#14519: Exponential runtime performance regression in GHC 8.2 + Data.Text.Lazy + Text.RE.TDFA -------------------------------------+------------------------------------- Reporter: ntc2 | Owner: tdammers Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime | Test Case: performance bug | https://github.com/ntc2/ghc-8.2.1 | -regex-lazy-text- | bug/tree/07b7bb32c6e90e8f2d2eada4b59943f37e632d53 Blocked By: | Blocking: Related Tickets: #13745, #14564 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers):
Does compiling with -fno-worker-wrapper fix it?
Haven't tried this one yet; `-fno-enable-rewrite-rules` seems to fix it, the other optimization flags listed as "implied by -O" on [https://downloads.haskell.org/~ghc/7.8.2/docs/html/users_guide/flag- reference.html#options-f-compact] don't seem to make a difference. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14519#comment:33 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler