#13193: Integer (gmp) performance regression? -------------------------------------+------------------------------------- Reporter: j.waldmann | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: newcomer Operating System: Linux | Architecture: x86_64 Type of failure: Runtime | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): Aha! the source code I was looking at changed since the version of the object code I was examining. So disregard the second point above. Phab:D2278 is new in HEAD; the old implementation was basically `x - y = x + (-y)`, which has to allocate `-y`. I think the code could still be made somewhat shorter/better, but that would be a relatively minor improvement. j.waldmann, could you test with a perf build of HEAD? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13193#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler