[Bug middle-end/34400] [4.3 regression] bad interaction between DF and SJLJ exceptions

["zadeck at naturalbridge dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #36 from zadeck at naturalbridge dot com  2007-12-17 16:33 -------
Subject: Re:  [4.3 regression] bad interaction between
 DF and SJLJ exceptions

ludovic at ludovic-brenta dot org wrote:
> ------- Comment #35 from ludovic at ludovic-brenta dot org  2007-12-17 16:16 -------
> Created an attachment (id=14784)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14784&action=view)
>  --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14784&action=view)
> Results of gnat1 -ftime-report [...] g-catiio.adb with SJLJ exceptions
>
> $ time ../../gnat1 -ftime-report -dumpbase g-catiio.adb -O2 -W -Wall -g -gnatpg
> -mtune=generic -gnatO g-catiio.o g-catiio.adb > /tmp/pr34400-time-report.txt
> 2>&1
>
> real    0m54.039s
> user    0m53.647s
> sys     0m0.332s
>
> With df_hack2, df_hack3 and df_double_queue_worklist applied.
>
>
>   
I am looking at this time report and i do not see anything thing that
looks like df is taking an inordinate amount of time.  i could be
missing something. 

but it looks like there are a lot of passes that are eating big chunks
of time here.  At this point halving the amount of time that df takes is
going to give you a few percent. 

Kenny


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34400