#13763: Performance regression (~34%) in 8.2.1, poor register allocation(?) in an inner loop over an array -------------------------------------+------------------------------------- Reporter: jberryman | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (NCG) | Version: 8.2.1-rc2 Resolution: | Keywords: JoinPoints 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: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: kavon@… (added) Comment: I'm puzzled. The changes in comment:3 change `letrec` into `joinrec`, which ought to be a straight win. I'm adding Kavon in cc because he is interested in this back-end stuff. More insight into where the regression comes from would be helpful, if anyone has time to dig in. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13763#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler