[GHC] #8901: (very) bad inline heuristics

[GHC]

#8901: (very) bad inline heuristics
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        Reporter:  heisenbug         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.7
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by heisenbug):

 Here come the latest stats (with today's GHC HEAD) :
 {{{
 $ ls -l ./libraries/time/dist-install/build/Data/Time/Format.*o
 -rw-r--r-- 1 ggreif lb40 482568 Jan 12 16:24 ./libraries/time/dist-
 install/build/Data/Time/Format.dyn_o
 -rw-r--r-- 1 ggreif lb40 514776 Jan 12 16:24 ./libraries/time/dist-
 install/build/Data/Time/Format.o

 $ wc -l ./libraries/time/lib/Data/Time/Format.hs
 254 ./libraries/time/lib/Data/Time/Format.hs
 $ strip ./libraries/time/dist-install/build/Data/Time/Format.*o
 $ ls -l ./libraries/time/dist-install/build/Data/Time/Format.*o
 -rw-r--r-- 1 ggreif lb40 201512 Jan 12 17:26 ./libraries/time/dist-
 install/build/Data/Time/Format.dyn_o
 -rw-r--r-- 1 ggreif lb40 187712 Jan 12 17:26 ./libraries/time/dist-
 install/build/Data/Time/Format.o

 $ ghc -e "187712/254"
 739.0236220472441
 }}}

 As you can see a single line of Format.hs gets compiled to 739 stripped
 bytes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8901#comment:12>
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