[Bug fortran/49103] [4.6/4.7 Regression] local variables exchange values / wrong code with -O3

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49103

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-05-21 
21:21:09 UTC ---
Created attachment 24322
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24322
reduced test