#9326: Minor change to list comprehension structure leads to poor performance -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Differential Revisions: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- Changes (by slyfox): * cc: slyfox (added) Comment: In 'comdspeed' one more rule did fire (to specialze .find on Ints): {{{ "SPEC find [(Int, Int)]" [ALWAYS] forall @ a3_a2Tz $dOrd_s2U0. find $dOrd_s2U0 = $sfind }}}. It's seen in core comparison when use '''-ddump-simp -dsuppress-all'''. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9326#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler