds Operating System: Linux | Architecture: x86 Type of failure: Runtime | Test Case: performance bug | perf/should_run/T5113 Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonpj): The new `substExprS` was dropping rules and specialisations, which is terribly wrong. So I backed out and fixed #10527 another way; see the commit comments. I'm getting a small number of apparently-unrelated validate failures, but I figure it's better to push this so that Ben can try it out. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5113#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler