#13344: Core string literal patch regresses compiler performance considerably -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by gridaphobe): * cc: gridaphobe (added) Comment: Replying to [comment:3 bgamari]:
I asked David look into this a few weeks back; he says that he may have seen duplicated strings in Core.
`T5837` looks like it would be a good testcase to evaluate this issue with.
FWIW, I noticed this weekend that Phab:D2605 did not enable CSE on the floated literals. I think the latest 1% decrease in binary sizes in my Phab:D1259 is largely due to enabling CSE on the floated strings. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13344#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler