[Bug fortran/56637] Bad result on max(1,shiftr(j,1))

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56637

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2013-03-16 21:36:54 UTC ---
> I don't mean to be argumentative, but I would like to ask:
> Would an index out of bounds explain why single stepping over the statement
> make it work, and would it explain that a higher level of optimization works?

Absolutely: all the errors mentioned by Thomas give behaviors sensitive to the
memory layout! However if you compile with -fcheck=bounds, out of bounds
error(s) should be detected. Did you check that you pass the right arguments
(position, type, kind, ...) to the procedures in the libraries you are using?