Re: [GHC] #9740: D380 caused fft2 regressions

#9740: D380 caused fft2 regressions -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: patch Priority: normal | Milestone: 7.10.1 Component: Core | Version: 7.8.3 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Easy (less than 1 Unknown/Multiple | hour) Type of failure: Runtime | Blocked By: performance bug | Related Tickets: Test Case: | Blocking: | Differential Revisions: Phab:D394 | -------------------------------------+------------------------------------- Comment (by Joachim Breitner ): In [changeset:"64d0a198be05c7baff36e43ab96928a402f00a19/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="64d0a198be05c7baff36e43ab96928a402f00a19" Really fix fft2 regression. #9740 Rewrite `take` more aggressively for fusion. Add some more explicit strictness to `unsafeTake` and `unsafeDrop` that seems to help code size and allocation just a drop in some nofib tests. They were not previously strict in their numerical arguments, but always called in contexts where those had been forced; it didn't make a difference in simple test cases, but made a small difference for nofib. See #9740. Differential Revision: https://phabricator.haskell.org/D394 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9740#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler