[GHC] #13570: CoreFVs patch makes n-body slower

#13570: CoreFVs patch makes n-body slower -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This commit {{{ commit 751996e90a964026a3f86853338f10c82db6b610 Author: Simon Peyton Jones Date: Fri Apr 7 17:10:07 2017 +0100 Kill off complications in CoreFVs }}} makes `n-body` in nofib go 25% slower. See [https://perf.haskell.org/ghc/#revision/751996e90a964026a3f86853338f10c82db6b... perf results page]. Investigate. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13570 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler