#11533: Stack check not optimized out even if it could be -------------------------------------+------------------------------------- Reporter: jscholl | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.3 (CodeGen) | Resolution: fixed | Keywords: cmm Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1881 Wiki Page: | -------------------------------------+------------------------------------- Comment (by thomie): For the record, [https://perf.haskell.org/ghc/#revision/4ec61411930495fc109be27993c176fd7aaf4... perf.haskell.org] reports: {{{ nofib/time/fannkuch-redux 2.727 + 4.66% 2.854 seconds }}} On Phab, Jonas said: "I think nofib contained maybe between 20 and 40 cases where the the stack check was incorrectly not dropped. I could not measure a performance difference, but binary size decreased by a few bytes (as one would expect)" `fannkuch-redux` has been investigated for performance regressions before: #7367, #10457, #10677, #10844, https://phabricator.haskell.org/rGHCb949c96b4960. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11533#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler