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Subject: [Bug fortran/46166] optimization and/or removing an if(.false.) statement leads to bad results
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46166

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2010-10-25 18:45:18 UTC ---
1) Remove the Tabs from your source.
(2) Compile with  -O2 -Wall -Wuninitialized -fcheck=all.