[Bug middle-end/34400] [4.3 regression] gnat1 takes too long to compile g-catiio.adb with SJLJ exceptions

["ludovic at ludovic-brenta dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #4 from ludovic at ludovic-brenta dot org  2007-12-09 20:48 -------
First, read http://gcc.gnu.org/ml/gcc/2006-10/msg00303.html for a
little background information on ZCX and SJLJ in Ada.

Steps to reproduce:

- bootstrap with ada enabled (i.e. ../gcc/configure
  --enable-languages=ada)

$ rm gcc/ada/rts/g-catiio.{ali,o}
$ cd gcc/ada/rts
$ time ../../gnat1 -quiet -dumpbase g-catiio.adb -O2 -W -Wall -g -gnatpg
-mtune=generic -gnatO g-catiio.o g-catiio.adb

This will show you a reference time building the ZCX version.  

In my case (2.0 Ghz AMD Turion 64):
real    0m4.238s
user    0m3.664s
sys     0m0.060s

Now, edit gcc/ada/rts/system.ads; change ZCX_By_Default from True to
False.  This switches the run-time library to SJLJ.  Then, compile
again:

$ rm gcc/ada/rts/g-catiio.{ali,o}
$ cd gcc/ada/rts
$ time ../../gnat1 -quiet -dumpbase g-catiio.adb -O2 -W -Wall -g -gnatpg
-mtune=generic -gnatO g-catiio.o g-catiio.adb

In my case:
real    275m44.310s
user    271m41.839s
sys     0m9.585s


-- 

ludovic at ludovic-brenta dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |UNCONFIRMED


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