#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: 8.4.1 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): I took a stab at bisecting this myself, the problem however is that I'm getting too many false positives, even when cleaning thoroughly and starting with as clean a slate as possible, and when I do that, build times become prohibitive, so I gave up after a few night-long attempts. So I will now take a different route, trying to isolate the problem further on current GHC HEAD, see if I can pin it down. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14519#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler