#10124: Simple case analyses generate too many branches -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #6135, | Differential Revisions: #9661,#10137 | -------------------------------------+------------------------------------- Comment (by nomeata):
It might be a different matter with concat (replicate 100000000 ['\001'..'z']).
Eh, that’s of course the code I intended, thanks for noticing! ... unfortunately, not even that code gets faster: {{{ $ python -m timeit -s 'import os' 'os.system("./IsSpace-before")' 10 loops, best of 3: 4.9 sec per loop $ python -m timeit -s 'import os' 'os.system("./IsSpace-after")' 10 loops, best of 3: 4.9 sec per loop }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10124#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler