------- Comment #2 from pinskia at gcc dot gnu dot org 2008-05-07 09:43 -------
This is a normal issue with the unitialized warnings. See PR 5035. Basically
to get this warning correct for this case, you need conditional PHIs which we
don't have currently. And I don't know of any compiler that does.
Basically the code looks like:
if (a)
set b
for(...)
for(...)
if (a)
use b
Unswitching the loops will help somewhat as then you can then jump thread.
Thanks,
Andrew Pinski
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
OtherBugsDependingO| |24639
nThis| |
Severity|normal |enhancement
Keywords|diagnostic |
Known to fail|4.2.3 4.4.0 |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36168
