[Bug fortran/45396] Apply front-end pass also for arrays

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2010-08-24 10:29 -------
Stupid example: Change either a == a to "a /= a" and .true. to .false. -- or
ANY to ALL. Otherwise the example does not make sense (even though it is
valid).


If one is there, one could also optimize the following:

logical :: ll
if (ALL ( [.false. , ll])) call unreachable()
end

As the single .false. makes the whole expression .false.; similarly for ANY and
.true. and for PRODUCT with an element of value 0 (though, one needs to take
case of DIM is present). 

Currently, the middle end optimizes this - though there might be cases when an
early FE optimization could help - e.g. if DIM is present as then a RTL call
could happen.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45396