Re: [GHC] #490: object code blow up by minor source code change

#490: object code blow up by minor source code change
-----------------------+----------------------------------------------------
  Reporter:  c_maeder  |          Owner:  simonpj
      Type:  bug       |         Status:  new    
  Priority:  normal    |      Milestone:         
 Component:  Compiler  |        Version:  6.4.1  
  Severity:  normal    |     Resolution:  None   
  Keywords:            |             Os:  Unknown
Difficulty:  Unknown   |   Architecture:  Unknown
-----------------------+----------------------------------------------------
Comment (by simonpj):

 Here are some follow-ups from Christian:

 Thanks, for looking into it. For our code bloat, related to the
 ShATermConvertible instances, there are no associative operations. I've
 included the basic class and a few instances that pose no problem until
 very late in our final big binary (with many more instances).

 Currently, I simply set "-fvia-C -O0" in parts of our code and hope that
 -optc-O1 helps a bit.

 Cheers Christian

 P.S. I've changed infixl to infixr
 {{{
   infixr 6 <>
   infixr 6 <+>
   infixr 5 $$, $+$
 }}}

  The numbers are much better with infixr:
 {{{
 Linking ...

 real    5m30.666s
 user    4m56.950s
 sys     0m9.262s
 maeder@turing:~/haskell/examples> ll a.out HasCASL/PrintLe.o
 -rwxr-xr-x  1 maeder wimi 4812378 2006-01-26 20:01 a.out
 -rw-r--r--  1 maeder wimi  139828 2006-01-26 19:58 HasCASL/PrintLe.o
 }}}


 ------------------


 The code bloat goes away again when I now change back to infixl!
 Is this now a better patch for HughesPJ.hs?
 {{{
 Linking ...

 real    5m18.860s
 user    4m56.663s
 sys     0m9.168s
 maeder@turing:~/haskell/examples> ll a.out HasCASL/PrintLe.o
 -rwxr-xr-x  1 maeder wimi 4808498 2006-01-26 20:23 a.out
 -rw-r--r--  1 maeder wimi  140820 2006-01-26 20:21 HasCASL/PrintLe.o
 }}}

 Christian Maeder wrote:
 > When I also swap the corresponding equations the code bloat comes back:

 {{{
 > above_ p _ Empty = p
 > above_ Empty _ q = q
 >
 > beside_ p _ Empty = p
 > beside_ Empty _ q = q
 >
 >
 > Linking ...
 >
 > real    7m10.727s
 > user    6m25.456s
 > sys     0m10.698s
 > maeder@turing:~/haskell/examples> ll a.out HasCASL/PrintLe.o
 > -rwxr-xr-x  1 maeder wimi 6213885 2006-01-26 20:11 a.out
 > -rw-r--r--  1 maeder wimi 1762784 2006-01-26 20:09 HasCASL/PrintLe.o
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/490>
GHC <http://www.haskell.org/ghc/>
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